CRUISE CONTROL WITH ELECTRIC ACTUATOR Group...

CRUISE CONTROL WITH ELECTRIC ACTUATOR

Group 61 - Chassis Electrics

Produced By:

BMW of North America, Inc

Issued 7/83 61-09

CRUISE CONTROL WITH ELECTRIC ACTUATOR

The electric actuator type cruise control system was intro-duced on the BMW 733i and 528e models in 1982. From 1983 allsix-cylinder models will use this type.

The system is designed to operate at between 20 and approximately90 mph. An electronic control unit (E.C.U.) controls anelectric actuator which maintains the desired road speed viathe throttle linkage.

Driver control is through a three-function switch operated bya lever mounted on the right side of the steering column be-hind the wiper lever.

Pushing the lever forward in the CONST position engages thesystem and the car will accelerate until the lever is re-leased. The E.C.U. contains a memory circuit which will holdthe speed that exists when the lever is released from theCONST. position. Momentary operation of the lever in the CONST.position will also cause engagement and lock the prevailingspeed into the memory.

Cruise control may be disengaged in any of five differentways; momentarily moving the control switch up or down to OFF,applying the foot brake, shifting the automatic transmission toneutral, depressing the clutch, or whenever the actual speeddrops more than 15 mph below the memory speed.

Following disengagement, the car can be returned to the pre-viously selected speed by pulling the control lever to RESUME.

The memory circuits in the E.C.U. are reset whenever thelever is moved to CONST, but the only time the memory is clearedis when ignition is turned off.

The E.C.U. receives a processed signal from the electronicspeedometer, which is equivalent to actual road speed. Con-sequently, speedometer problems will affect cruise control.

ACTUATOR

CLUTCH SWITCH BRAKE SWITCH

CRUISE CONTROL SCHEMATIC

(ELECTRIC ACTUATOR)

OFF

61-09/1

CABLE

GAS LINKAGE

BRIDGE

(AUTOMATIC)

ECU

SPEEDO

OFF

REED SWITCH

RESUME

CONST.

R N D 2 1P

CRUISE CONTROL SYSTEM TESTS

(ELECTRIC ACTUATOR)

Use BMW Service Test 2013 to check function of system

as follows:

Program: Enter M (Multimeter)Enter 13 (Frequency out)Enter 110 (Hz)PressEnter 02 (U. AC.)Press

1. Detach the differential reed switch plug and attach frequencyout (+) to brown/red wire and frequency out (-) to brownwire.

2. Turn on ignition.

3. Speedometer should show approximately 50 mph.

4. Engage cruise control and monitor the actuator. (It shouldpull the throttle open.)

5. If cruise control does not engage, check for A.C. voltage onE.C.U. plug terminal # 6 . (It should be approximately 4.0volts.)

6. Check plug connections on back of instrument cluster.

7. If system is still inactive, perform the following tests:

Test at ECU Plug Component/Circuit Result

1. Ignition on—check volt-age at Terminal #1.

Power supply 12 Volts. If not, checkwiring and fuse.


Control switch OFF Move lever to OFF. Voltagedrops from 12V to 0V. Ifnot, check wiring andswitch.


Control switch CONST. Move lever to CONST.Voltage jumps 0 to 12V.If not, check wiring andswitch.

61-09/2

Test at ECU Plug Component/Circuit Result


Control switch RESUME. Move lever to RESUME.Voltage jumps 0 to 12V.If not, check wiring andswitch.

5. Measure resistance Term-inal #3 to ground. (Autotransmission in neutral.)(Ignition off.)

A.) Automatic Trans-mission

B.) Manual Trans-mission

A.) Approximately 4B.) < 1

6. Apply voltage to term.#8 and ground term. #9.

Actuator solenoid(Clutch)

Listen for click in actuator

7. Measure resistanceTerminal #8 to ground.

Actuator and clutchswitch.

Resistance approx. 30Press clutch pedal, thenresistance = ooIf not, check wiring, clutchswitch, and brake lights.

8. Apply voltage to term.#13 and ground term. #25.

Actuator motor Listen for motor running.

9. Measure resistanceTerminal #24 to Terminal#23.

Actuator potentiometer. Resistance approx. 3000If not, check wiring/replace actuator.


Ground Resistance = 0If not, check wiring andground.


Actuator. Resistance approx. 3000If not, check wiring/replace actuator.

12. Measure voltage atterm. #9 (Ignition on)

Brake light switch 0 Volts then depress brakepedal voltage = 12V.

61-09/3

FOR CRUISE CONTROL TO BE E N G A G E DPIN 9 MUST SENSE GROUND THROUGHSTOPLIGHTS.WHEN BRAKE SWITCH IS CLOSED ORCLUTCH SWITCH IS OPEN, GROUND ISELECTRONICALLY REMOVED.

