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Test readings, control module connections

Test readings, control module connections




Scope

The following pages give readings and instructions for measuring voltage levels on control modules.

Remember


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

The specified test readings are with the ignition ON, 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 control module outputs. Remember that the test readings do not indicate whether the actuator is working.

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 duration readings must be used. The (+) sign indicates a positive trigger pulse, TRIG+.



Control module connection


> =greater than ; < = less than ; ~ = alternating current (LP: LOGIC PROBE P = select pulse ; p = visible pulses)

Pin No.

Cable colour

Component/

function

In/Out

Test conditions

Across

Test reading

See

1

YE/WH

Right brake light, power supply from TWICE to bulb.

Out

Brake pedal pressed.

1-B-

B+

Lighting and signalling systems



2

GY



Central locking system motor for luggage compartment lock, relay.

Out

Not operated



2-B-

B+

Doors and locks















Activate function with diagnostic tool.

B+ -2

B+



3

BU/YE

Electrically adjustable passenger seat, relay ground.

Out

Ignition ON

3-B-

approx. 1V

Seats









Ignition OFF. Front doors closed.

Not operated

3-B-

B+



4

BN



Starting relay



Out

Ignition key in position ST.

Transponder not OK.

4-B-

B+

Theft protection

















Ignition key in position ST.

Transponder OK.

4-B-

<0.5V



5

BN/WH

Seat sensor, passenger seat.

In

Passenger seat occupied.

5-21

<4.2V

Seat belt system















Passenger seat unoccupied.

5-21

5V



6

YE/GY

Locking switch for central locking, centre console.

In

Ignition ON

6-B-

B+ for approx. 0.5 sec.

Doors and locks



7

YE/BN

Unlocking switch for central locking, centre console.

In

Ignition ON

7-B-

B+ for approx. 0.5 sec.

Doors and locks



8

BU/BN

Unlocking with key in passenger door.



In

Ignition ON

B+ -8

B+ for approx. 0.5 sec.

Doors and locks



9

BN

Heated rear seat, request.

In

Ignition ON:

Heated seat button held down.



9-B-

B+

Seats





10

RD

Glass breakage sensor and tilt sensor, power supply.

Out

Sensor not disconnected.

Anti-theft alarm armed.

10-B-

B+

Theft protection





11

RD/WH

Switch for unlocking tailgate/boot lid.

In

Ignition ON

11-B-

B+ for approx. 0.5 sec.

Doors and locks



12

BK/GN

Door switch, left rear door.

In

Ignition ON:

Door closed.



12-B-

B+ for approx. 0.5 sec.



Lighting and signalling systems



Theft protection



13

BK

Antenna for remote control, ground

In

Always

B+ -13

B+



Theft protection











13-B-

<0.5V



14

BN

Antenna for remote control, signal.



In

Remote control not operated.

14-B-

B+

Theft protection











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

YE/GY

Ignition +15, logic.



In

Ignition ON

16-B-

B+



17

3D/5D:

BN/RD

CONV:

RD/BN

Ignition +B, logic

In

Ignition ON:

Key in ignition switch



17-B-

B+



18

LHD:

BU/RD

LHD/

CONV: RD/BK

RHD:

RD/BK

Seat belt switch, driver's side.

In

Ignition ON:

Seat belt on driver's side not buckled



18-B-

<0.5V

Seat belt system









Seat belt buckled



18-B-

B+



19

BU/RD

Tilt sensor signal.

In

Ignition ON

19-B-

1.0V

Theft protection



20

VT/WH

Central locking motors rear doors, operating current for theft security locking

Out

Not operated

B+ -20

B+

Doors and locks









Lock the car.

Then activate function with diagnostic tool.

20-B-

B+













B+ -20

<1V





21

BN/OG

Seat sensor passenger seat, ground.



Out

Ignition ON

B+ -21

B+

Seat belt system



22

OG

Central locking motors doors, operating current for locking

Out

Not operated

B+ -22

B+

Doors and locks









Car must be unlocked.

Then activate function with diagnostic tool.

22-B-

B+









B+ -22

<1V





23

BU/WH

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

YE/GN

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

Out

Brake pedal pressed.

24-B-

B+

Lighting and signalling systems



25

BU/OG

Left brake light, power supply from TWICE to bulb.

Out

Brake pedal pressed.

25-B-

B+

Lighting and signalling systems



26

BU/YE

Central locking motor driver's door, operating current for unlock

Out

Not operated

B+ -26

B+

Doors and locks















Car must be unlocked.

Then activate function with diagnostic tool.

26-B-

B+















B+ -26

<1V





27

GY/WH

LED, theft security.

Out

Activate function with diagnostic tool

B+ -27

approx. 1.95 V

Theft protection



28

RD/WH

Seat belt warning lamp, ground.





Out

Ignition ON

28-B-

<1 V for 6 sec

Seat belt system













Seat belt buckled more than 6 seconds since ignition ON.

28-B-

B+



29

YE

Siren, communication



Out

Ignition ON

29-B-

B+

Theft protection



30



No connection













31



No connection













32

RD/VT

Locking with key in passenger door.

In

Ignition ON

B+ -32

B+ for approx. 0.5 sec.

Doors and locks



33

BU/BN

Unlock with key in driver's door.



