EXJ_8E99 jeep xj service manual

7/29/2019 EXJ_8E99 jeep xj service manual

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INSTRUMENT PANEL SYSTEMS

CONTENTS

page page

GENERAL INFORMATIONGAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . . 3INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . 2INSTRUMENT PANEL . . . . . . . . . . . . . . . . . . . . 2INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . 3

DESCRIPTION AND OPERATIONAIRBAG INDICATOR LAMP . . . . . . . . . . . . . . . . 6ANTI-LOCK BRAKE SYSTEM LAMP . . . . . . . . . . 6BRAKE WARNING LAMP . . . . . . . . . . . . . . . . . . 6

CHECK GAUGES LAMP . . . . . . . . . . . . . . . . . . . 6CIGAR LIGHTER AND POWER OUTLET . . . . . . 6CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . . 6CLUSTER ILLUMINATION LAMP . . . . . . . . . . . . 7

COOLANT TEMPERATURE GAUGE . . . . . . . . . . 4COOLANT TEMPERATURE WARNING LAMP . . 7CRUISE-ON INDICATOR LAMP . . . . . . . . . . . . . 7FOUR-WHEEL DRIVE INDICATOR LAMP . . . . . . 7

FUEL GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . 4HEADLAMP HIGH BEAM INDICATOR LAMP . . . 7LOW FUEL WARNING LAMP . . . . . . . . . . . . . . . 8LOW OIL PRESSURE WARNING LAMP . . . . . . . 8

LOW WASHER FLUID WARNING LAMP . . . . . . . 8

MALFUNCTION INDICATOR LAMP . . . . . . . . . . 8ODOMETER AND TRIP ODOMETER . . . . . . . . . 4OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . . 5SEAT BELT REMINDER LAMP . . . . . . . . . . . . . . 9

SPEEDOMETER . . . . . . . . . . . . . . . . . . . . . . . . 5TACHOMETER . . . . . . . . . . . . . . . . . . . . . . . . . . 5TURN SIGNAL INDICATOR LAMP . . . . . . . . . . . 9UPSHIFT INDICATOR LAMP . . . . . . . . . . . . . . . 9

VOLTAGE WARNING LAMP . . . . . . . . . . . . . . . . 9VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

DIAGNOSIS AND TESTINGAIRBAG INDICATOR LAMP . . . . . . . . . . . . . . . 14

ANTI-LOCK BRAKE SYSTEM LAMP . . . . . . . . . 14

BRAKE WARNING LAMP . . . . . . . . . . . . . . . . . 15CHECK GAUGES LAMP . . . . . . . . . . . . . . . . . . 16CIGAR LIGHTER AND POWER OUTLET . . . . . 16

CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . 16

CLUSTER ILLUMINATION LAMP . . . . . . . . . . . 17COOLANT TEMPERATURE GAUGE . . . . . . . . . 10

COOLANT TEMPERATURE WARNING LAMP . . 18CRUISE-ON INDICATOR LAMP . . . . . . . . . . . . 18FOUR-WHEEL DRIVE INDICATOR LAMP . . . . . 18FUEL GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . 13HEADLAMP HIGH BEAM INDICATOR LAMP . . 19

INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . 9LOW FUEL WARNING LAMP . . . . . . . . . . . . . . 20LOW OIL PRESSURE WARNING LAMP . . . . . . 20LOW WASHER FLUID WARNING LAMP . . . . . . 20

MALFUNCTION INDICATOR LAMP . . . . . . . . . . 21ODOMETER AND TRIP ODOMETER . . . . . . . . 13OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . 13SEAT BELT REMINDER LAMP . . . . . . . . . . . . . 21

SPEEDOMETER . . . . . . . . . . . . . . . . . . . . . . . 14TACHOMETER . . . . . . . . . . . . . . . . . . . . . . . . . 14TURN SIGNAL INDICATOR LAMP . . . . . . . . . . 21UPSHIFT INDICATOR LAMP . . . . . . . . . . . . . . 22

VOLTAGE WARNING LAMP . . . . . . . . . . . . . . . 22VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . 14

REMOVAL AND INSTALLATIONACCESSORY SWITCH BEZEL . . . . . . . . . . . . . 24

CENTER SUPPORT BRACKET . . . . . . . . . . . . 32

CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . 24CLUSTER BEZEL . . . . . . . . . . . . . . . . . . . . . . . 25CLUSTER BULB . . . . . . . . . . . . . . . . . . . . . . . . 28CLUSTER COMPONENTS . . . . . . . . . . . . . . . . 27

GLOVE BOX COMPONENTS . . . . . . . . . . . . . . 30GLOVE BOX LAMP AND SWITCH . . . . . . . . . . 29GLOVE BOX LATCH STRIKER . . . . . . . . . . . . . 31GLOVE BOX . . . . . . . . . . . . . . . . . . . . . . . . . . 29

HEADLAMP SWITCH . . . . . . . . . . . . . . . . . . . . 25INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . 26INSTRUMENT PANEL ASSEMBLY . . . . . . . . . . 33INSTRUMENT PANEL CENTER BEZEL . . . . . . 23

INSTRUMENT PANEL END CAP . . . . . . . . . . . 31

INSTRUMENT PANEL TOP COVER . . . . . . . . . 28JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . 32KNEE BLOCKER . . . . . . . . . . . . . . . . . . . . . . . 23

STEERING COLUMN OPENING COVER . . . . . 22

GENERAL INFORMATION

INTRODUCTION

This group is responsible for covering the vehicle

i n s t r u m en t p a n e l. H o w e ve r, beca u s e t h e i n s t r u m en t

panel serves as the command center of the vehicle, i t

i s a v er y com pl ex u n it . Th e i n st r u m en t p a n el i s

designed to house the controls and monitors for stan-

d a r d a n d op t i on a l p ow e r t r a i n s , cl i ma t e con t r o l s y s -

t em s, a u di o s ys tem s, lig ht in g s ys tem s, s a fet y

s y st e ms , a n d m a n y ot h er com f or t or con v en i en ce

i t e m s . I t i s a l s o d e s i g n e d s o t h a t a l l o f t h e c o n t r o l s

a n d m on i t or s ca n b e s a f e ly r ea c h ed a n d v iew e d b y

XJ INSTRUMENT PANEL SYSTEMS 8E - 1


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the vehicle operator, while sti l l al lowing relative ease

of access to these i tems for service.

Complete service information coverage for all of the

s y s t em s a n d com p on e n t s h ou s ed i n t h e i n s t r u me n t

panel in this section of the service manual would not

be p r a c t i c a l . I t w o u l d r e s u l t i n a g r e a t d e a l o f d u p l i -

cation and make this group too large for the informa-t i on t o be e a s i ly a c ce ss ed a n d u s ed . Th e r ef or e , t h e

i n f o r m a t i o n f o u n d i n t h i s g r o u p h a s be e n l i m i t e d a s

follows:

General Information - Covers non-electrical com-

p on en t s a n d f ea t u r e s o f t h e i n st r u m en t p a n el t h a t

a r e n o t r e l a t e d t o o t h e r s y s t e m s .

De s c r i p t i o n a n d O p e r a t i o n - C o v e r s g a u g e s a n d

t heir sen din g u nit s, w a r nin g la m ps a n d t heir

s w i t ch e s, a n d i n s t r u m en t p a n e l i l l um i n a t i on l a m p s .

Dia gnosis a nd Testing - Covers gauges a nd their

s en d in g u n it s , w a r n i n g l a m ps a n d t h ei r s w i t ch es ,

a n d i n s t r u me n t p a n e l i l lu m i n a t i on l a m p s.

R e mov a l a n d I n s t a l l a t i o n - C o v er s com p on e n t si n s t a l l e d o n o r i n t h e i n s t r u m e n t p a n e l t h a t r e q u i r e

removal for diagnosis or service of instrument panel

components covered in this group.

Fo r m or e i n for m a t i o n on com p on e n t s or s y s t em s

not covered above, r efer to t he proper group in this

m a n u a l . I f y o u a r e u n c e r t a i n a s t o t h e p r o p e r g r o u p ,

r ef er t o t h e C om pon en t a n d S y st em I n dex a t t h e

b a ck of t h i s m a n u a l . R ef er t o G r o up 8W - Wi r in g

Di a g r a m s f or com p le t e ci r cu i t d e scr i pt i on s a n d d i a -

g r a m s .

NOTE: This group covers both Left-Hand Drive

(LHD) and Right-Hand Drive (RHD) versions of thismodel. Whenever required and feasible, the RHDversions of affected vehicle components have beenconstructed as mirror-image of the LHD versions.While most of the illustrations used in this group

represent only the LHD version, the diagnostic andservice procedures outlined can generally beapplied to either version. Exceptions to this rulehave been clearly identified as LHD or RHD, if a

special illustration or procedure is required.

INSTRUMENT PANEL

This instrument panel uses a full-width structuralp l a s t i c f o u n d a t i o n a s i t s p r i m a r y s u p p o r t . W h e n t h e

two primary molded plastic components of this struc-

ture are vibration welded together they provide supe-

r i o r i n s t r u m e n t p a n e l s t i f f n e s s a n d i n t e g r i t y t o h e l p

r ed uce b uz zes , s q uea k s, a n d r a t t les ev en on t h e

bumpiest roads.

This type of construction also provides improved

e ne rg y a b s or pt i on w h i ch , i n con ju n ct i on w i t h t h e

dual airbag modules and seat belts, helps to improve

occupant protection. This founda tion structure also

s e r v e s a s t h e d u c t i n g f o r t h e h e a t i n g a n d a i r c o n d i -

t i on i n g s y s t em p a n e l o u t l et s , w h i ch g r ea t l y r e du ce s

t h e n u m ber of com p on e n t s u s ed ov er con v en t i on a l

instrument panel construction.

M od u l a r i n s t r u m en t p a n e l c on s t r u ct i on a l l ow s a l l

of t h e g a u g e s a n d con t r o ls t o be s er v ice d f r o m t h e

f r on t of t h e p a n el . I n a d d i t ion , m os t of t h e i n st r u -

m e n t p a n e l e le ct r i ca l com p on e n t s ca n be a c ce ss edwithout complete instrument panel removal . If neces-

s a r y , t h e i n s t r u m e n t p a n e l c a n be r e m o v e d f r o m t h e

vehicle as an assembly.

