E46ICBodyElect

8/19/2019 E46ICBodyElect

1/23

Initial Print D ate: 02/2000 R evision D ate: 4/13/00

Subject Page

Introduction ....................................................................................... 2

E46iC B us System s........................................................................... 4

Pow er W indow s ................................................................................ 5

C entral Locking ................................................................................. 6

Anti-Theft Alarm (D W A)...................................................................... 7

SD R M odule (C urrently Under D evelopm ent, N ot Yet Avaliable for TheU .S M arket.

Lighting C ircuits................................................................................. 10

H eated R ear W indow ........................................................................ 12

Audio System .................................................................................... 14

Antennas/D iversity............................................................................. 16

EN G IN E/SU SP EN SIO N /B R AK ES

D rivetrain (Engine).............................................................................. 18

Front Suspension .............................................................................. 20

R ear Suspension ............................................................................... 21

B rakes ......................................................................................... 22

Table of Contents


2/23

2E46iC bodyelect/ST039/4/13/00

BODY

BODY ELECTRONIC SYSTEMS

MODEL: E46 CONVERTIBLEPRODUCTION DATE: 01/2000

Objectives of the Module:

After com pleting this m odule, you w ill be able to:

D efine the changes that have occurred to the B ody Electronic System s for the E46iC .

•D escribe the function of the new battery box for the E46iC .

•D iscuss the operation of the SD R sensor for the D W A system .

•D escribe the operation of the tw o relay system for the rear w indow defogger.

•D escribe and identify the A ntenna and diversity system of the E46iC


3/23

BODY ELECTRONICS

INTRODUCTION

The body electronics system s of the E46iC prim arily correspond to the E46 C oupe. Thisincludes the Instrum ent C luster, D river’s Inform ation and C entral B ody Electronics (ZKE)system s.

Various m odifications w ere incorporated into these system s for C onvertible specific usage.C hanges have occurred in the follow ing system s:

•Pow er W indow O peration.•C entral Locking System .

•Anti - Theft Alarm System (D W A).•M R S III- D eletion of ITS H ead Air B ags.•H eated R ear W indow O peration (w ith soft and hard tops).•Audio System - Speaker Type and Location.•Audio System Antennas - Type and Location.•U niversal G arage D oor O pener (U G D O ) - Incorporated into rear view m irror.

The location of the battery rem ains in the trunk. H ow ever, a new ly designed battery box isused. The battery box is allow ed to float on the vertical axis through three articulated rods.This allow s the battery to act as an inertia m ass and dam pen various vibrations w hile the

vehicle is driven.

DAMPENING RODS

AR T-B ATTERY 1


4/23


E46iC BUS SYSTEM

The B us system of the E46iC continues to use the K-B us as the m ain com m unication link

betw een body and driver inform ation m odules. The C onvertible Top M odule (C VM ) is addedto the K-B us for com m unication w ith the G M V for top operation and the Instrum ent C lusterfor diagnostic purposes. The addition of m em ory functions for both outside m irrors hasrequired m em ory m odules to control the operation. These m odules are also connected tothe K -B us for com m unication w ith the S eat M em ory m odule.

As w ith other M R S IIIsystem s, the M R S m odule is now connected to the K -B us for cod-ing/diagnostic and com m unication w ith the other control m odules.

AR T-I46IC B U S


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POWER WINDOWS

Pow er w indow operation has changed w ith the addition of the central pow er w indowsw itch located in the console betw een the w indow sw itches on the left side. The central

sw itch allow s all four w indow s to be opened w ith one touch operation or closed if thesw itch is held.

The balance of the w indow sw itches allow one touch operation for opening. The driver’sw indow sw itch is the only one touch close sw itch due to the elim ination of the anti-trap pro-tection feature.

The pow er w indow s are also opened w hen the top is low ered for approxim ately 1.5 sec-onds to ensure clearance w hen the top is low ered into the storage com partm ent. If the topsw itch is held after opening, the w indow s w ill close again.

