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Test readings, control module connections

Test readings, control module connections




Scope

Nominal values and instructions for measuring voltages on the module are specified below under the respective headings.

Remember


Note the test conditions and use common sense when assessing the test result.

The nominal values specified apply with the ignition in the ON position unless otherwise stated.

First check that the control module has a power supply and is grounded.

Then check all sensor inputs and signals from other systems.

finally, check the outputs. Remember that the test results do not tell us whether or not the module is functioning properly.

If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.

The specified test readings refer to those obtained with a calibrated Fluke 88/97.

Test readings in % (+) and ms (+) show the pulse ratio and pulse duration of the signal. A test instrument capable of giving pulse ratio and pulse width readings must be used. The sign indicates a positive trigger pulse, TRIG+.



Control module connector


> = greater than; < = less than; » = approx. equal to; ~ = AC voltage (LP: LOGIC PROBE P = select pulse; p = visible pulses)

Pin No.

Cable colour

Component/

function

In/Output

Test conditions

Across

Test reading

See

1

YE/RD

Brake light right-hand, power supply from TWICE to lamp bulb.

Out

Brake pedal pressed.

1-B-

B+

Lighting and signalling systems



2

YE

Tailgate relay, 5D, ground

Out

Lock tailgate

B+-2

B+

Doors and locks



3

GN/WH

Electrically adjustable passenger seat, ground relay.

Out

Ignition ON

3-B-

approx. 1 V

Seats











Ignition OFF. Front doors closed.

Not operated.

3-B-

B+



4

BU/WH

Starter relay, ground

Out

Ignition key in position ST.

Transponder not OK.

4-B-

B+











Ignition key in position ST.

Transponder OK.

4-B-

<0.5V



5

LHD: GN/WH

RHD: GN/WH

Seat sensor, passenger seat.

In

Passenger seat occupied.

5-21

<4.2V

Seat belt system









Passenger seat unoccupied.

5-21

5V



6

BU/RD

Locking switch for central locking, centre console.

In

Ignition ON

6-B-

B+ for approx. 0.5 sec.

Doors and locks



7

BN/RD

Unlocking switch for central locking, centre console.

In

Ignition ON

7-B-

B+ for approx. 0.5 sec.

Doors and locks



8



No connection











9

GN/BK

Heated rear seat, request.

In

Ignition ON:

Button for rear seat heater held down.

9-B-

B+

Seats



10

RD/WH

Glass breakage sensor and tilt sensor, power supply.

Out

Sensor not disconnected.

Anti-theft alarm armed.

10-B-

B+

Glass breakage sensor (4D)



Glass breakage sensor (5D)



Angle sensor



11

YE

Switch, unlocking boot lid/tailgate

In

Ignition ON

11-B-

B+ for approx. 0.5 sec.

Doors and locks

4D



5D



12

YE/WH

Door switch, left-hand rear door.

In

Ignition ON:

Door closed.

12-B-

B+ for approx. 0.5 sec.





13

VT/WH

Receiver remote control, ground.

In

Always

B+ -13

13-B-

B+

<0.5V





14

YE/BN

Remote control receiver, anti-theft alarm, signal.

In

Remote control not operated.

14-B-

B+









Press lock button.

14-B-

approx. 6V for approx. 0.2 sec.



15

WH

I-bus (-)



In/Out

Ignition ON:

Bus active

15-B-

2-3V



16

BU/RD

Ignition +15, logic.



In

Ignition ON

16-B-

B+

TWICE



17

OG

Ignition +B, logic

In

Ignition ON:

Key in ignition lock

17-B-

B+

TWICE



18

LHD: BU/RD

RHD: BN/WH

Seat belt contact, driver's side.

In

Ignition ON:

Seat-belt on driver's side not connected to buckle

18-B-

<0.5V

Seat belt system



Seat belt fastened



18-B-

B+





19

GN

Tilt sensor signal.

In

Ignition ON

19-B-

1.0V



20

RD/WH

Central locking motors rear doors, control voltage for theft security locking

Out

Not operated

B+ -20

B+

Doors and locks



Lock the car.

Activate function with diagnostic tool.

20-B-

B+ -20

B+

<1V



21

GN/WH

Seat sensor passenger seat, ground.



Out

Ignition ON

B+ -21

B+

Seat belt system



22

BU/GN

Central locking motors doors, control voltage for locking

Out

Not operated

B+ -22

B+

Doors and locks



Car to be unlocked.

Activate function with diagnostic tool.

22-B-



B+ -22

B+



<1V



23

GN

Parking light left rear, power supply from switch.

In

Light switch in position for parking light (pos 1).

23-B-

B+

Lighting and signalling systems



24

RD/BK

High level brake light, power supply from TWICE to bulb.

Out

Brake pedal pressed.

24-B-

B+

Lighting and signalling systems



25

GY/RD

Brake light left-hand, power supply from TWICE to bulb.

Out

Brake pedal pressed.

25-B-

B+

Lighting and signalling systems



26

BK/GN

Central locking motor driver's door, control voltage for unlock

Out

Not operated

B+ -26

B+

Doors and locks





Car to be unlocked.

Activate function with diagnostic tool.

26-B-



B+ -26

B+



<1V



27

GN/YE

LED, theft protection.

Out

Activate function with diagnostic tool

B+ -27

approx. 1.95 V





28

BK/VT

Seat belt warning lamp, ground.

Out

Ignition ON

28-B-

<1V for 6 sec.

Seat belt system







Seat belt buckled more than 6 seconds since ignition was switched ON.

28-B-

B+



29

GN/YE

Siren, communication



Out

Ignition ON

29-B-

B+



30



No connection











31



No connection











32



No connection













33

BU/YE

Unlock with key in driver's door.