Removal of the steering column opening cover and

knee blocker provides access t o t he steering column

m ou n t s , t h e s t e e r in g col u m n w i r in g , t h e h e a d l a m p

switch, the electronic combination flasher, and much

of the instrument panel wiring. Removal of the glove

box provides access to the heating and air condition-

i n g e le ct r i ca l a n d v a cu u m h a r n es se s, t h e b low e r

m ot or r el a y, t h e r a d i o a n t en n a coa x ia l ca b l e, t h e

l o w e r p a s s e n g e r s i d e a i r ba g m o u n t s , a n d a d d i t i o n a l

i n s t r u me n t p a n e l w i r in g .R em ov a l of t h e i ns t ru m en t pa n el cen t er b ez el

a l l o w s a c c e s s t o t h e r a d i o , t h e h e a t i n g a n d a i r c o n d i -

t i on i n g con t r o ls , t h e a c ce ss or y s w i t ch e s, t h e ci g a r

l ig h t e r, a n d t h e a c ce ss or y p ow e r ou t l et . R em ov a l of

t h e i n st r u m en t cl us t er b ez el a l l ow s a c ce ss t o t h e

instrument cluster. Removal of t he cluster a ssembly

a l l o w s a c c e s s t o t h e c l u s t e r i l l u m i n a t i o n a n d i n d i c a -

t or l a m p b u l bs , a n d m or e o f t h e i n st r u m en t p a n el

wiring.

R e mov a l of t h e i n s t r u m en t p a n e l t op cov er a l l ow s

a c ce ss t o t h e u p pe r p a s s en g er s i de a i r ba g m ou n t s .

I n s t r u m en t p a n e l r e m ov a l i s r e q u ir e d f or s er v i ce of

most internal components of the heating and air con-ditioning housing.

INSTRUMENT CLUSTER

Tw o ba s i c i n s t r u m en t cl u st e r s a r e of f er e d on t h i s

model: low-line or high-line. Both clusters are electro-

mechanical units that uti l ize integrated circuitry and

information carried on the Chrysler Coll ision Detec-

tion (CCD) data bus network for control of al l gauges

and many of the indicator lamps. These clusters also

incorporate a vacuum fluorescent display tube for t he

d i g it a l od om e t er /t r i p od om e t er d i s pl a y f u n ct i on s .

Some variations of each cluster exist due to optional

equipment and regulatory requirements.

The low-line cluster includes t he following an alog

gauges:

Fu e l g a u g e

Speedometer.

This cluster includes provisions for the following

indicator lamps:

Airbag indicator lamp

Anti-lock brake system lamp

B r a k e w a r n i n g l a m p

C o o l a n t t e m p e r a t u r e w a r n i n g l a m p

8E - 2 INSTRUMENT PANEL SYSTEMS XJ

GENERAL INFORMATION (Continued)


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Cruise-on indicat or la mp

Four-wheel drive (P art Time an d/or Full Time)

indicator lamps

H e a d l a m p h i g h be a m i n d i c a t o r l a m p

L o w o i l p r e s s u r e w a r n i n g l a m p

L o w w a s h e r f l u i d w a r n i n g l a m p

Malfunction indicator (Check Engine) lamp Se a t be l t r e m i n d e r l a m p

Turn signal indicat or lamps

U p s h i ft i n d ica t or l a m p (m a n u a l t r a n s m i s s ion )

Voltage warning lamp.

The high-line cluster replaces some of the indicator

l a m ps f ou n d i n t h e l ow -l in e cl us t er w i t h a n a l og

gauges. The high-line cluster includes t he following

a n a l og g a u g e s:

C o ol a n t t e m pe r a t u r e g a u g e

Fu e l g a u g e

Oil pressure gauge

Speedometer

Ta chomet er Voltmeter.

Th e h i gh -l in e cl us t er a l s o a d d s a ch eck g a u g es

l a m p a n d a l o w f u e l w a r n i n g l a m p t o t h e r e m a i n i n g

indicator lamps found in the low-line cluster.

B o t h i n s t r u m en t cl u st e r s f e a t u r e c ir cu i t r y t h a t h a s

a s el f-d i a g n os t i c a ct u a t or t e s t ca p a bi l it y, w h i ch w i l l

t e s t e a ch of t h e C C D bu s m e ss a g e -con t r o ll ed f u n c-

t i o n s o f t h e c l u s t e r by l i g h t i n g t h e a p p r o p r i a t e i n d i -

ca t o r l a m ps a n d p os it i on i ng t h e g a u g e n ee dl es a t

several predetermined locat ions on the gauge faces in

a prescribed sequence. For more informa tion on this

f u nct i on , s ee I n s t r um en t C l us t er i n t h e D i a g n os is

an d Testing section of this group.Th e i n s t r u m en t cl u st e r ci r cu i t r y a l s o i n t eg r a t e s a

ch i me t on e g en er a t o r a n d a t i m er ci r cu i t . Th es e

i t e m s r e p l a c e t h e c h i m e o r bu z z e r m o d u l e , a n d t h e

s ep a r a t e t i m er ci r cu i t f or t h e r e a r w i n d ow d e fog g er

system. Refer to G roup 8U - Chime/B uzzer War ning

Sy s t e m s o r Gr o u p 8 N - E l e c t r i c a l l y H e a t e d Sy s t e m s

for more information on these cluster circuitry func-

tions.

The instrument clusters for this model are serviced

only as complete units. If a cluster gauge or the clus-

ter circuit board are faulty, the entire cluster must be

r e pl a ce d . Th e cl u s t er l en s , t h e h ood a n d m a s k , t h e

rear housing cover and the odometer reset knob boot

are available for service. Also, the individual cluster

lamp bulbs and bulb holders can be serviced.

GAUGE

Wi t h t h e i g n i t i on s w i t ch i n t h e O n o r S t a r t p os i -

t i on s , v o lt a g e i s s u pp li ed t o a l l g a u g es t h r o ug h t h e

instrument cluster electronic circuit boar d. With the

ignition switch in the Off position, voltage is not sup-

p li ed t o t h e g a u g es . Th e g a u g es d o n ot a c cu r a t e ly

i n d ica t e a n y v eh i cl e con d i t i on u n l es s t h e i g n it i on

s w i t c h i s i n t h e O n o r St a r t p o s i t i o n s .

All gauges, except the odometer, are air core mag-

n et i c u n it s . Tw o f ix ed e le ct r om a g n et i c coi ls a r e

located within the gauge. These coils are wrapped at

r i g h t a n g l e s t o e a c h o t h e r a r o u n d a m o v a bl e p e r m a -

n en t m a g n et . Th e m ov a b le m a g n et i s s u sp en d edwithin the coils on one end of a shaft . The gauge nee-

d l e i s a t t a c h e d t o t h e o t h e r e n d o f t h e s h a f t .

On e of t h e coils h a s a fixed cu rr en t f low in g

t h r ou gh i t t o m a i nt a i n a con st a n t m a g net ic f iel d

s t ren gt h . C u rr en t f low t h r ou gh t h e s econ d coi l

c h a n g e s , w h i c h c a u s e s c h a n g e s i n i t s m a g n e t i c f i e l d

strength. The current flowing through the second coil

i s ch a n g e d by t h e i n s t r u m en t cl u st e r e le ct r o n ic ci r -

cu it r y i n r es pon se t o m es sa g es r ecei ved on t h e

Chrysler Coll ision Detection (CCD ) data bus netw ork.

The ga uge needle moves as the movable perman ent

m a g n e t a l i g n s i t s e l f t o t h e c h a n g i n g m a g n e t i c f i e l d s

created around i t by the electromagnets. The instru-ment cluster circuitry is programmed to move al l of

the ga uge needles back to t he low end of t heir respec-

t i v e s c a l e s a f t e r t h e i g n i t i o n s w i t c h i s t u r n e d t o t h e

Off position.

INDICATOR LAMP

Indicator lamps are located in the instrument clus-

t e r a n d a r e s er v ed b y t h e c lu s t er ci r cu it b oa r d a n d

con n ect or s. M a n y of t h e i nd ica t or l a mps i n t h e

i n s t r u m en t cl u st e r a r e con t r o ll ed by t h e i n s t r u m en t

cl u st e r ci r cu i t r y i n r e sp on s e t o m e ss a g e s r e ce iv ed

over the Chrysler Coll ision Detection (CCD) data bus

network.Th e a n t i -l ock br a k e s y s t em l a m p , br a k e w a r n i n g

l a m p , f ou r -w h e e l d r i ve i n d ica t or l a m p s, h e a d l a m p

h i g h be a m i n d i c a t o r l a m p , l o w w a s h e r f l u i d w a r n i n g

lamp, seat belt reminder lamp driver seat belt switch

i npu t , a n d t u rn s ig na l i nd ica t or l a m ps a r e h a r d-

w i r e d . Th e i n s t r u m en t cl u s t er ci r cu i t r y u s es C C D

data bus messages from the Powertrain Control Mod-

ule (PCM) an d Airbag Control Module (ACM) to con-

t r o l a l l o f t h e r e m a i n i n g i n d i c a t o r l a m p s .

JUNCTION BLOCK

Th e ju n ct i on bl ock i s m ou n t e d on t h e r i g h t cow l

s id e i n n er p a n el u n d er t h e i n st r u m en t p a n el . I t i s

concealed behind the right cowl side trim panel . The

ju n ct i on b lock s er v es t o s im pl if y a n d ce nt r a l iz e

numerous electrical components.

The junction block combines the functions previ-

ou s ly p r ov i de d by a s ep a r a t e f u se bl ock m od u l e a n d

r e la y ce n t er. I t con t a i n s f u s es , ci r cu i t br ea k e r s a n d

r el a ys . I t a l so el im in a t es t h e n eed f or n um er ou s

splice connections a nd serves in place of a bulkhead

connector between many of the engine compartment,

i n s t r u m en t p a n e l, a n d bod y w i r e h a r n e ss es .




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T h e r i g h t c o w l s i d e t r i m p a n e l h a s a s n a p - f i t f u s e

a c ce ss cov er t h a t ca n be r e m ov ed f or s er v ice of t h e

ju n ct i on bl ock f u s es . A f u s e p u l l er a n d s p a r e f u se

h ol de rs a r e l oca t e d on t h e b a ck of t h e f us e a c ces s

pa n el. Th e r ig ht cow l s id e t r im pa n el m us t b e

removed to access the relays in the junction block.

The junction block can not be repaired a nd, i f fa ultyo r d a m a g e d , i t m u s t be r e p l a c e d .

DESCRIPTION AND OPERATION

COOLANT TEMP ERATURE GAUGE

The coolant temperature gauge gives an indication

of t h e e n gi n e cool a n t t e m pe r a t u r e . Th e i n s t r u m en t

cluster circuitry controls t he gauge pointer position.

Th e i n st r u m en t cl us t er ci r cu it r y ca l cu la t e s t h e

proper gauge pointer position based upon an engine

coolant temperature message received from the Pow-

ertrain Control Module (PCM) on the Chrysler Coll i-sion Detection (CCD) data bus.