AR T-E46IC PO W IN D


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CENTRAL LOCKING

The glove box is integrated into the scope of the central locking system on the E46iC . Anadditional actuator is positioned above the glove box to lock it w henever the central lock-

ing system is activated. Additionally, the trunk is locked out w henever the top storage coveris unlocked w hile the top is being raised or low ered. The top storage cover m otor hall sen-sor signals the G M any tim e the cover is unlocked.

The C VM receives a signal from the G M over the K-B us, w henever the trunk is opened,w hich locks out the soft top operation.

A m icro sw itch on the glove box lock cylinder signals the G M to lock the trunk electricallyfor the valet key position. The trunk can only be opened m echanically w ith either FZV keyor the w allet key.

All other functions of the central locking system rem ain the sam e as the E46 Sedan andC oupe.

The antenna for the FZV system is incorporated w ith the receiver in the interior rear viewm irror.

VA LET LO C K

AR T-E46C EN TRLLO C K


7/23


ANTI-THEFT ALARM DWA

Purpose of the System:

A new design interior sensor is used w ith the D W A system in the E46iC . It allow s the inte-rior of the vehicle to be m onitored w ith either the top raised or low ered. The balance of theD W A system rem ains the sam e as the system used in the C oupes and Sedans. The E46iCuses tw o interior sensors for m axim um vehicle protection.

Components of the System:

SDR Module

The Short D istance R adar (SD R ) sensor is a m otion detector based on m icrow ave tech-

nology. The SD R m odules are located on the drive shaft tunnel under the center console,one sensor in front of the M R S control m odule and the second sensor under the rear ashtray. This central positioning allow s the m ost effective m onitoring of the vehicle’s interior.

The m odules consist of tw oprinted circuit boards w ithone being the transm ittingand receiving aerials and

the other being the pro-cessing electronics. Thehousing of the m odule ism ade from highly conduc-tive m aterial in term s of highfrequency transm ission.

System Operation

The SD R sensor produces and transm its, via the transm itting antenna, an electrom agnet-ic field in a hem ispherical pattern w ithin the vehicles interior. The m onitoring radius is pre-set in the SD R m odule. The receiving antenna m onitors any reflected signals from thistransm ission and the m odule evaluates these signals as a base line for vehicle security. Anyobjects that com e w ithin this m onitoring radius w ith be detected and evaluated by them odule. The m odule w ill then signal the G M to trigger the alarm w arning.

ART-SDR M O DU LE

SDR M odule (C urrently Under D evelopm ent,

N ot Yet Available for The U .S M arket).


8/23


The m odule operates by m eans of a continuous pulse m ode (pulse radar) w hich involvestransm itting a signal, then pausing for the reflected signals to be received by the m odule.

The detection range of the sensor is adjusted by a rapid sw itching process w hen the sys-tem is arm ed. This allow s the sensor to adjust its range to either the w indshield w ith the toplow ered or the soft top w hen it is raised.

The SD R sensor can be sw itched O FF by activating the central locking system tw ice w ith-in 10 seconds as w ith the U IS m otion detector on other D W A system s.

False alarm s m ay be triggered by objects falling into the interior w hen the system is arm edw ith the top low ered.

Large m etal objects w ill shield the m icrow ave transm ission and create a shadow effect inthe interior (for exam ple: the seat back).

AR T-E46IC B O D Y


9/23


ANTI-THEFT ALARM DWA I P O

AR T-E46IC IN TSEN S


10/23


LIGHTING CIRCUITS

The E46iC uses N eon technology for the third brake light w hich is m ounted in the trunk lid.The rem ainder of the exterior lighting circuits carry over from the E46 Sedan and

C oupes.The Electronic brake light sw itch is the input to the LSZ for brake light activation.The LSZ, as an output, provides pow er to the N eon light m odule for activation of the light.The light m odule consists of the ignitor, and N eon tube.

NEONTECHNOLOGY:

N eon (sym bol N e) produces a glow in a vacuum electric-discharge tube and is usedextensively in the fam iliar advertising displays.

