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Measured values, control module connections

Measured values, control module connections




Scope

Nominal values and instructions for measuring voltages on the control module can be found under the respective headings below.

Remember


Note the measuring conditions and use common sense when assessing the results.

The nominal values shown apply with the ignition switched ON unless otherwise stated.

First, check that the power supplies to the module are correct and that it is grounded properly.

Then check all the sensor inputs and signals from other systems.

Finally, check the outputs. Remember that the measured values do not tell us whether or not the module is functioning properly.

If a measured value is incorrect, investigate which leads, connectors or components should then be checked, using the wiring diagram.

The nominal values shown below apply when using a calibrated Fluke 88/97.

The values % (+) and ms (+) show the pulse ratio and pulse duration of the signal. The test instrument used must be able to measure pulse ratio and pulse width. The (+) sign denotes 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.

Component/

function

In/out

Test conditions

Measure across

Test value

See

1

Brake light right-hand, voltage measurement from TWICE to lamp bulb.

Out

Brake pedal depressed.

1-B-

B+

Lighting and signalling systems



2

Tailgate, relay. 5D, ground

Out

Lock tailgate

B+-2

B+

Doors and locks



3

Electric powered passenger seat, relay ground.

Out

Ignition ON

3-B-

approx. 1V

Seats









Ignition OFF. Front doors closed.

Not affected.

3-B-

B+



4

Starter relay, ground.

Out

Ignition switch in ST position.

Transponder not OK.

4-B-

B+

Theft protection









Ignition switch in ST position.

Transponder OK.

4-B-

<0.5V



5

Seat sensor, passenger seat.

In

Passenger seat occupied.

5-21

<4.2V

Seat belt system









Passenger seat not occupied.

5-21

5V



6

Switch, locking central locking, centre console.

In

Ignition ON.

6-B-

B+ for approx. 0.5 sec.

Doors and locks



7

Switch, unlocking central locking, centre console.

In

Ignition ON.

7-B-

B+ for approx. 0.5 sec.

Doors and locks



8

No connection.











9

Heater pad rear seat, request.

In

Ignition ON:

Pushbutton rear seat heater pad kept depressed.

9-B-

B+

Seats



10

Glass breakage sensor and angle sensor, power supply.

Out

Sensor not disconnected.

Anti-theft alarm armed.

10-B-

B+

Theft protection

4D

5D

11

Switch, unlocking boot lid/tailgate

In

Ignition ON.

11-B-

B+ for approx. 0.5 sec.

Doors and locks

4D

5D

12

Door switch, left-hand rear door.

In

Ignition ON:

Door closed

12-B-

B+ for approx. 0.5 sec.



Theft protection



13

Receiver remote control, ground.

In

Always

B+ -13

13-B-

B+

<0.5V



Theft protection



14

Receiver, remote control, anti-theft alarm, signal.

In

Remote control not affected.

14-B-

B+

Theft protection







Press in locking button.

14-B-

approx. 6V for approx. 0.2 sec.



15

I-bus (-)



In/Out

Ignition ON:

Bus active

15-B-

2-3V



16

Ignition +15, logic.



In

Ignition ON.

16-B-

B+



17

Ignition +B, logic.

In

Ignition ON:

Key in ignition switch

17-B-

B+



18

Not used











19

Angle sensor signal.

In

Ignition ON

19-B-

1.0V

Theft protection



20

Central locking motors rear doors, control voltage anti-theft protection locking

Out

Not affected

B+ -20

B+

Doors and locks



Lock the car.

Then activate the function with the diagnostic tool.

20-B-

B+ -20

B+

<1V



21

Seat sensor passenger seat, ground.



Out

Ignition ON.

B+ -21

B+

Seat belt system



22

Central locking motors doors, control voltage locking

Out

Not affected

B+ -22

B+

Doors and locks



The car must not be locked.

Then activate the function with the diagnostic tool.

22-B-



B+ -22

B+



<1V



23

Parking light left-hand rear, power supply from switch.

In

Light switch in parking light position (pos 1)

23-B-

B+

Lighting and signalling systems



24

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

Out

Brake pedal depressed.

24-B-

B+

Lighting and signalling systems



25

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

Out

Brake pedal depressed.

25-B-

B+

Lighting and signalling systems



26

Central locking motor driver's door, control voltage unlocking

Out

Not affected

B+ -26

B+

Doors and locks





The car must not be locked.

Then activate the function with the diagnostic tool.

26-B-



B+ -26

B+



<1V



27

LED, anti-theft protection

Out

Activate function with diagnostic tool.

B+ -27

approx. 1.95V

Theft protection



28

Seat belt warning lamp, ground.

Out

Ignition ON

28-B-

<1V for 6 secs.

Seat belt system







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

28-B-

B+



29

Siren, communication



Out

Ignition ON.

29-B-

B+

Theft protection



30

No connection.











31

No connection.











32

No connection.













33

Unlocking with key in driver's door.



In

Ignition ON.

B+ -33

approx. 8V for 0.5 sec

Doors and locks



34

Angle sensor, ground.