Th e P C M u s es a n i n pu t f r om t h e e n g in e c ool a n t

t e mp er a t u r e s en s or a n d i n t er n a l p rog r a m m in g t o

d e ci d e w h a t e n gi n e c ool a n t t e m pe r a t u r e m e ss a g e i s

required. The PCM then sends the proper message to

t h e i n s t r u m e n t c l u s t e r o n t h e C C D d a t a bu s .

I f t h e P C M m e ss a g e i n d i ca t e s t h a t cool a n t t e m pe r-

ature is high, the instrument cluster circuitry moves

t h e g a u g e n e e d l e i n t o t h e be g i n n i n g o f t h e r e d z o n e

o n t h e g a u g e f a c e , t u r n s o n t h e C h e c k Ga u g e s l a m p ,

a n d g e n e r a t e s a s i n g l e c h i m e t o n e . I f t h e P C M m e s -

s a g e i n d ica t e s t h a t cool a n t t e m pe r a t u r e i s cr i t i ca l ,

t h e i n st r u m en t cl us t er ci r cu it r y m ov es t h e g a u g en e e d l e t o t h e s t o p a t t h e e n d o f t h e r e d z o n e o n t h e

gauge face.

The engine coolant temperature sensor is instal led

i n a t h r e a d e d h o l e t h a t p e n e t r a t e s a c o o l a n t p a s s a g e

of t h e e ng in e. I t i s a t h er m is t or -t y pe s en s or t h a t

ch a n ges i t s i nt er n a l r es is t a n ce w i t h ch a n ges i n

engine coolan t tempera ture. Refer t o G roup 14 - Fuel

S y s t em s f or m or e i n f or m a t i on on t h e P C M a n d t h e

coolant temperature sensor.

FUEL GAUGE

T h e f u e l g a u g e g i v e s a n i n d i c a t i o n o f t h e l e v e l o f

fuel in th e fuel ta nk. The instrument cluster circuitrycontrols t he gauge pointer position. The instrument

cluster circuitry calculates the proper gauge pointer

p os i t ion ba s e d u p on a f u el l ev el m e ss a g e r e ce iv ed

f r om t h e P o w e r t r a i n C o n t r ol M od u l e (P C M ) on t h e

Chrysler Coll ision Detection (CCD) data bus.

T h e P C M u s e s a n i n p u t f r o m t h e f u e l g a u g e s e n d -

i n g u n i t a n d i n t er n a l p rog r a m m in g t o d e ci de w h a t

fuel level message is required. The PCM then sends

t h e p r op er m e ss a g e t o t h e i n s t r u me n t cl u st e r on t h e

C C D d a t a b u s. I f t h e v e hi cl e i s e q u ip pe d w i t h t h e

high-line instrument cluster, when the PCM message

indicates that the fuel level is below one-eighth of a

f u ll t a n k , t h e i n s t r u m en t cl u st e r ci r cu i t r y t u r n s on

t h e l ow f ue l w a r n in g l a m p a n d g en er a t e s a s in g le

chime tone.

The fuel ga uge sending unit is mounted t o the elec-

t r i c f u e l p u m p m o d u l e l o c a t e d i n s i d e t h e f u e l t a n k .

Th e s e n di n g u n i t h a s a f l oa t a t t a c h e d t o t h e e n d o f as w i n g -a r m . Th e f l oa t m ov es u p o r d ow n w i t h i n t h e

f uel t a n k a s t h e f uel l ev el ch a n ges . As t h e f loa t

m ov es , a n e le ct r i ca l con t a c t on t h e p iv ot e n d o f t h e

swing-arm wipes a cross a resistor coil , wh ich changes

the internal electrical resistance of the sending unit .

R ef er t o G r ou p 1 4 - Fu e l S y s t e m s f or m or e i n f or m a -

t i on o n t h e P C M a n d t h e f u el g a u g e s e n d in g u n i t s er -

vice procedures.

ODOMETER AND TRIP ODOMETER

Th e od om et e r a n d t h e t r i p od om et e r s h a r e t h e

s a m e v a c u u m f l u o r e s c e n t d i g i t a l d i s p l a y t u be i n t h e

instrument cluster circuit board. Each gives an indi-cation of the distance the vehicle has travelled. How-

ever, by depressing the reset knob on the face of the

instrument cluster, the display can be switched from

odometer to trip odometer. Depressing the reset knob

for longer than two seconds while in the trip odome-

t e r m od e w i ll r e se t t h e t r i p o d om e t er t o z e ro. Th e

odometer and trip odometer display values are based

on distance pulse messages received from the Power-

t r a i n C o n t r ol M od u l e (P C M ) on t h e C h r y s l er C o ll i-

sion Detection (CCD) data bus.

Th e P C M u s es a n i n pu t f r om t h e Ve h icl e Sp e ed

S e n sor (VS S ) a n d i n t er n a l p rog r a m m in g t o d eci de

w h a t d is t a n ce p ul se s ig n a l i s r eq u ir ed . Th e P C Mt h e n s en d s t h e p rop er m es sa g e t o t h e i n st r u m en t

cl us t er ci r cu it r y on t h e C C D d a t a b u s. Th e i n st r u -

ment cluster stores both the odometer and trip odom-

e t er d is t a n ce i n for m a t i on a n d d is pl a y s t h e p rop er

value based upon ignition key-on and trip odometer

reset knob inputs. The instr ument cluster a lso stores

the odometer display mode (odometer or trip odome-

t e r ) , a n d w i l l r e t u r n t o t h e m o d e t h a t w a s s e l e c t e d

prior to the ignition switch being turned off.

I f t h e i n s t r u m en t cl u s t er i s n o t r e ce iv i n g d i s t a n c e

i n f o r m a t i o n o n t h e C C D d a t a bu s w h e n t h e i g n i t i o n

switch is turned to the On position, the odometer dis-

p la y w i l l r e m a in b la n k . I f t h e i n st r u m en t cl us t er

does not receive a distance message on the CCD data

bu s a f t e r t h e i g n i t i o n s w i t c h h a s be e n t u r n e d t o t h e

O n p os it i on , t h e i n st r u m en t p a n el ci r cu it r y w i l l

i n ser t t h e l a s t n or m a l ly d i sp la y e d d is t a n ce i n t h e

odometer display. If the instrument cluster is receiv-

ing CCD messages, but cannot display odometer val-

u es d u e t o a n i n t er n a l e rr or, t h e od om et e r d i sp la y

w i l l be bl a n k .

The VSS is a hall-effect sensor that is instal led in

t h e t r a n s m i s s ion (t w o -w h e el d r i ve ) or t r a n s f e r ca s e




5/34

(four-wheel drive), and is driven by the output shaft

t h r o ug h a s pe ed om e t er p in i on g ea r . I n c or r e ct t i r e

size, incorrect axle ratio, a faulty or incorrect speed-

om e t er p in i on g ea r , o r a f a u l t y VSS ca n e a ch r e su l t

in inaccurate odometer readings. Refer to Group 14 -

Fu e l Sy s t e m s f o r m o r e i n f o r m a t i o n o n t h e P C M a n d

the VSS. Refer to G roup 21 - Tra nsmission for moreinformation on the speedometer pinion gear.

The odometer and trip odometer can also be used

to digital ly display a stored DTC. Refer to Group 25 -

E m i s s ion C o n t r ol Sy s t e m s f or m or e i n for m a t i o n on

DT C s a n d t h e i r r e t r i e v a l .

OIL PRESSURE GAUGE

T h e o i l p r e s s u r e g a u g e g i v e s a n i n d i c a t i o n o f t h e

engine oil pressure. The instrument cluster circuitry

controls t he gauge pointer position. The instrument

cluster circuitry calculates the proper gauge pointer

position based upon an engine oil pressure message

received from the Powertrain Control Module (PCM)on the Chrysler Coll ision Detection (CCD) data bus.

T h e P C M u s e s a n i n p u t f r o m t h e e n g i n e o i l p r e s -

s ur e s en sor a n d i nt er n a l pr og ra m m in g t o d eci de

w h a t e n gi n e o i l p r e ss u r e m e s s a g e i s r e q u ir e d . Th e

P C M t h en s en d s t h e p rop er m es s a g e t o t h e i n st r u -

m en t cl u st e r on t h e C C D d a t a b u s. I f t h e P C M m es -

sa ge in dica t es t ha t oil pressur e is low, t he

instrument cluster circuitry moves the gauge needle

t o be l o w t h e z e r o g r a d u a t i o n o n t h e g a u g e f a c e , a n d

t u r n s o n t h e C h e c k Ga u g e s l a m p .

Th e e n gi n e o i l p r es s u re s en s or i s i n s t a l l ed i n a

t h r ea d e d h ol e t h a t p en et r a t e s a n oi l p a s s a g e o f t h e

e n gi n e. Th e e n gi n e oi l p r es s u r e s e n s or con t a i n s af l ex ibl e d i a p h r a g m a n d a v a r i a bl e r e s i st o r coi l. Th e

d ia p hr a g m m ov es i n r es pon se t o ch a n ges i n t h e

engine oil pressure, which changes the internal elec-

t r i ca l r e si s t a n ce of t h e s en s or. R e fe r t o Gr o u p 1 4 -


the engine oil pressure sensor.

SPEEDOM ETER

The speedometer gives a n indicat ion of the current

vehicle speed. The instrument cluster circuitry con-

trols the gauge pointer position. The instrument clus-

t e r ci r cu it r y ca l cu la t e s t h e p rop er g a u g e p oi n t er

position based upon a vehicle speed message received

f r om t h e P o w e r t r a i n C o n t r ol M od u l e (P C M ) on t h e

Chrysler Coll ision Detection (CCD) data bus.

Th e P C M u s es a n i n pu t f r om t h e Ve h icl e S p ee d

S e n sor (VS S ) a n d i n t er n a l p rog r a m m in g t o d eci d e

w h a t v eh i cl e s p ee d m e s s a g e i s r e q u ir e d. Th e P C M

t h en s en d s t h e p rop er m es sa g e t o t h e i n st r u m en t

c l u s t e r o n t h e C C D d a t a bu s .

The VSS is a hall-effect sensor that is instal led in

t h e t r a n s m i s s ion (t w o -w h e e l d r i ve ) o r t r a n s f e r ca s e

(four-wheel drive), and is driven by the output shaft

t h r ou g h a s p ee d om e t er p in i on g ea r . I n c or r e ct t i r e

size, incorrect axle ratio, a faulty or incorrect speed-

om e t er p in i on g e a r, o r a f a u l t y VSS ca n e a ch r e su l t

i n i n a c cu r a t e s pe ed om e t er r e a d i n gs . R e fe r t o Gr o u p

14 - Fu e l Sy s t e m s f or m or e i n f or m a t i o n o n t h e P C M

a n d t h e VSS. R e fe r t o G r ou p 2 1 - Tr a n s m i s si on f or

more information on the speedometer pinion gear.