In

Ignition ON

B+ -33

B+ for 0.5 sec.

Doors and locks



34

BK

Tilt sensor, ground

In

Always

B+ -34

B+



Theft protection













34-B-

<0.5V





35

BK

Luggage compartment switch

In

Ignition ON:



Tailgate closed.



35-B-

B+ for approx. 0.5 sec.





Lighting and signalling systems



Theft protection











Tailgate open.

35-B-

<0.1V





36

BK/GN

Door switch; right rear door.

In

Ignition ON:



Door closed.

36-B-



B+ for approx. 0.5 sec.



Lighting and signalling systems



Theft protection







Door open.

36-B-

<0.1V





37

BK

Signal ground



In

Always

B+ -37

B+













37-B-

<0.5V





38

GN

I-bus (+)



In/Out

Ignition ON:



Bus active

38-B-

2-3V



39

OG/BK

Immobilizer; code from antenna unit by the ignition lock.

In

Ignition ON



39-B-

B+

Theft protection









Ignition OFF.

B+ -39

<0.1V





40



No connection













41

RD/WH

Bonnet switch

In

Ignition ON:



Bonnet closed.

41-B-

B+ for approx. 0.5 sec.

Theft protection











Bonnet open.

41-B-

<0.1V





42

VT

Central locking motor driver's side, operating current for theft prevention locking.



Car must be locked.

Out

Not operated

B+ -42

B+

Doors and locks









Activate function with diagnostic tool

42-B-

B+









B+ -42

<1V



43

RD

TWICE, power supply +30.

In

Always +30

43-B-

B+













B+ -43

<0.5V





44

VT/WH

Central locking system motor luggage compartment, operating current for theft security locking.



Car must be locked.

Out

Not operated







B+ -44





B+

Doors and locks









Activate function with diagnostic tool

44-B-

B+









B+ -44

<1V



45

GN/YE

Parking light left 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

GN/WH

Parking light right 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 system, power supply from fuse.

In

Always +30.



47-B-

B+





Doors and locks













Activate any central locking function.

B+ -47

<1V





48

VT

Brake light, power supply from brake light switch.

In

Brake pedal pressed.

48-B-

B+

Lighting and signalling systems



49

BU/YE

Central locking motors rear doors, operating current for unlocking.

Out

Not operated

B+ -49

B+

Doors and locks









Activate function with diagnostic tool

49-ground

B+







B+ -49

<1V



50

BK

Antenna unit for immobilizer; power supply.

Out

Ignition ON:

Without transponder

50-B-





B+ for approx. 10 sec.

Theft protection











Ignition ON:

With transponder

50-B-

B+ for approx. 0.1 sec.





51

YE



Luggage compartment opening, relay.

Out

Not operated

51-B-

B+

Doors and locks













Activate function with diagnostic tool.

B+ -51

< 0.5V



52

BU/RD

Heated rear seat, relay.



Out

Activate with diagnostic tool.



52-B-





approx. 1V



Seats











Not operated

52-B-

B+





53



No connection













54



No connection













55

BU/WH

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

RD/VT

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

WH/BK

Glass breakage sensor, ground

In

Always

B+ -57

B+





Theft protection











57-B-

<0.5V





58

GN/GY

Glass breakage sensor, signal



In

Ignition ON

58-B-

B+ for approx. 0.5 sec.

Theft protection



59

BU/WH

Tailgate switch for disarming anti-theft alarm.

In

Ignition ON:



Not operated

59-B-

B+ for approx. 0.5 sec.

Doors and locks



Theft protection









Turn the key to the unlocked position.



59-B-

<0.1V



60

BK/GN



Door switch passenger door, front

In

Ignition ON:



Door closed.

60-B-

B+ for approx. 0.5 sec.

Lighting and signalling systems



Theft protection













Door open



60-B-

<0.1V



61

GY/GN



Door switch, driver's door.

In

Ignition ON:



Door closed.





61-B-



B+ for approx. 0.5 sec.

Lighting and signalling systems



Theft protection











Door open



61-B-

<0.1V



62

BK

Central locking system motor, luggage compartment, ground



Out

Not operated

B+ -62

B+

Doors and locks



63



No connection













64



No connection













65

LHD:

RD/BK

RHD:

BU/RD

CONV:

GY/WH



Seat belt switch, passenger side

In

Ignition ON:



Seat belt on passenger side not buckled.

65-B-







<0.5V





Seat belt system







Belt buckled



65-B-

B+



66

VT

Central locking motor passenger side front, operating current for theft prevention locking

Out

Not operated

B+ -66

B+



Doors and locks









Lock the car.

Activate function with diagnostic tool

66-B-





B+













B+ -66

<1V





67

BU/YE

Central locking system motor, luggage compartment, operating current

Out

Not operated

B+ -67

B+



Doors and locks









Activate function with diagnostic tool

67-B-





B+

















B+ -67

<1V





68

BN/GN

Parking light right 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

BU/YE

Central locking motor passenger door front, operating current for unlocking

Out

Not operated



B+ -69

B+

Doors and locks









Activate function with diagnostic tool



69-B-

B+











B+ -69

<1V





70

BK

Power ground TWICE



In

Always

B+ -70

B+













Operate central locking function



70-B-

<0.3V