In

Ignition ON

B+ -33

approx. 8V for 0.5 sec

Doors and locks



34

BN/WH

Tilt sensor, ground

In

Always

B+ -34

34-B-

B+

<0.5V





35

GN/GY

Boot lid/tailgate switch.

In

Ignition ON:

Tailgate closed.

35-B-

B+ for approx. 0.5 sec.











Tailgate open.

35-B-

<0.1V





36

GN

Door switch; right-hand rear door.

In

Ignition ON:



Door closed.

36-B-

B+ for approx. 0.5 sec.













Door open.

36-B-

<0.1V





37

BK

Signal ground



In

Always.

B+ -37

37-B-

B+

<0.5V



TWICE



38

GN

I-bus (+)



In/Out

Ignition ON:

Bus active

38-B-

2-3V



39

YE/BN

Immobiliser; code from antenna unit via ignition lock.

In

Ignition ON

39-B-

B+













Ignition OFF.

B+ -39

<0.1V





40



No connection











41

BU

Bonnet switch

In

Ignition ON:

Bonnet closed.

41-B-

B+ for approx. 0.5 sec.











Bonnet open.

41-B-

<0.1V







42

BN/GN

Central locking motor driver's side, control voltage for theft security locking.

Car to be locked.

Out

Not operated

B+ -42

B+

Doors and locks





Activate function with diagnostic tool

42-B-



B+ -42

B+



<1V





43

RD

TWICE, power supply +30 circuit.

In

Always +30

43-B-

B+ -43

B+

<0.5V



TWICE



44

GY

Central locking system motor tailgate 5D, control voltage, theft security locking

Out

Not operated

B+-44

B+

Doors and locks





Activate TSL

44-B-

B+-44

B+

<1V



45

GN

Parking light left-hand rear, power supply from TWICE to bulb.

Out

Light switch in position for parking light (pos 1).

45-B-

B+

Lighting and signalling systems



46

BU

Parking light right-hand rear, power supply from TWICE to bulb.

In

Light switch in position for parking light (pos 1).

46-B-

B+

Lighting and signalling systems



47

RD

Central locking, power supply from fuse.

In

Always +30.

Activate any central locking function.

47-B-

B+ -47

B+

<1V



Doors and locks



48

GN/GY

Brake light, power supply from brake light contact.

In

Brake pedal pressed.

48-B-

B+

Lighting and signalling systems



49

GN/YE

Central locking motors rear doors, control voltage for unlocking.

Out

Not operated

B+ -49

B+

Doors and locks









Activate function with diagnostic tool

49-ground

B+ -49

B+

<1V





50

GN

Antenna unit for immobiliser; power supply.

Out

Ignition ON:

Without transponder

50-B-

B+ for approx. 10 sec.













Ignition ON:

With transponder

50-B-

B+ for approx. 0.1 sec.





51

WH

Tailgate. 5D





Always

51-B-

B+-51

B+

<1V

Doors and locks



52

GN

Heated rear seat, relay.

Out

Activate with diagnostic tool.

52-B-

approx. 1 V



Seats









Not operated

52-B-

B+





53



No connection











54



No connection











55

BU/RD

Locking button, driver's door.



In

Ignition ON:

Locking button up.



55-B-



0V



Doors and locks











Locking button down.

55-B-

B+ for approx. 0.5 sec.



56

BK/WH

Locking with key in driver's door.

In

Ignition ON



56-B-

8V for approx. 0.5 sec.

Doors and locks













Key in door lock in locked position.

56-B-

0V





57

BU/RD

Glass break sensor, ground

In

Always

B+ -57

57-B-

B+

<0.5V





4D

LINK,

5D



58

BU/YE

Glass break sensor, signal

In

Ignition ON

58-B-

B+ for approx. 0.5 sec.



4D



5D



59

BU

Boot lid/tailgate switch for disarming anti-theft alarm.

In

Ignition ON:

Not operated

59-B-

B+ for approx. 0.5 sec.











Turn the key to the unlocked position.

59-B-

<0.1V



60

GN/BU



Door switch passenger door, front

In

Ignition ON:

Door closed.



60-B-

B+ for approx. 0.5 sec.









Door open



60-B-

<0.1V



61

BU/RD



Door switch, driver's door

In

Ignition ON:

Door closed.



61-B-

B+ for approx. 0.5 sec.









Door open



61-B-

<0.1V



62

BK/WH

Boot lid/tailgate lock motor, ground.

In

Always

B+-62

62-B-

B+

<0.1V

Doors and locks



63



No connection











64



No connection















65

LHD: BN/RD

RHD: BU/WH

Seat belt switch, passenger side

In

Ignition ON:

Seat belt on passenger side not connected to buckle



65-B-

<0.5V

Seat belt system







Belt fastened



65-B-

B+



66

GN/BK

Central locking motor passenger side front, control voltage for theft security locking

Out

Not operated

B+ -66

B+

Doors and locks









Lock the car.

Activate function with diagnostic tool

66-B-

B+ -66

B+

<1V



67

GN/WH

Central locking system motor boot lid/tailgate, control voltage

Out

Not operated

B+ -67

B+

Doors and locks









Activate function with diagnostic tool

67-B-

B+ -67

B+

<1V



68

BU

Parking light right-hand rear, power supply from TWICE to bulb.

Out

Light switch in position for parking light (pos 1).

68-B-

B+

Lighting and signalling systems



69

VT/WH

Central locking motor passenger door front, control voltage for unlock

Out

Not operated

B+ -69

B+

Doors and locks









Activate function with diagnostic tool

69-B-

B+ -69

B+

<1V



70

BK

Power ground TWICE



In

Always.

Operate central locking function

B+ -70

70-B-

B+

<0.3V

TWICE