A neon light is a glass bulb or tube containing neon (gaseous elem ent) at low pressure,

and tw o m etallic electrodes. To m ake a neon light, the tube is bent w hile w arm ed, to thedesired shape and sealed at both ends. D uring the sealing process, electrodes are addedat each end. An access port is left near one end and a vacuum is applied to the interiorof the tube. After the air and hum idity has been rem oved, the neon gas is added underlow pressure and the tube is sealed.

The light produces a reddish-orange glow w hen an electric current (applied across theelectrodes) is raised in voltage to the point at w hich it ionizes the gas in the tube. Thevoltage at w hich the light glow s varies w ith the design of the tube. W hen the glass tube isionized, the voltage drop across the tube is constant, regardless of the am ount of currentflow ing through the tube. The neon glow s w ith an even intensity throughout the length ofthe tube.

A variant of this is the glass tube containing ionized neon at very low pressure. The tubeshines w ith a brilliant red glow if a high-voltage alternating current is applied to the elec-trodes sealed in the ends of the tube.

34E46THIRD B RA KE0100


11/23


LIGHTING CIRCUITS

The use of neon lighting provides several advantages to autom obile m anufacturers andconsum ers:

•Light failures caused by shock and vibration are m inim ized, because neon operatesw ithout a filam ent.

•The average life of the light is considerably higher as com pared to incandescent bulbs.

•Styling of the light includes a m ore uniform distribution of light across the lens, andneon tubes can be bent to conform to the contour of the vehicle.

•Am ber neon allow s the use of a clear lens (for vehicle color schem es).

•N eon enhances safety because of the extrem ely fast ignition tim e of the light(instantaneous braking signal), allow ing other drivers m ore tim e to react.


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HEATED REAR WINDOW


A new tw o relay system w as designed for the E46iC that supplies pow er to either rear w in-dow defogger grid. The tw o relay system w ill also com m unicates w ith the audio systemam plifier to change the dynam ics of the sound for either top up/hard top installed or topdow n driving


Tw o relays, located on the right side rear quarter panel behind the interior trim cover, areused for rear defroster operation.

•Relay RH H receives KL 30 and theactivation signal from the IH KA controlm odule. The output from the relay w illsw itch the rear defroster O N if the hardtop is installed.

•Relay R H V receives K L 30 from relay

R H H and it supplies the rear defoggergrid in the soft top glass w indow w henthe top is raised. ART-RRW ND W RELAY


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System Operation

The rear defroster operation rem ains a function of the IH KA system w ith the control m od-ule responsible for sw itching the system O N /O FF. Tw o rear defrosted grids are used, one

installed in the soft top rear glass and the other in the optional hard top rear glass.

W hen the button is pressed on the IH KA control panel, R elay R H H is energized. If the hardtop is installed, pow er is supplied to the grid through the connector strip on the hard toplock.

R elay R H H also supplies K L 30 to relay R H V w hen the button is pressed on the IH KA con-trol panel. R elay R H V is energized w hen K L R is sw itched O N and the soft top is closedand locked to the w indshield fram e. This allow s the grid in the soft top to be heated. W henthe soft top is low ered, KL R to relay R H V is interrupted by the C VM to prevent the gridfrom heating w hen the top is low ered into the storage com partm ent.

The H arm on/Karden radio am plifier receives a high signal from relay R H V, w hen the top israised and locked, and the H arm on stereo sound is sw itched O N . If the top is low ered, theam plifier receives a low signal and the stereo sound is sw itched O FF.