TACHOM ETER

Th e t a ch om e t er g i ve s a n i n d ica t i o n of t h e e n gi n e

speed in revolutions-per-minut e (RP M). The instr u-

m en t cl us t er ci r cu i t ry con t r ol s t h e g a u g e p oi n t er

position. The instrument cluster circuitry calculates

t h e p rop er g a u g e p oi n t er p os it i on b a s ed u pon a n

engine speed message received from the Powertrain

C on t r ol M od u le (P C M ) on t h e C h r y sl er C ol li si on

De t e ct i on (C C D) d a t a bu s .

T h e P C M u s e s a n i n p u t f r o m t h e c r a n k s h a f t p o s i -

t i on s en s or a n d i n t er n a l p rog r a m m in g t o ca l cu l a t e

w h a t e ng in e s pe ed m es sa g e i s r eq u ir ed . Th e P C Mt h e n s en d s t h e p rop er m es sa g e t o t h e i n st r u m en t

cluster on the CCD data bus. The crankshaft position

sensor is a ha ll-effect sensor inst al led near the rea r

o f t h e e n g i n e , w h e r e i t i s a i m e d a t t h e t r i g g e r w h e e l

a t t a c h e d t o t h e r e a r f l a n g e o f t h e c r a n k s h a f t .

R e f e r t o Gr o u p 1 4 - Fu e l Sy s t e m s f o r m o r e i n f o r -

m a t i on on t h e P C M . R ef er t o G r ou p 8 D - I g n it i on

Systems for more information on the crankshaft posi-

tion sensor.

VOLTMETER

The voltmeter gives an indication of the electrical

system volta ge. The instrument cluster circuitry con-trols t he ga uge pointer position. The inst rument clus-

t e r ci r cu i t ry ca l cu la t e s t h e p rop er g a u g e p oi n t er

p os it ion b a sed u pon a s ys t em v ol ta g e m es sa g e

received from the Powertrain Control Module (PCM)

on the Chrysler Coll ision Detection (CCD) data bus.

The PCM uses an input from the electrical system

a n d i n t er n a l p rog r a m m in g t o d eci d e w h a t s y st e m

v ol t a g e m es sa g e i s r eq u ir ed . Th e P C M t h e n s en d s

t h e p r op er m e ss a g e t o t h e i n s t r u m en t cl u s t er on t h e

C C D d a t a b us .

I f t h e P C M m es sa g e i nd ica t e s t h a t t h e ch a r gi ng

s y s t em h a s f a i l ed , t h e i n s t r u m en t cl u st e r ci r cu i t r y

m o v e s t h e g a u g e n e e d l e t o t h e 9 v o l t g r a d u a t i o n o n

t h e g a u g e f a c e, a n d t u r n s o n t h e C h e ck G a u g e s l a m p .

I f t h e P C M m e s s a g e i n d i c a t e s t h a t s y s t e m v o l t a g e i s

h i gh , t h e i n st r u m en t cl us t er ci r cu it r y m ov es t h e

g a u g e n e e d l e t o t h e 1 9 v o l t g r a d u a t i o n o n t h e g a u g e

f a c e , a n d t u r n s o n t h e C h e c k Ga u g e s l a m p .


m a t i o n o n t h e P C M . R e f e r t o G r o u p 8 C - C h a r g i n g

S y s t em s f or m or e i n for m a t i on on ch a r g in g s y st e m

components and diagnosis.


DESCRIPTION AND OPERATION (Continued)


6/34

AIRBAG INDICATOR LAMP

The airbag indicator lamp gives an indication when

t h e a i r ba g s y s t e m i s f a u l t y o r i n o p e r a t i v e . T h e l a m p

i s t u r n ed on by t h e i n s t r u m en t cl u st e r ci r cu i t r y f or

a b ou t s ev en s econ d s w h e n t h e i gn i t ion s w i t ch i s

t u r n ed t o t h e O n p os it i on a s a b u lb t e st . Af t er t h e

bu l b t e s t , t h e l a m p i s c o n t r o l l e d by t h e i n s t r u m e n tcluster circuitry based upon a message received from

t h e Ai r ba g C o nt r o l M od u l e (AC M ) o n t h e C h r y s l er

Coll ision Detection (CCD) data bus.

Th e A C M con t i n u a l l y m on i t or s t h e a i r ba g s y s t em

ci r cu i t s a n d s en s or s t o d e ci d e w h e t h e r t h e s y s t em i s

in good operating condition. The ACM then sends the

p rop er m es sa g e t o t h e i n st r u m en t cl us t er on t h e

C C D d a t a bu s t o t u r n t h e l a m p o n o r o f f . I f t h e A C M

s e n d s a l a m p - o n m e s s a g e a f t e r t h e bu l b t e s t , i t i n d i -

c a t e s t h a t t h e A C M h a s d e t e c t e d a s y s t e m m a l f u n c -

t i on a n d /or t h a t t h e a i rb a g s ys t em h a s b ecom e

inoperative.

Each t ime the instrument cluster circuitry receivesa l a m p -on m e ss a g e f r o m t h e AC M , i t w i l l l i g h t t h e

lamp for twelve seconds or the duration of the airbag

s ys t em m a lf un ct i on , w h i ch ev er i s l on ger. I f t h e

i n s t r u m en t cl u st e r r e ce iv es n o l a m p m e ss a g e s f r om

the ACM for more than five seconds, i t wil l l ight the

l a m p f or t w e l v e s e con d s or u n t i l a n o t h e r l a m p -of f

message from the ACM, whichever is longer.

Refer to Group 8M - Passive Restraint Systems for

m or e i n f or m a t i o n o n t h e a i r ba g s y s t em .

ANTI-LOCK BRAKE SYSTEM LAMP

The Anti-Lock Brake System (ABS) lamp gives an

i n d i c a t i o n w h e n t h e A B S s y s t e m i s f a u l t y o r i n o p e r -

ative. The lamp is hard-wired in the instrument clus-

t e r, a n d i s com p le t el y con t r o ll ed by t h e C o nt r o ll er

An t i -l ock B r a k e (C AB ). I t r e ce iv es ba t t e r y v ol t a g e

through the instrument cluster fused ignition switch

output feed circuit , and is grounded by the CAB. The

l a m p i s t u r n e d o n by t h e C A B f o r a bo u t t w o s e c o n d s

when the ignition switch is turned to the On position

a s a bu lb t e s t . Af t e r t h e bu l b t e st , t h e C AB t u r n s t h e

lamp on or off based upon the results of the ABS sys-

tem self-tests.

Th e C AB con t i n u a l l y m on i t or s t h e AB S ci r cu i t s

a n d s e n s o r s t o d e c i d e w h e t h e r t h e s y s t e m i s i n g o o d

op er a t i n g con d it i on . I f t h e C AB t u r n s t h e l a m p o n

a f t er t h e b u lb t es t , i t i nd ica t e s t h a t t h e C AB h a s

d e t ect e d a s y s t em m a l f u n ct i on a n d /or t h a t t h e A B S

s y s t em h a s becom e i n op er a t i v e . R e f er t o G r ou p 5 -

Brakes for more information.

BRAKE WARNING LAMP

T h e br a k e w a r n i n g l a m p g i v e s a n i n d i c a t i o n w h e n

t h e p a r k i n g br a k e i s a p p l i e d , o r w h e n t h e p r e s s u r e s

i n t h e t w o h a l v e s of t h e s p li t br a k e h y d r a u l i c s y st e m

a r e u n eq u a l . Th e l a m p i s t u r n e d o n w h e n t h e i gn i -

t i on s w i t ch i s i n t h e S t a r t p os it i on a s a b u lb t e st .

A f t e r t h e bu l b t e s t , t h e l a m p i s c o n t r o l l e d by h a r d -

w i r e d i n pu t s f r om t h e p a r k i n g br a k e s w i t ch a n d /or

t h e br a k e w a r n i n g s w i t c h .

The brake warning switch closes to ground when i t

senses unequal hydraulic pressures in the two halves

of t h e s pl it br a k e h y d r a u l ic s y s t e m , p os s ibl y d u e t ol ow b r a k e f lu i d l ev el or b r a k e f l u id l ea k a g e. Th e

pa r k in g b ra k e s w it ch cl os es t o g rou n d w h en t h e

p a r k i n g br a k e i s a p p l i e d . R e f e r t o Gr o u p 5 - B r a k e s

for more informa tion.

CHECK GAUGES LAMP

Th e ch e ck g a u g e s l a m p g i ve s a n i n d ica t i on w h e n

certa in ga uges reflect a condition requiring immedi-

a t e a t t e n t i on . Th e l a m p i s t u r n e d o n b y t h e i n s t r u-

m e n t cl u st e r ci r cu i t r y f or a bo ut t h r e e s e con d s a f t e r

t h e i g n i t i o n s w i t c h i s t u r n e d t o t h e O n p o s i t i o n a s a

bu l b t e s t . A f t e r t h e bu l b t e s t , t h e l a m p i s c o n t r o l l e d

by the instrument cluster circuitry based upon gauged a t a m e ss a g e s r e ce iv ed f r om t h e P o w e r t r a i n C o n t r ol

M od u l e (P C M ) o n t h e C h r y s l er C o ll i si on De t e ct i on

(C C D) d a t a bu s .

The PCM uses several inputs to decide what gauge

data messages are required. The PCM then sends the

p rop er m es sa g e t o t h e i n st r u m en t cl us t er on t h e

C C D d a t a b u s. Th e g a u g e d a t a m es sa g e s f or w h i ch

t h e i n s t r u m e n t c l us t e r i s p r og r a m m e d t o t u r n on t h e

check gauges lamp are:

Engine coolant temperature is high or cri t ical

Engine oil pressure is low

C h a r g i n g s y s t e m f a i l u r e

Sy s t e m v ol t a g e i s h i g h .

CIGAR LIGHTER AND POWER OUTLET

A ci g a r l ig h t e r a n d a n a c ce ss or y p ow e r ou t l et a r e

s t a n da r d eq u ipm en t on t h is m od el . P ow e r t o t h e

a cces sor y pow e r ou t let i s pr ov id ed a t a l l t i mes ,

r e ga r d l e ss of t h e i g n it i on s w i t ch p os i t ion . P ow e r t o

t h e c i g a r l ig h t e r i s s w i t ch e d by a ci g a r l ig h t e r r e l a y,

w h i c h i s o n l y e n e r g i z e d w h e n t h e i g n i t i o n s w i t c h i s

in the Accessory or On positions.