CRUISE CONTROL ELECTRICAL SCHEMATIC

BRAKE

SWITCH

C L O S E D WITH BRAKEPEDAL DEPRESSED

POWER

DISTRIBUTION

BOX

CLUTCH

SWITCH

OPENS WHENCLUTCH P E D A LIS DEPRESSED

POWERDISTRIBUTION

BOX

AUTOMATIC

TRANSMISSION

RANGE SWITCH

AUTOMATIC TRANSMISSION

CRUISE

CONTROL

SWITCH

C210

CRUISE CONTROL

CONTROL UNIT

TRANSMISSION

RANGE

DISPLAY

T O T H R O T T L E

VALVE

FEEDBACK

POTENTIOMETER

INSTRUMENT

CLUSTER

CRUISE

CONTROL

A C T U A T O RCLUTCH

SOLENOID

CANCEL RESUME ACCELERATE/SPEED SET SPEED

CONTROL INPUTS

INSTRUMENT

CLUSTER

MANUAL

TRANSMISSION

IDLE

SPEED

CONTROL

FUSE 6

8 AMP

POWER

DISTRIBUTION

POWER

DISTRIBUTION

ACCELERATE/SETOFF RESUMEOFF

S217 C206 S309 C301

.75 GN/WT

.5 VI/WT C210 GN/WT

CLUTCH CONTROL CONTROL MOTOR CRUISEOUTPUT OUTPUT ENABLE

SEE DASH LIGHTS

GROUND

"N"

OUTPUTBAND

1.5 GN/WT 1 GN/WT 11 1 GN/WT .75 GN/WT

.75 GN/WT

1

.75 8U/3R

.75 BU/BR

S234

3

15

1

2

D

6

N

R

PSW0

GN BU

. 5 YL .5 GN .5 BU45

SPEEDOMETER

SOLID STATE

2 C8

.5 BU/YLCRUISE CONTROL

CONTROL UNIT

POWER INPUT

.5 VI/WTC250

STOP LIGHTS

.5 GN/RD

. 5 G N / R D

MANUAL

TRANSMISSION

AUTOMATIC

TRANSMISSIONC208

.5 GN/RD

C208

61

-0

9/5

S224

.5 GN/RD

.5 GN/RD

9

G200

.5 BR

SPEEDOMETER

.5 VI/WT

1.5 VI/WT

S241

FUSE 128 AMP

.5 VI/WT

VEHICLE SPEEDINPUT

CRUISEENABLE

.75

BU/BR

C8

GROUNDFEEDBACKREFERENCE

FEEDBACKINPUT

SOLID STATE

24 26

.5 GY/RD .5 GN/YL

4

.5 RD

7

.5 YL

.5 BR

3S233

(-)

12

16 C1

C6

.5 BR

.5 BR

G200

.5 BR

.75 BU/BR

6

7

.75 BU/BR

.5 BU

C209

.5 BU/WT

2

3

G200

13

.5 BK

5

.5 BK.5 GN

.5 WT

.5 WT

CONTROLMOTOR

1

CRUISE CONTROL WITH VACUUM SERVO

Group 61 - Chassis Electrics

Produced by

BMW OF NORTH AMERICA, INC.

Revised 7/83 61-08

CRUISE CONTROL

The BMW cruise control is designed to operate between 20and approximately 90 mph. An electronic control unit (E.C.U.)controls a vacuum operated servo unit which actuates thethrottle linkage to maintain the required road speed.

Drive control is through a three function switch operatedby a lever mounted on the right side of the steering columnbehind the wiper lever.

Pushing the lever forward in the CONST position engages thesystem and the car will accelerate until the lever isreleased. The E.C.U. contains a memory circuit which willhold the speed that exists when the lever is released fromthe CONST position. Momentary operation of the lever in theCONST position will also cause engagement and lock theprevailing speed into the memory.

Cruise control may be disengaged in any of five differentways: momentarily moving the control switch up or down toOFF, applying the foot brake, shifting the transmission toneutral, or whenever the actual speed drops more than 7 mphbelow the memory speed.

Following disengagement, the car can be returned to thepreviously selected speed by pulling the control lever toRESUME.

The memory circuits in the E.C.U. are reset whenever thelever is moved to CONST but the only time the memory iscleared is when ignition is turned off.

SPEEDO CABLE

SIGNAL GENERATOR

OFF

CONST.