RadioAm p12V O V

C onvertible S oft TopC ontrol M odule

C losed & Lockedto Fram e. 12V

O pen & U nlockedfrom Fram eO V

R ear W indow D efrosterC onvertible Top

H eating and A/CC ontrol M odule

Rear W indow D effoggerRelay R H HFor Hard Top

Rear D efrosterRelay RH VFor R ear G lassW indow

AR T-61E46DE FRO ST0200


14/23


AUDIO SYSTEM

The audio system s available for the E46iC correspond to the system s available in the E46C oupe. Tw o radios, w ith either the in dash C D player or cassette player are available. The

navigation system w ith the board m onitor is optional equipm ent. All sound system s are pre-w ired for the optional C D changer that m ounts in the trunk. The sound system s continueto be interconnected on the K-B us and all radio test functions carry over.

84E46N AVG 0000

AR T-B AYERN 1

AR T-B AYERN 2


15/23


HARMAN/KARDEN SOUND SYSTEM

Speaker and com ponent locations w illvary depending on the type of soundsystem installed. Four rear speakers arem ounted in the rear side trim panels, tw oon each side (one w ide band 130 m mand one tw eeter dom e).

The H arm an/Karden system incorpo-rates an additional Subw oofer isinstalled in the trunk in the ski bag cover.The subw oofer is 200 m m diam eterw ithout a subw oofer am plifier. Theam plification for the subw oofer com esfrom the m ain sound system am plifier.

The subw oofer is hinged so that it w illsw ing to the side w hen the ski bag isused. A m agnet on the subw oofer coverw ill hold the subw oofer in place againstthe rear bulkhead w hile the ski bag isbeing used.

The subw oofer w ill continue to functionin either position closed/open.As m entioned , w ith the H arm an/Kardensystem , the stereophonic sound is m od-

ified w hen the top is low ered. The sound system am plifier receives a signal from the rearw indow defroster relay w hen the top is low ered to sw itch the stereophonic sound off.

ART-KT4949

AR T-KT5281

ART-KT5280


16/23


ANTENNAS/DIVERSITY


The E46iC is equipped w ith a diversity antenna system to provide the sound system w iththe strongest possible radio station signal to receive the best perform ance possible fromthe sound system .


The D iversity antenna system on the E46iC consists of:

•M ain antenna m ast - m ounted on the left rear fender.•D iversity antenna - m ounted in the top storage cover.

•M ain antenna am plifier - m ounted directly below the antenna m ast•Auxiliary antenna am plifier - m ounted on the top storage cover.•D iversity sw itching m odule - m ounted below the antenna m ast in the trunk.

The telephone antenna is w ound around the m ain antenna m ast.

AN TEN N A AM PLIFIER

SW ITCHING M O DU LE

AU XILIARY AM PLIFIER

Telephone

H R R adio

ZF R adio

KLR

ART-KT5347


17/23


The second antenna for the FM diversity system is integrated in the convertible top stor-age cover. The FM 2 antenna incorporates a separate am plifier that receives its pow er

through the antenna lead.

System Operation

B oth antennas receive the signals for radio reception. Each signal is am plified by its ow nantenna am plifier and the signals are passed tw o the diversity sw itching m odule. The diver-sity m odule w ill lock onto the stronger of the tw o signals and send it to the radio receiverfor sound system operation.

AUXILIARY ANTENNAAMPLIFIER

AR T-KT-5344

AR T-AN TEM P


18/23


DRIVETRAIN

ENGINE

The M 52 TU - B 25 engine is installed in the E46iC for the first year of production. TheSiem ens M S 42 engine m anagem ent system is used for the engine. The engine carries overfrom the C oupe w ith no changes to the engine or engine m anagem ent system

ART-KT4941


19/23


MS 42 - I P O

KL 15

MEMORY P OWER

AUX KL 31

MAIN KL 31ECMRELAY

CRANKSHAFTP OS ITION SENS OR

OP ERATING P OWER

IGNITION MO NITOR

E46IHKA

K-BUS

ROLLING C ODE

CAMSHAFTP OSITIONSENSOR (2)

KNOCKSENSORS

ENGINE TEMP ERATURE

2X 2XPRE &POST

CATC ONV.