The cigar lighter and accessory power outlet recep-

t a c l e s a r e l o c a t e d i n , a n d s e r v i c e d o n l y a s a p a r t o f ,

the accessory switch bezel unit . I f ei ther recepta cle is

f a u l t y o r d a m a g e d , t h e a c c e s s o r y s w i t c h be z e l m u s t

be replaced.

CIGAR LIGHTER RELAY

Th e c ig a r l ig h t e r r e la y i s a I n t e r n a t i o na l St a n d a r d s

Organiza tion (ISO)-type relay. The cigar l ighter r elay

is a electromechanical device that switches fused bat-

t e r y cu r r en t t o t h e ci ga r l ig h t er w h e n t h e i gn i t ion

switch is turned to the Accessory or On positions. See

t h e Di a g n o si s a n d Te st i n g s ect i on of t h i s g r ou p f or




7/34

more informat ion on the operation of t he cigar l ighter

relay.

Th e ci g a r l i gh t e r r e la y i s l oca t e d i n t h e ju n ct i on

block, on the right cowl side panel below the instru-

ment panel in the passenger compartment. The cigar

l ig ht er r el a y ca n n ot b e r epa i r ed a n d , i f f a u lt y or

d a m a g ed , i t m u s t be r e pl a ce d .

CLUSTER ILLUMI NATION LAM P

Th e cl u st e r i ll u m in a t i o n l a m p s a r e h a r d -w i r e d i n

the instrument cluster. When the park or head lamps

a r e t u r n e d o n , t h e c l u s t e r i l l u m i n a t i o n l a m p s l i g h t .

I l lu m in a t i on b r ig h t n es s i s a d ju s t ed b y r ot a t i n g t h e

h e a d l a m p s w i t ch k n ob (cl ock w i s e t o d i m , cou n t e r -

clockwise to brighten). The instrument cluster illumi-

n a t i on l a m ps r ecei ve b a t t e ry f ee d f r om t h e p a n el

d i mm er r h eos t a t i n t h e h ea d l a m p s w i t ch t h r ou g h a

fuse in the junction block.

E a c h of t h e i ll u mi n a t i on l a m ps i s l oca t e d on t h e

i n st r u m en t cl us t er ci rcu it b oa r d . E a c h l a m p h a s areplaceable bulb a nd bulb holder. Refer to G roup 8L -

Lamps for more information.

COOLANT TEMPERATURE WARNING LAMP

Th e cool a n t t e mp er a t u r e w a r n i n g l a m p g iv es a n

i n d ica t i on w h e n t h e e n gi n e c ool a n t t e m pe r a t u r e i s

h i g h . Th e l a m p i s t u r n ed on by t h e i n s t r u m en t cl u s-

ter circuitry for a bout three seconds aft er th e ignition

s w i t ch i s t u r n ed t o t h e O n p os it i on a s a b u lb t e st .

Af t er t h e b u lb t e st , t h e l a m p i s con t r ol led b y t h e

i n s t r u m en t cl u st e r ci r cu i t r y ba s e d u p on a n e n gi n e

coolant temperature message received from the Pow-

ertrain Control Module (PCM) on the Chrysler Coll i-sion Detection (CCD) data bus.

Th e P C M u s es a n i n pu t f r om t h e e n g in e c ool a n t

t e mp er a t u r e s en s or a n d i n t er n a l p rog r a m m in g t o

d e ci d e w h a t e n gi n e c ool a n t t e m pe r a t u r e m e ss a g e i s

required. The PCM then sends the proper message to

t h e i n s t r u m e n t c l u s t e r o n t h e C C D d a t a b u s . I f t h e

P C M m e s s a g e i n d i ca t e s t h a t cool a n t t e m pe r a t u r e i s

h i g h , t h e i n s t r u m en t cl u st e r ci r cu i t r y t u r n s on t h e

cool a n t t e mp er a t u r e w a r n i n g l a m p a n d g en er a t e s a

single chime t one.

The engine coolant temperature sensor is instal led

i n a t h r e a d e d h o l e t h a t p e n e t r a t e s a c o o l a n t p a s s a g e

of t h e e ng in e. I t i s a t h er m is t or -t y pe s en s or t h a t

ch a n ges i t s i nt er n a l r es is t a n ce w i t h ch a n ges i n

engine coolan t tempera ture. Refer t o G roup 14 - Fuel


coolant temperature sensor.

CRUISE-ON INDICATOR LAMP

The cruise-on indicator lamp gives an indicat ion

when the vehicle speed control system is turned on,

even when the system is not currently engaged. The

lamp is controlled by the instrument cluster circuitry

ba s e d u p on a m e ss a g e r e ce iv ed f r om t h e P o w e r t r a i n

C on t r ol M od u le (P C M ) on t h e C h r y sl er C ol li si on

Detection (CCD) data bus.

T h e P C M u s e s a n i n p u t f r o m t h e a n a l o g r e s i s t o r -

m u l t ip le xe d v eh i cl e s pe ed con t r o l s w i t ch e s i n t h e

steering wheel to decide whether to turn the lamp on

or of f . Th e P C M t h e n s en d s t h e p r op er m e ss a g e t ot h e i n s t r u m en t cl u st e r o n t h e C C D d a t a bu s. R e f er t o

G roup 8H - Vehicle Speed C ontrol System for more

information.

FOUR-W HEEL DRIVE INDICATOR LAM P

PART TIME

On vehicles w ith the optional Command-Trac four-

w h e el d r iv e s y s t em , t h e P a r t Ti m e i n d ica t o r l a m p

l i gh t s w h e n t h e t r a n s f er ca s e i s e n g a g e d i n t h e 4 H o r

4L positions. On vehicles w ith the optiona l S elec-Tra c

f ou r -w h e el d r iv e s y st e m, t h e P a r t Ti me i n di ca t o r

l a m p l i g h t s w h e n t h e t r a n s f e r c a s e i s e n g a g e d i n t h e4 X 4 P art Time or 4 L o positions.

When the ignition switch is in the On position, bat-

t e r y v o l t a g e i s s u p p l i e d t o o n e s i d e o f t h e i n d i c a t o r

la mp bulb. A norma lly-open, plunger-type, four-wh eel

d r i v e s w i t c h t h r e a d e d i n t o t h e t r a n s f e r c a s e i s h a r d -

w i r e d i n s e r i e s be t w e e n t h e o t h e r s i d e o f t h e i n d i c a -

t o r l a m p bu l b a n d g r o u n d . W h e n t h e t r a n s f e r c a s e i s

s h i ft e d i n t o t h e p r op er p os i t ion , t h e p lu n g er of t h e

four-wheel drive switch is moved, closing the switch

a n d p r ov i di n g a p a t h t o g r ou n d . Th i s c a u s es t h e P a r t

Time indicator lamp bulb to l ight.

Refer to G roup 21 - Tran smission for more infor-

m a t i o n o n t h e t r a n s f e r c a s e s h i f t m e c h a n i s m .

FULL TIME

The Full Time indicator lamp is only operational

on v eh i cl es e q u ip pe d w i t h t h e op t i on a l Se l ec-Tr a c

f ou r -w h e e l d r i ve s y s t em . Th e Fu l l Ti m e i n d ica t or

l a m p l i g h t s w h e n t h e t r a n s f e r c a s e i s e n g a g e d i n t h e

4 X 4 F ull Time position.

When the ignition switch is in the On position, bat-

t e r y v o l t a g e i s s u p p l i e d t o o n e s i d e o f t h e i n d i c a t o r

la mp bulb. A norma lly-open, plunger-type, four-wh eel

d r i v e s w i t c h t h r e a d e d i n t o t h e t r a n s f e r c a s e i s h a r d -

w i r e d i n s e r i e s be t w e e n t h e o t h e r s i d e o f t h e i n d i c a -

t o r l a m p bu l b a n d g r o u n d . W h e n t h e t r a n s f e r c a s e i ss h i ft e d i n t o t h e p r op er p os i t ion , t h e p lu n g er of t h e

four-wheel drive switch is moved, closing the switch

and providing a path to ground. This causes the Full

Time indicator lamp bulb to l ight.

Refer to G roup 21 - Tran smission for more infor-

m a t i o n o n t h e t r a n s f e r c a s e s h i f t m e c h a n i s m .

HEADLAMP HIGH BEAM INDI CATOR LAMP

T h e h e a d l a m p h i g h be a m i n d i c a t o r l a m p g i v e s a n

i n d ica t i o n w h e n t h e h e a d l a m p h i g h be a m s a r e t u r n e d

on . Th e l a m p i s con t r ol le d b y a h a r d -w i r ed i n pu t




8/34

from the headla mp dimmer (multi-function) switch.

O ne s id e of t h e i nd ica t or b ul b i s g rou n ded a t a l l

t i m es . Th e o t h e r s i d e of t h e bu lb r e ce iv es a ba t t e r y

feed through the contacts of the dimmer switch when

the multi-function switch stalk is actuated to turn on

t h e h ea d la m p h ig h b ea m s. R ef er t o G r ou p 8L -

Lamps for more information.

LOW FUEL WARNING LAMP

Th e l ow f u el w a r n i n g l a m p g iv es a n i n di ca t i on

w h e n t h e f u e l l e v e l i n t h e f u e l t a n k h a s f a l l e n be l o w

a bo u t o n e-e ig h t h of a f u ll t a n k , a s r e gi s t er e d o n t h e

f u el g a u g e . Th e i n s t r u me n t cl u s t er ci r cu i t r y l ig h t s

t h e l a m p f o r a bo u t t h r e e s e c o n d s w h e n t h e i g n i t i o n


Af t e r t h e bu lb t e s t , t h e i n s t r u m en t cl u s t er ci r cu i t r y

con t r o ls t h e l a m p ba s e d u p on a f u el l ev el m e ss a g e

received from the Powertrain Control Module (PCM)

on the Chrysler Coll ision Detection (CCD) data bus.

T h e P C M u s e s a n i n p u t f r o m t h e f u e l g a u g e s e n d -i n g u n i t a n d i n t er n a l p rog r a m m in g t o d e ci de w h a t

fuel level message is required. The PCM then sends

t h e p r op er m e ss a g e t o t h e i n s t r u me n t cl u st e r on t h e

C C D d a t a b us . I f t h e P C M m es sa g e i n di ca t e s t h a t

t h e f u el l ev el i s be l ow on e -e ig h t h of a f u ll t a n k f or

m or e t h a n t e n s econ d s , t h e i n s t r u me n t cl u st e r ci r -

c u i t r y t u r n s o n t h e l o w f u e l w a r n i n g l a m p a n d g e n -

e r a t e s a s i n g l e c h i m e t o n e . O n c e t h e l a m p i s t u r n e d

o n , a n i n c r e a s e i n t h e f u e l l e v e l m e s s a g e o f a t l e a s t

one full needle width for more than twenty seconds is

required before the cluster wil l turn the lamp off.