In

Always

B+ -34

34-B-

B+

<0.5V



Theft protection



35

Boot lid/tailgate switch.

In

Ignition ON:

Tailgate closed.

35-B-

B+ for approx. 0.5 sec.



Theft protection







Tailgate open.

35-B-

<0.1V





36

Door switch; right-hand rear door.

In

Ignition ON:



Door closed.

36-B-

B+ for approx. 0.5 sec.



Theft protection









Door open.

36-B-

<0.1V





37

Signal ground.



In

Always.

B+ -37

37-B-

B+

<0.5V





38

I bus (+)



In/Out

Ignition ON:

Bus active.

38-B-

2-3V



39

Immobilization; code from antenna unit near ignition switch.

In

Ignition ON.

39-B-

B+



Theft protection







Ignition OFF.

B+ -39

<0.1V





40

No connection.











41

Bonnet switch.

In

Ignition ON:

Bonnet closed.

41-B-

B+ for approx. 0.5 sec.

Theft protection







Bonnet open.

41-B-

<0.1V







42

Central locking motor driver's door, control voltage, anti-theft locking.

The car must be locked.

Out

Not affected

B+ -42

B+

Doors and locks





Activate function with diagnostic tool.

42-B-



B+ -42

B+



<1V





43

TWICE, power supply +30.

In

Always +30

43-B-

B+ -43

B+

<0.5V





44

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

Out

Not affected

B+-44

B+

Doors and locks





Activate TSL

44-B-

B+-44

B+

<1V



45

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

Out

Light switch in parking light position (pos 1)

45-B-

B+

Lighting and signalling systems



46

Parking light right-hand rear, power supply from switch.

In

Light switch in parking light position (pos 1)

46-B-

B+

Lighting and signalling systems



47

Central locking, power supply from fuse.

In

Always +30.

Activate any central locking function.

47-B-

B+ -47

B+

<1V



Doors and locks



48

Brake light, power supply from brake light switch.

In

Brake pedal depressed.

48-B-

B+

Lighting and signalling systems



49

Central locking motors rear doors, control voltage unlocking.

Out

Not affected

B+ -49

B+

Doors and locks







Activate function with diagnostic tool.

49-ground

B+ -49

B+

<1V





50

Antenna unit immobilization; power supply.

Out

Ignition ON:

Without transponder

50-B-

B+ for approx. 10 secs.



Theft protection









Ignition ON:

With transponder

50-B-

B+ for approx. 0.1 secs.





51

Tailgate. 5D Locking



Out

Always

51-B-

B+-51

B+

<1V

Doors and locks

52

Electric heater rear seat, relay.

Out

Activate with diagnostic tool.

52-B-

approx. 1V



Seats







Not affected

52-B-

B+





53

No connection.











54

No connection.











55

Lock button, driver's door.



In

Ignition ON:

Lock button up.



55-B-



0V



Doors and locks









Lock button down.

55-B-

B+ for approx. 0.5 sec.



56

Locking with key in driver's door.

In

Ignition ON.



56-B-

8V for approx. 0.5 secs.

Doors and locks











Key in door lock in locked position.

56-B-

0V





57

Glass breakage sensor, ground.

In

Always

B+ -57

57-B-

B+

<0.5V



Theft protection

4D

5D

58

Glass breakage sensor, signal.

In

Ignition ON.

58-B-

B+ for approx. 0.5 sec.

Theft protection

4D

5D

59

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

In

Ignition ON:

Not affected

59-B-

B+ for approx. 0.5 sec.

Theft protection







Turn key to unlocked position.

59-B-

<0.1V



60

Door switch passenger door, front

In

Ignition ON:

Door closed.



60-B-

B+ for approx. 0.5 sec.

Theft protection







Door open.



60-B-

<0.1V



61

Door switch, driver's door

In

Ignition ON:

Door closed.



61-B-

B+ for approx. 0.5 sec.

Theft protection







Door open.



61-B-

<0.1V



62

Boot lid/tailgate lock motor, ground.

In

Always

B+-62

62-B-

B+

<0.1V

Doors and locks



63

No connection.











64

Seat-belt switches, rear seat

In

Ignition ON:

Belts in rear seat not fitted into seat-belt buckles



64-B-

<0.5V

Seat belt system









Seat belt buckled

64-B-

B+







65

Not used











66

Central locking motor passenger door front, control voltage, anti-theft locking.

Out

Not affected

B+ -66

B+

Doors and locks







Lock the car

Activate function with diagnostic tool.

66-B-

B+ -66

B+

<1V



67

Central locking system motor boot lid/tailgate, control voltage

Out

Not affected

B+ -67

B+

Doors and locks







Activate function with diagnostic tool.

67-B-

B+ -67

B+

<1V



68

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

Out

Light switch in parking light position (pos 1)

68-B-

B+

Lighting and signalling systems



69

Central locking motor passenger door front, control voltage unlocking.

Out

Not affected

B+ -69

B+

Doors and locks







Activate function with diagnostic tool.

69-B-

B+ -69

B+

<1V



70

Power ground TWICE



In

Always.

Operate central locking function.

B+ -70

70-B-

B+

<0.3V