O2 SENSOR

MONITORING

THR OTTLE

P OS ITION

AIRMASS S IGNAL

INTAKEAIRTEMP

OIL TEMP

SENSOR

MDK

VEHICLE SP EED INPU TDS C

LEAKAGE DIAG NOSIS P UMP+

RADIATOR OUTLET

TEMP ERATURE S ENSO R

ECM RELAYCONTROL

FUEL P UMP RELAY CO NTROL

AC C OMPRESSORRELAY CO NTROL

S ECONDARY AIR INJ ECTIONAIR P UMP RELAY CO NTROL

AIRINJ .SOL.

RUNLOSSSOL.

EXHAUS TVANOS S OLENOIDINTAKE VANOS S OLENOID

IDLE C ONTROL VALVE

PRE-CAT(2X)

POS T-CAT(2X)

02 S ENSO R HEATING

IGNITION COILS CONTROL (6X)

DIAG NOSIS

DIS

CANTCM

P

M

OUTP UTS TAGE

P URG E VALVE CO NTROL

INTAKE JET P UMP S OLENOID VALVE

S EQUENTIAL FUEL INJEC TOR C ONTROL (6X)

MDK

MOTOR DRIVEN THROTTLE VALVE

RESO NANCE-TURB ULENCEINTAKE S YS TEM

COMP RESS OR CLUTCH

MAP-C ONTROLLED

HEATED THER MOS TAT

THR OTTLEP OS ITION

(DK)

DS C

ELECTRIC FAN

LEAKAGE DIAGNOS IS

PUMP

+

M

MFL B UTTON P AD

CLUTCH S WITCH

B RAKE LIGHT S WITCHBR AKE LIGHT TES TS WITCH

C AN

I/ O

SIEMENS

MS42.0

E46

M52 TU

134 PINS

SERVICEENGINE SOON

M o D i C

MoDiC

AR T-E46IC IPO


20/23


SUSPENSION SYSTEMS

FRONT SUSPENSION

The single ball joint, strut axle front suspension carries over from the E46 C oupe.It includesthe follow ing features:

•Forged alum inum low er control arm s.•H ydraulic bushings on the rear control arm m ount.•H ollow strut piston rods.•Steering knuckles - press fit to the strut tubes.•Alum inum brake dust shields for w eight reduction.

AR T-KT-4945


21/23


SUSPENSION SYSTEMS

REAR SUSPENSION

The sub-fram e and “C”arm type rear suspension carry over from the E46 C oupe. Thesprings and shock absorbers are adapted for the w eight of the convertible.

A sport suspension is available as an option. The vehicle is low ered by 15m m w ith thesports suspension and the springs, shocks and stabilizer bars are tuned specifically for the

sports option.

The final drive (C om pact H AG 188K) is also carried over from the C oupe.

AR T-KT-4937


22/23


BRAKES

The dual circuit (black/w hite) distribution system continues to be used for optim ized brak-ing response and perform ance. single piston floating calipers are used front and rear.

FRONT BRAKE ROTORS -300 m m diam eter by 20 m m thick - vented

REAR BRAKE ROTORS -294 m m diam eter by 19 m m thick - vented

SLIP CONTROL SYSTEM

The Teves DSC system is used on the E46iC .

AR T-BR AK E

AR T-B R ALES


23/23

23

REVIEW QUESTIONS

1. W hat change w as incorporated into the battery and battery box for usage in the E46iC ?

_____________________________________________________________________________

2. W hat changes have occurred to the Pow er W indow operation for the E46iC ?

_____________________________________________________________________________

_____________________________________________________________________________

3. W hat changes have occurred to the C entral Locking function on the E46iC ?____________________________________________________________________________

____________________________________________________________________________

4. W hat type of signal is produced by the SD R m odule for the D W A system ?

____________________________________________________________________________

5. W hat is the purpose of the tw o relays on the rear defogger circuit of the E46iC ?

_____________________________________________________________________________

_____________________________________________________________________________

6. D escribe the diversity antenna system on the E46iC ?

_____________________________________________________________________________

_____________________________________________________________________________

E46ICBodyElect

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