The fuel ga uge sending unit is mounted t o the elec-

tric fuel pump module inside the fuel t ank. The send-i n g u n i t h a s a f l o a t a t t a c h e d t o t h e e n d o f a s w i n g -

a r m . Th e f loa t m ov es u p or d ow n w i t h in t h e f u el

tank as the fuel level changes. As the float moves, an

electrical conta ct on t he pivot end of t he sw ing-ar m

wipes across a resistor coil , which changes the resis-

t a n c e o f t h e s e n d i n g u n i t . R e f e r t o Gr o u p 1 4 - Fu e l


f u el g a u g e s e n d i n g u n i t .

LOW OIL PRESSURE WARNING LAM P

The low oil pressure warning lamp gives an indica-

tion when the engine oil pressure is low. The lamp is

t u r n ed on b y t h e i n st r u m en t cl us t er ci r cu i t ry f or

a b ou t t h r ee s econ d s a f t er t h e i gn it i on s w it ch i s

t u r n ed t o t h e O n p os it i on a s a b u lb t e st . Af t er t h e

bu l b t e s t , t h e l a m p i s c o n t r o l l e d by t h e i n s t r u m e n t

cl u st e r ci r cu i t r y ba s e d u p on a n e n gi n e oi l p r es s u r e

message received from the Powertrain Control Mod-

ule (PCM) on the Chrysler Coll ision Detection (CCD)

d a t a b u s .

T h e P C M u s e s a n i n p u t f r o m t h e e n g i n e o i l p r e s -

s ur e s en sor a n d i nt er n a l pr og ra m m in g t o d eci de

w h a t e n gi n e o i l p r e ss u r e m e s s a g e i s r e q u ir e d . Th e

P C M t h e n s e n d s t h e p r o p e r m e s s a g e t o t h e i n s t r u -

m en t cl us t er on t h e C C D d a t a b u s. I f t h e P C M m es -

sa ge in dica t es t ha t oil pr essure is low, t he

instrument cluster circuitry turns on the low oil pres-

s u r e w a r n i n g l a m p .

Th e e n gi n e oi l p r es s u r e s e n sor i s i n s t a l l ed i n a

t h r e a d e d h o l e t h a t p e n e t r a t e s a n o i l p a s s a g e o f t h ee n gi n e. Th e e n gi n e oi l p r es s u r e s e n s or con t a i n s a

f le xi ble d i a p h r a g m a n d a v a r i a bl e r e s i st o r coi l. Th e

d ia p hr a g m m ov es i n r es pon se t o ch a n g es i n t h e

engine oil pressure, which changes the internal elec-

t r i ca l r e si s t a n c e o f t h e s en s or. R e fe r t o G r ou p 14 -


the engine oil pressure sensor.

LOW WASHER FLUID WARNING LAMP

T h e l o w w a s h e r f l u i d w a r n i n g l a m p g i v e s a n i n d i -

cation when the fluid level in the washer fluid reser-

v oi r i s t oo l ow . Th e i n st r u m en t cl us t er ci r cu it r y

con t r ol s t h e l a m p b a s ed u pon a h a r d -w i r ed i n pu tfrom the washer fluid level sensor.

Th e w a s h e r f l u i d l e ve l s e n sor u s es a f l oa t i n t h e

reservoir t o monitor the fluid level . The up an d down

a c t i on of t h e f l oa t op en s or cl os es t h e s w i t ch w i t h i n

the washer fluid level sensor that provides a ground

signal to the instrument cluster circuitry.

If the instrument cluster circuitry senses a ground

i n pu t f r om t h e w a s h e r f lu id l ev el s en s or f or m or e

t h a n a bou t t h i r t y s e con d s , i t t u r n s on t h e l ow w a s h er

fluid warning lamp. This helps to reduce the effects

of fluid sloshing within the reservoir. This lamp also

l a t ch es . O n ce t h e l a m p h a s b ee n t u r n ed on , i t w i ll

r e m a i n o n u n t i l w a s h e r f l u i d i s a d d e d t o t h e r e s e r -voir and the ignition switch is cycled.

Refer to G roup 8K - Wiper an d Wa sher S ystems for

more information on the washer fluid level sensor.

MALFUNCTION INDICATOR LAMP

The Check Engine or Malfunction Indicator Lamp

(M I L ) g i v e s a n i n d i c a t i o n w h e n t h e P o w e r t r a i n C o n -

tr ol Module (PCM) ha s recorded a Dia gnostic Trouble

C o d e (DT C ) f o r a n O n - B o a r d Di a g n o s t i c s I I (O B DI I )

emissions-related circuit or component malfunction.

The lamp is controlled by the instrument cluster cir-

c u i t r y ba s e d u p o n m e s s a g e s r e c e i v e d f r o m t h e P C M

on t h e C h r y s l er C o ll i si on De t e ct i on (C C D) d a t a bu s.

Th e P C M s en d s a l a m p -on m e ss a g e f o r a bou t t h r e e

seconds when the ignition switch is turned to the On

p o s i t i o n a s a bu l b t e s t .

Fo ll ow i n g t h e bu l b t e st , t h e P C M u s es i n p u t s f r o m

m a n y e m is s ion s -r e la t e d ci r cu i t s a n d s en s or s , a l on g

w i t h i t s i n t e r n a l p r o g r a m m i n g , t o d e c i d e w h e t h e r a

con d it i on e xi st s t h a t r eq u ir es t h e M I L l a m p t o b e

t u r n e d o n . T h e P C M t h e n s e n d s t h e p r o p e r m e s s a g e

t o t h e i ns t ru m en t cl us t er on t h e C C D d a t a b us t o

t u r n t h e l a m p o n o r o f f .




9/34

Th e M I L l a m p c a n a l s o be u s ed t o d i s pl a y a s t or e d

DTC by flashing on and off. Refer to Group 14 - Fuel

S y s t em s f or m or e i n for m a t i on on t h e P C M or t h e

P C M i n pu t s . R e fe r t o G r ou p 2 5 - E m i s s ion C o n t r ol

S y s t em s f or m or e i n for m a t i on on D TC s a n d t h ei r

retrieval .

SEAT BELT REMI NDER LAMP

Th e s ea t b elt r em in der la m p g iv es a vis ua l

reminder to the vehicle occupants to fasten their seat

belts. The lamp is turned on by the instrument clus-

ter circuitry for about seven seconds wh en t he igni-

t ion s w it ch i s t ur ned t o t h e On pos it ion . Th e

instrument cluster a lso receives a har d-wired input

f r om t h e d r i v er s ea t b el t s w i t ch . I f t h e d r iv er s ea t

bel t s w i t ch i s cl os ed (s ea t bel t i s n ot bu ck le d ), t h e

instrument cluster wil l generate a chime warning for

the duration of the seat belt reminder lamp i l lumina-

t i on . Th e c h i m e w a r n i n g w i ll s t op w h e n t h e d r i v e r

seat belt switch is open (seat belt is buckled).R e fe r t o Gr o u p 8U - C h i m e /B u z z er Wa r n i n g Sy s -

t e ms f or m or e i n for m a t i on on t h e d r iv er s ea t b el t

switch.

TURN SIGNAL INDICATOR LAMP

Th e l e ft a n d r i g h t t u r n s i gn a l i n d ica t o r l a m p s g i v e

a n i n d i c a t i o n w h e n t h e t u r n s i g n a l c i r c u i t s a r e a c t i -

v a t e d . Th e l a m p s a r e h a r d -w i r e d i n t h e i n s t r u me n t

cluster, a nd ar e completely controlled by the turn sig-

n a l a n d h a z a r d w a r n i n g (m u l t i-f u n ct i on ) s w i t c h es .

Th e i n d i ca t o r l a m p s a r e g r o un d e d a t a l l t i m es a n d

r ecei ve b a t t er y f eed t h r ou gh t h e con t a ct s of t h e

m u lt i -f un ct i on s w i t ch w h e n t h e t u r n s ig n a l l ev er(m u l t i-f u n ct i on s w i t ch s t a l k ) or h a z a r d w a r n i n g bu t -

t o n a r e a c t u a t e d t o t h e O n p o s i t i o n . T h e i n s t r u m e n t

cluster circuitry does not perform a bulb test of these

l a m p s . R ef er t o Gr o u p 8J - Tu r n S i g n a l a n d H a z a r d

Warn ing Syst ems for m ore informat ion.

UPSHIFT INDICATOR LAM P

Ve hi cl es eq u ip ped w i t h a m a n u a l t r a n s m is s ion

have an upshift indicator lamp. The upshift indicator

lamp gives an indication when the driver should shift

t o t h e n e x t h i g h es t g ea r f or t h e bes t f u el e con om y.

The lamp is controlled by the instrument cluster cir-

cuitry based upon a message received from the Pow-

er t r a in C on t r ol M od ul e (P C M ) on t h e C h r ys ler

Coll ision Detection (CCD) data bus.

Th e P C M u s e s i n p u t s f r om m a n y s en s or s a n d i t s

i n t e r n a l p r o g r a m m i n g t o d e c i d e w h e t h e r t h e e n g i n e

speed and load conditions are correct for a transmis-

s i on u p sh i ft . Th e P C M t h e n s en d s t h e p r op er m e s-

s a g e t o t h e i n s t r um en t cl us t er on t h e C C D d a t a b us

t o t u r n t h e l a m p o n or of f. Th e P C M w i ll s en d a

l a m p-of f m es sa g e t h r ee t o f iv e s econ d s a f t er a

lamp-on message, i f an upshift is not performed. The

l a m p w i ll t h e n r em a i n of f u n t il t h e v eh i cl e s t o ps

a c cel er a t i n g a n d i s b r ou g ht b a ck i n t o t h e r a n g e o f

l a m p o p e r a t i o n , o r u n t i l t h e t r a n s m i s s i o n i s s h i f t e d

i n t o a n o t h e r g e a r . R e f er t o G r ou p 1 4 - Fu e l Sy s t e m s

for m or e in for ma t ion on t h e P C M a n d t h e P C M

inputs.

VOLTAGE WARNING LAMP

Th e v ol t a ge w a r n in g l a m p g iv es a n i nd ica t i on

w h e n t h e e le ct r i ca l s y s t em v ol t a g e i s t oo l ow or t o o

h i g h . T h e l a m p i s t u r n e d o n by t h e i n s t r u m e n t c l u s -

ter circuitry for about three seconds aft er th e ignition


Af t er t h e b ul b t e st , t h e l a m p i s con t r ol le d b y t h e

i n st r u m en t cl us t er ci r cu it r y b a s ed u pon a s y st e m

v ol t a g e m e ss a g e r e ce iv ed f r om t h e P o w e r t r a i n C o n-

trol Module (P CM) on t he C hrysler C oll ision Detec-

t i o n (C C D) d a t a bu s .