CRUISE CONTROL SCHEMATIC

61-08/1

SERVOCABLE

VACUUMVENT

GAS LINKAGE

BRAKE SWITCH

P R N D 2 1

ADAPTER

ECU

RESUME

OFF

REED SWITCH

SPEEDO

CRUISE CONTROL SYSTEM TESTS - 733i (VACUUM SERVO)

A. Vacuum - Check fit and condition of all vacuum and vent lines.

B. Electrical

TEST AT ECU PLUG COMPONENT/CIRCUIT RESULT

1. Measure resistanceacross term. 1-12push car min. 2 feet

Reed switch in differen-tial and wiring.

Resistance changes 0 to ooto 0, etc. If not, checkwiring and switch.

2. Ignition on. Checkvoltage at term. 5.

Power supply. Voltage - 12V. If not, checkwiring.

3. Start car. Jumperterm. 5 - 3 and then12-7 momentarily.

Servo Servo should activate and raiseengine speed. If not, checkwiring and Servo.

4a. Ignition on (notrunning). Checkvoltage at term. 6.

b. Ignition off. Checkresistance terminal 6to ground.

System disconnectcircuit.

Adaptor ground.

No voltage. Push brake pedalthen voltage = 12V, or trans.to 'N' and voltage = 12V. Ifnot, check wiring, switches,and adaptor.Reading approx. 20 to 150Now reverse leads and readingmust remain between 20 and1 5 0 . If reading is at oowith either hook up checkadaptor grounding or replaceadaptor.


Control switch OFF. Move lever to OFF. Voltagedrops from 12 -> 0 volts. Ifnot, check wiring and switch.


Control switch CONST. Move lever to CONST. Voltagejumps 0 to 12 volts. If not,check wiring and switch.


Control switch RESUME Move lever to RESUME. Voltagejumps 0 to 12 volts. If not,check wiring and switch.

If these electrical tests are OK, then change the control unit if the system does notoperate correctly.

61-03/2

CRUISE CONTROL ELECTRICAL SCHEMATIC 733IA61-08/3

G N - g r e e n BR-b rownWS-whi t e RT-redB L - b l u e VI -v io l e tG E - y e l l o w

1. Control Unit (ECU) 5. Adaptor 9. Fuses2. Reed Switch 6. Trans. Lights (Instruments) 10. Relief Relay3. Servo 7. Brake Switch 11. Ignition Switch4. Control Switch 8. Brake Light 12. Battery

CRUISE CONTROL SYSTEM TESTS - 633CSi (VACUUM SERVO)

A, Vacuum - Check fit and condition of all vacuum and vent lines.

B. Electrical

TEST AT ECU PLUG COMPONENT/CIRCUIT RESULT

1. Measure A/C voltageacross terms. 11-12.Car on hoist in gearand running.

Signal Generator andwiring.

10 mph approx. 0.7 V A/C20 mph approx. 1.4 V A/C30 mph approx. 2.1 V A/C40 mph approx. 2.8V A/C


Power supply. Voltage - 12V. If not,check wiring.

3. Start car. Jumperterm. 5 - 3 and then12-7 momentarily.

Servo. Servo should activate andraise engine speed. Ifnot, check wiring and Servo.

4a. Ignition on (notrunning). Checkvoltage at term. 6.

b. Ignition off. Checkresistance terminal6 to ground.

System disconnectcircuit.

Adaptor ground.

No voltage. Push brake pedalthen voltage = 12V, or trans.to 'N' and voltage = 12V. Ifnot, check wiring, switches,and adaptor.Reading approx 20 to 150 .Now reverse leads and readingmust remain between 20 and 150If reading is at oo with eitherhook up check adaptor groundingor replace adaptor.


Control switch OFF. Move lever to OFF. Voltagedrops from 12 -> 0 volts. Ifnot, check wiring and switch.


Control switch CONST. Move lever to CONST. Voltagejumps 0 to 12 volts. If not,check wiring and switch.


Control switch RESUME. Move lever to RESUME. Voltagejumps 0 to 12 volts. If not,check wiring and switch.

If these electrical tests are OK, then change the control unit if the system does notoperate correctly.

61-08/4

CRUISE CONTROL ELECTRICAL SCHEMATIC 633CSiA61-08/5

1. Control Unit (ECU) 5. Control Switch 9. Fuses2. Signal Generator 6. Battery 10. Relief Relay3. Ignition Switch 7. Adaptor 11. Brake Light4. Servo 8. Trans. Lights 12. Brake Switch

GN-green BR-brownW S - w h i t e RT- redBL-b lue V I - v i o l e t

G E - y e l l o w

CRUISE CONTROL VACUUM SERVO

THROTTLE LINKAGE

NIPPLE

l-2mm

VENTVACUUM

ELECTRIC

SOLENOID

CRUISE CONTROL WITH ELECTRIC ACTUATOR Group...

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