The PCM uses an input from the electrical system

a n d i n t er n a l p rog r a m m in g t o d eci d e w h a t s y st e mv ol t a g e m es sa g e i s r eq u ir ed . Th e P C M t h e n s en d s

t h e p r op er m e ss a g e t o t h e i n s t r u m en t cl u s t er on t h e

C C D d a t a b us . I f t h e P C M m es sa g e i n di ca t e s t h a t

t h e ch a r gi ng s ys t em i s t oo l ow or t oo h ig h, t h e

i n st r u m en t cl us t er ci r cu i t ry t u r n s on t h e v ol t a g e

w a r n i n g l a m p .


m a t i o n o n t h e P C M . R e f e r t o G r o u p 8 C - C h a r g i n g

S y s t em s f or m or e i n for m a t i on on ch a r g in g s y st e m

components and diagnosis.

DIAGNOSIS AND TESTING

INSTRUMENT CLUSTER

If al l of t he ga uges an d/or indicat or lamps ar e inop-

e ra t i v e, p er f or m t h e P r e li m in a r y D i a g n os is . I f a n

i n di vi d ua l g a u g e or C h r y sl er C ol li si on D e t ect i on

(CCD) data bus message-controlled indicator lamp is

i n op er a t i v e , g o d i r e ct l y t o t h e Act u a t or Te st . I f a n

i n d iv i du a l h a r d -w i r e d i n d ica t o r l a m p i s i n op er a t i v e ,

go directly to the diagnosis for that lamp. For circuit

descriptions and diagra ms, refer to 8W-40 - Instru-

ment Cluster in Group 8W - Wiring Diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVE

RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-

BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.




10/34

PRELIMINARY DIAGNOSIS

(1 ) I f t h e i n d i c a t o r l a m p s o p e r a t e , bu t n o n e o f t h e

g a u g e s o p e r a t e , g o t o St e p 2 . I f a l l o f t h e g a u g e s a n d

the da ta bus message-controlled indicator la mps a re

inoperative, go to Step 5.

(2) Check the Ignition-Off Draw (IOD) fuse in the

P o w e r Di s t r i bu t i o n C e n t e r (P DC ). I f O K, g o t o St e p3. If not OK, repair the shorted circuit or component

a s r e q u i r e d a n d r e p l a c e t h e f a u l t y f u s e .

(3) C h e ck f or b a t t e ry v ol t a g e a t t h e I O D f us e i n

t h e P D C . I f O K , g o t o S t e p 4 . I f n o t O K , r e p a i r t h e

open circuit as required.

(4) D is con n ect a n d i sol a t e t h e b a t t e ry n eg a t i ve

cable. Remove the instrument cluster as described in

this group. Connect the battery negative cable. Check

for bat tery volta ge a t the fused B (+ ) circuit cavity of

t h e l ef t i n s t r u m en t cl u st e r w i r e h a r n e s s con n e ct o r

(connector A). If OK, go t o t he Actua tor Test. If not

OK , r epa i r t h e open cir cu it t o t h e I OD f us e a s

required.(5) C h e ck t h e s w i t ch e d i g n it i on f u s e i n t h e ju n c-

t i o n bl o c k . I f O K, g o t o St e p 6 . I f n o t O K, r e p a i r t h e

shorted circuit or component as required and replace

t h e f a u l t y f u s e .

(6) Turn the ignition sw itch to th e On position a nd

ch eck f or b a t t e ry v ol t a g e a t t h e s w i t ch ed i gn i t ion

fuse in the junction block. If OK, go to Step 7. If not

O K, r e p a i r t h e o p e n c i r c u i t t o t h e i g n i t i o n s w i t c h a s

required.

(7) Tu r n t h e i g n it i on s w i t ch t o t h e O f f p os i t ion .

D i s con n ect a n d i sol a t e t h e b a t t e ry n eg a t i ve ca b l e.

Reinstal l the instrument cluster. Connect the battery

n e ga t i ve ca bl e . Tu r n t h e i g n it i on s w i t ch t o t h e O np o s i t i o n . Se t t h e p a r k i n g br a k e . T h e br a k e w a r n i n g

l a m p s h o u l d l i g h t . I f O K, g o t o St e p 8 . I f n o t O K, g o

t o St e p 9 .


Tu r n o n t h e p a r k l a m p s a n d a d ju s t t h e p a n e l l a m p s

dimmer rheostat to the full bright position. The clus-

t e r i l l u m i n a t i o n l a m p s s h o u l d l i g h t . I f O K, g o t o t h e

Actuator Test. I f n ot OK, go to S tep 10.


D i s con n ect a n d i sol a t e t h e b a t t e ry n eg a t i ve ca b l e.

R e mov e t h e i n s t r u m en t cl u st e r a s d e scr i bed i n t h i s

g r ou p . C o n n ect t h e ba t t e r y n e ga t i v e c a ble . Tu r n t h e

ignition switch to the On position. Check for battery

volta ge a t the fused ignition switch output (run/sta rt)

circuit cavity of the left instrument cluster wire har-

ness connector (connector A). If OK, go to the Actua-

t or Tes t . I f n ot O K , r ep a ir t h e op en ci r cu it t o t h e

junction block as required.

(10) Di s con n e ct a n d i s ol a t e t h e ba t t e r y n e g a t i v e

cable. Remove the instrument cluster as described in

this group. Check for continuity between the ground

circuit cavity of the left instrument cluster wire har-

n e ss con n e ct o r (con n e ct o r A) a n d a g ood g r ou n d .

There should be continuity. If OK, go to the Actua tor

Test. If not OK, repair the open circuit to ground a s

required.

ACTUATOR TEST

Th e i n s t r u m en t cl u st e r a ct u a t or t e s t w i l l p u t t h e

cluster into i ts self-diagnostic mode. I n this mode the

cluster wil l position each of the gauge needles at var-

i o u s s p e c i f i e d c a l i br a t i o n p o i n t s , a n d t u r n a l l o f t h e

CCD data bus message-controlled lamps on and off at

specified time intervals (Fig. 1) or (Fig. 2).

Successful completion of the actuator test wil l con-

firm that the cluster circuitry, gauges, and lamps are

capable of opera ting as designed. However, th ere may

s t i l l b e a p r o b l e m w i t h t h e C C D d a t a b u s , t h e P o w -

e r t r a i n C o n t r ol M od u l e (P C M ), t h e Ai r ba g C o nt r o l

Module (ACM), or the inputs to one of these modules.

U s e a DR B s c a n t o o l a n d t h e p r o p e r Di a g n o s t i c P r o -

cedures manual for testing of these components.

If an individual gauge does not respond properly orat al l during t he Actua tor Test, the instrument clus-

t e r s h ou l d be r e mov ed . H o w e ve r, ch e ck t h e g a u g e

m ou n t in g s cr ew s on t h e p ri n t ed ci r cu it b oa r d f or

proper t ightness before considering instrument clus-

t e r r e pl a c em e n t . I f t h e m ou n t i n g s cr e w s ch e ck O K,

replace the faulty cluster.

I f a n i n d iv i du a l i n d ica t o r l a m p d o es n o t i l lu m i n a t e

d u r in g t h e Act u a t or Tes t , t h e i n st r u m en t cl us t er

s h ou l d be r e m ov ed . H o w e ve r, ch e ck t h a t t h e i n ca n -

d es cen t l a m p b ul b i s n ot f a u lt y a n d t h a t t h e b u lb

h ol d er i s p rop er l y i n st a l l ed on t h e ci r cu it b oa r d

before considering instrument cluster replacement. If

t h e b ul b a n d b ul b h ol der ch eck O K, r ep la ce t h efaulty instrument cluster.

(1) B e g in t h e t es t w i t h t h e i g n it i on s w i t ch i n t h e

Off position.

(2) Depress the trip odometer reset button.

(3) While holding t he trip odometer reset button

d e pr e ss ed , t u r n t h e i g n it i on s w i t ch t o t h e O n p os i -

t i o n , bu t d o n o t s t a r t t h e e n g i n e .

(4) Release the trip odometer reset button.

(5) Compare the operation of the suspect gauge(s)

a nd/or la mp(s) wit h the chart (Fig. 1) or (Fig. 2).

(6) The cluster will exit the self-diagnostic mode at

the completion of the test , or i f the ignition switch is

turned to the Off position.(7) G o ba ck t o S t ep 1 t o r epea t t he t est , if

required.

COOLANT TEMP ERATURE GAUGE

If the problem being diagnosed is relat ed to coolan t

t e m pe r a t u r e g a u g e a c cu r a c y, be ce r t a i n t o con f ir m

t h a t t h e p r obl em i s w i t h t h e g a u g e a n d n o t w i t h c ool -

i n g s y s t em p er f or m a n c e. Th e a c t u a l e n gi n e cool a n t

t e m p e r a t u r e s h o u l d be c h e c k e d w i t h a t e s t g a u g e o r

thermometer and compared to the instrument cluster

cool a n t t e m pe r a t u r e g a u g e r e a d i n gs bef or e y ou p r o-


DIAGNOSIS AND TESTING (Continued)


11/34

Fig. 1 Low-Line Instrument Cluster Actuator Test

AIRBAGSEAT BELTUPSHIFTCHECK ENGINE (MIL)CRUISE ONLOW WASHERLOW OIL PRESSURE WARNINGBATTERY WARNINGCOOLANT TEMPERATURE WARNINGSPEEDOMETER(MILES PER HOUR)(KILOMETERS PER HOUR)FUELODOMETER 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC.ONOFFONOFFONOFFONOFFONOFFONOFFONOFFONOFFONOFF

COMPLETE DIAGNOSTICSSTART DIAGNOSTICSNOTE: 1.5 SECONDS AFTER COMPLETING TEST, ALL POINTERS SHOULD RETURN TO POINTER STOP AND ODOMETER SHOULD BE TURNED OFF.




12/34

Fig. 2 High-Line Instrument Cluster Actuator Test

LOW FUEL WARNINGAIRBAGSEAT BELTUPSHIFTCHECK ENGINE (MIL)CHECK GAUGESCRUISE ONLOW WASHERSPEEDOMETER(MILES PER HOUR POLICE ONLY)(MILES PER HOUR EXCEPT POLICE)(KILOMETERS PER HOUR)TACHOMETERFUELTEMPERATUREOILVOLTODOMETER 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC. 2 SEC.ONOFFONOFFONOFFONOFFONOFFONOFFONOFFONOFF

COMPLETE DIAGNOSTICSSTART DIAGNOSTICSNOTE: 1.5 SECONDS AFTER COMPLETING TEST, ALL POINTERS SHOULD RETURN TO POINTER STOP AND ODOMETER SHOULD BE TURNED OFF.




13/34

ceed w ith gauge diagnosis. Refer t o G roup 7 - Cooling

Sy s t e m f or m or e i n f or m a t i o n . R e f er t o Gr o u p 8 W -

Wi ri n g D i a g r a m s f or ci r cu it d es cr ip t ion s a n d d ia -

g r a m s .

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANY

STEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-


Di a g n o si s of t h e cool a n t t e m pe r a t u r e s en s or a n d

circuit , the Chrysler C oll ision Detection (CCD) da ta

bu s , a n d /or t h e P o w e r t r a i n C o n t r ol M od u l e (P C M )

s hou ld b e per for med w it h a D R B s ca n t ool a s

described in the proper Diagnostic Procedures man-u a l . Fo r d i a g n o s i s o f t h e c o o l a n t t e m p e r a t u r e g a u g e

and the instrument cluster circuitry, see Instrument

Cluster in this group.

FUEL GAUGE

I f t h e p r obl em bei n g d i a g n os ed i s r e l a t e d t o f u e l

g a u g e a c c u r a c y , be c e r t a i n t o c o n f i r m t h a t t h e p r o b-

l e m i s w i t h t h e g a u g e o r s e n d i n g u n i t a n d n o t w i t h

t h e f u e l t a n k . I n s p e c t t h e f u e l t a n k f o r s i g n s o f d a m -

a g e or d i st o r t ion t h a t cou l d a f fe ct t h e s en d i n g u n i t

performa nce before you proceed with fuel gauge diag-

nosis. Refer to Group 8W - Wiring Diagrams for cir-

cuit descriptions and diagrams.

WARNING: ON VEHICLES EQUIPPED WITH AIR-

BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS OR

SERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

Di a g n o si s o f t h e f u el g a u g e s e n di n g u n i t a n d ci r -

cu it , t h e C h r y sl er C ol li si on D e t ect i on (C C D ) d a t abu s , a n d /or t h e P o w e r t r a i n C o n t r ol M od u l e (P C M )

s hou ld b e per for med w it h a D R B s ca n t ool a s

described in the proper Diagnostic Procedures man-

u a l . F o r d i a g n o s i s o f t h e f u e l g a u g e a n d t h e i n s t r u -

ment cluster circuitry, see Instrument Cluster in this

group.

ODOMETER AND TRIP ODOMETER

If the problem being diagnosed is related to odom-

eter a nd/or tr ip odometer a ccura cy, be certa in to con-

f ir m t h a t t h e p r ob le m i s w i t h t h e d i sp la y a n d n ot

with an incorrect speedometer pinion gear, axle ra tio,

or t i r e s i ze . R e fe r t o Gr o u p 21 - Tr a n s m i s si on f or

m or e i n for m a t i o n on t h e s pe ed om e t er p in i on g ea r .

R ef er t o G r o up 8W - Wi r in g D i a g r a m s f or ci rcu it

descriptions and diagrams.


RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-

CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

Dia gnosis of the vehicle speed sensor an d circuit ,

t h e C h r y sl er C ol li si on D e t ect i on (C C D ) d a t a b u s,

and /or t he P owertrain Control Module (PC M) should

be p er f or m e d w i t h a DR B s ca n t o ol a s d e s cr i bed i nt h e p r o p e r Di a g n o s t i c P r o c e d u r e s m a n u a l . Fo r d i a g -

nosis of the odometer a nd/or t rip odometer a nd the

instrument cluster circuitry, see I nstrument Cluster

in this group.

OIL PRESSURE GAUGE

I f t h e p rob lem b ei n g d ia g n os ed i s r el a t e d t o oi l

p r es s u r e g a u g e a c cu r a c y, be c e rt a i n t o con f ir m t h a t

t h e p rob lem is w i th t h e g a u ge a n d n ot w i th t h e

engine oil ing system performance. The actual engine

oil pressure should be checked with a test gauge and

com pa r e d t o t h e i n st r u m en t cl u st e r oi l p res s ur e

g a u g e r e a d i n g s be f o r e y o u p r o c e e d w i t h g a u g e d i a g -n os i s. R e fe r t o Gr o u p 9 - E n g i n es f or m or e i n f or m a -

tion. Refer to Group 8W - Wiring Diagrams for circuit

descriptions and diagrams.



CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONAL

INJURY.

Dia gnosis of th e oil pressure sensor an d circuit , t he

Chrysler Collision Detection (CCD) dat a bus, a nd/or

the Powertrain Control Module (PCM) should be per-

f or m ed w i t h a D R B s ca n t ool a s d es cr ib ed i n t h e

proper Diagnostic Procedures manual . For diagnosis

of t h e oi l p r e ss u r e g a u g e a n d t h e i n s t r u me n t cl u st e r

circuitry, see Instrument Cluster in this group.




14/34

SPEEDOM ETER

If the problem being diagnosed is related to speed-

ometer accuracy, be certain to confirm that the prob-

l e m i s w i t h t h e s p e e d o m e t e r g a u g e a n d n o t w i t h a n

incorrect speedometer pinion gear, axle ratio, or t ire

size. Refer t o G roup 21 - Tra nsmission for more infor-

m a t i on on t h e s pe ed om et e r p in i on g ea r . R ef er t oG roup 8W - Wiring Dia grams for circuit descriptions

a n d d ia g r a m s .

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANY

STEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-


Dia gnosis of t he vehicle speed sensor an d circuit ,

t h e C h r y sl er C ol li si on D e t ect i on (C C D ) d a t a b u s,

an d/or the P owertra in Control Module (PCM) should

be p er f or m e d w i t h a DR B s ca n t o ol a s d e s cr i be d i n

t h e p r o p e r Di a g n o s t i c P r o c e d u r e s m a n u a l . Fo r d i a g -

nosis of the speedometer and the instrument cluster

circuitry, see Instrument Cluster in this group.

TACHOM ETER



CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

R e fe r t o Gr o u p 8W - Wi r in g Di a g r a m s f or ci r cu i t

d e scr i pt i on s a n d d i a g r a m s . Di a g n o si s o f t h e cr a n k -

shaft position sensor and circuit , the Chrysler Coll i-

sion Detection (CCD ) data bus, a nd/or the P owertrain

C o n t r ol M od u l e (P C M ) s h ou l d be p er f or m e d w i t h a

DR B s ca n t o ol a s d e scr i be d i n t h e p r op er Di a g n o st i cP r o ce d ur e s m a n u a l . Fo r d i a g n os i s o f t h e t a c h om e t er

and the instrument cluster circuitry, see Instrument

Cluster in this group.

VOLTM ETER

I f t h e p r o bl e m be i n g d i a g n o s e d i s r e l a t e d t o v o l t -

m e t er g a u g e a c cu r a c y, be ce r t a i n t o con f ir m p r op er

charging system operation before considering instru-

m en t cl us t er r epl a cem en t . R ef er t o G r ou p 8C -

C h a r gi ng S y st em f or m or e i nf or m a t ion . R ef er t o

G roup 8W - Wiring Dia gram s for circuit descriptions

a n d d ia g r a m s .


BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS OR

SERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONALINJURY.

Di a g n o si s o f t h e s y s t em v ol t a g e i n pu t ci r cu i t , t h e

Chrysler Collision Detection (CCD) dat a bus, a nd/or

the Powertrain Control Module (PCM) should be per-

f or m ed w i t h a D R B s ca n t ool a s d es cr ib ed i n t h e

proper Diagnostic Procedures manual . For diagnosis

of the voltmeter and the instrument cluster circuitry,

see Instrument Cluster in this group.

AIRBAG INDI CATOR LAMP

The diagnosis found here addresses an inoperative

a i r ba g i n d ica t o r l a m p c on d i t i on . I f t h e a i r ba g i n d i ca -

t o r l a m p s t a y s o n w i t h t h e i g n i t i o n s w i t c h i n t h e O n

p os it i on , or com es on a n d s t a y s on w h i le d r iv in g ,

r ef er t o G r o up 8M - P a s si ve R es t r a i nt S y s t em s f or

d i a g nos is . F or ci rcu it d es cr i pt i on s a n d d ia g r a m s ,

refer to 8W-40 - Instrument Cluster, and 8W-43 - Air-

ba g Sy s t e m i n G r ou p 8 W - Wi r in g Di a g r a m s .


BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONAL

INJURY.

I f t h e a i r ba g i n d i c a t o r l a m p f a i l s t o l i g h t w h e n t h e

i g n i t i o n s w i t c h i s t u r n e d t o t h e O n p o s i t i o n , r e p l a c e

t h e a i r ba g i n di ca t o r l a m p b u lb w i t h a k n ow n g ood

u n i t . I f t h e a i r ba g i n d i c a t o r l a m p s t i l l f a i l s t o o p e r -

a t e , d i a g n o s i s o f t h e a i r ba g l a m p a n d t h e i n s t r u m e n tcluster circuitry should be performed as described in

I n s t r u m e n t C l u s t e r i n t h i s g r o u p . I f t h e a i r ba g l a m p

and instrument cluster circuitry are OK, diagnosis of

t h e a i r b a g s y s t e m a n d t h e C C D d a t a b u s s h o u l d b e

p e r f o r m e d w i t h a DR B s c a n t o o l a s d e s c r i be d i n t h e

proper Diagnostic Procedures manual .

ANTI-LOCK BRAKE SYSTEM LAMP

The diagnosis found here addresses an inoperative

Anti-lock Brake System (ABS) lamp condition. If the

A B S l a m p s t a y s o n w i t h t h e i g n i t i o n s w i t c h i n t h e




15/34

On position, or comes on and stays on while driving,

r ef er t o G r o up 5 - B r a k es f or d ia g n os is . I f n o AB S

problem is found, the following procedure w il l help

l oca t e a s h or t or op en i n t h e AB S l a m p c i r cu i t . Fo r

circuit descriptions an d diagra ms, refer to 8W-40 -

Instrument Cluster, and 8W-35 - All-Wheel Anti-Lock

B r a k es i n G r ou p 8 W - Wi r in g Di a g r a m s .

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, OR

INSTRUMENT PANEL COMPONENT DIAGNOSIS ORSERVICE. FAILURE TO TAKE THE PROPER PRE-CAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONAL

INJURY.

(1) Check the fuse in the junction block. If OK, go

t o S t e p 2 . I f n ot O K ,

EXJ_8E99 jeep xj service manual

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Transcript of EXJ_8E99 jeep xj service manual