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 |
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Note the test conditions and use common sense when assessing the test result.
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The nominal values specified apply with the ignition in the ON position unless otherwise stated.
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First check that the control module has a power supply and is grounded.
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Then check all sensor inputs and signals from other systems.
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finally, check the outputs. Remember that the test results do not tell us whether or not the module is functioning properly.
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If any reading is not OK, consult the wiring diagram to trace the leads, connectors or components which should be checked more thoroughly.
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The specified test readings refer to those obtained with a calibrated Fluke 88/97.
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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+.
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> = greater than; < = less than; » = approx. equal to; ~ = AC voltage (LP: LOGIC PROBE P = select pulse; p = visible pulses); LH = left-hand; RH = right-hand
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Pin No.
|
Lead 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 system
|
|
2
|
|
No connection
|
|
|
|
|
|
|
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+
|
|
|
|
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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
|
|
|
|
|
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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+
|
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|
11
|
YE
|
Switch unlocking of boot lid.
|
In
|
Ignition ON
|
11-B-
|
B+ for approx. 0.5 sec.
|
Doors and locks
|
|
12
|
YE/WH
|
Door switch, left-hand rear door.
|
In
|
Ignition ON:
Door closed. |
12-B-
|
B+ for approx. 0.5 sec.
|
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|
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+
|
|
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Press lock button.
|
14-B-
|
approx. 6V for approx. 0.2 sec.
|
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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
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Seat belt fastened
|
18-B-
|
B+
|
|
||||
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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
|
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Lock the car.
Activate function with diagnostic tool. |
20-B-
B+ -20 |
B+
<1V |
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||||
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21
|
GN/WH
|
Seat sensor passenger seat, ground.
|
Out
|
Ignition ON
|
B+ -21
|
B+
|
Seat belt system
|
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22
|
BU/GN
|
Central locking motors doors, control voltage for locking
|
Out
|
Not operated
|
B+ -22
|
B+
|
Doors and locks
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|
Car to be unlocked.
Activate function with diagnostic tool. |
22-B-
B+ -22 |
B+
<1V |
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||||
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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 system
|
|
24
|
RD/BK
|
High level brake light, power supply from TWICE to bulb.
|
Out
|
Brake pedal pressed.
|
24-B-
|
B+
|
Lighting and signalling system
|
|
25
|
GY/RD
|
Brake light left-hand, power supply from TWICE to bulb.
|
Out
|
Brake pedal pressed.
|
25-B-
|
B+
|
Lighting and signalling system
|
|
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 |
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27
|
GN/YE
|
LED, theft protection.
|
Out
|
Activate function with diagnostic tool
|
B+ -27
|
approx. 1.95 V
|
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|
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 secs. since ignition was switched ON.
|
28-B-
|
B+
|
|
||
|
29
|
GN/YE
|
Siren, communication
|
Out
|
Ignition ON
|
29-B-
|
B+
|
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|
30
|
|
No connection
|
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31
|
|
No connection
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32
|
|
No connection
|
|
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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
|
Luggage compartment switch
|
In
|
Ignition ON:
Tailgate closed. |
35-B-
|
B+ for approx. 0.5 sec.
|
|
|
|
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|
Tailgate open.
|
35-B-
|
<0.1V
|
|
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|
36
|
GN
|
Door switch; right-hand rear door.
|
In
|
Ignition ON:
Door closed. |
36-B-
|
B+ for approx. 0.5 sec.
|
|
|
|
|
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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
|
Immobilizer; code from antenna unit via ignition lock.
|
In
|
Ignition ON
|
39-B-
|
B+
|
|
|
|
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Ignition OFF.
|
B+ -39
|
<0.1V
|
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40
|
|
No connection
|
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41
|
BU
|
Bonnet switch
|
In
|
Ignition ON:
Bonnet closed. |
41-B-
|
B+ for approx. 0.5 sec.
|
|
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Bonnet open.
|
41-B-
|
<0.1V
|
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|
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
|
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Activate function with diagnostic tool
|
42-B-
B+ -42 |
B+
<1V |
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|||
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43
|
RD
|
TWICE, power supply +30 circuit.
|
In
|
Always +30
|
43-B-
B+ -43 |
B+
<0.5V |
TWICE
|
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44
|
|
No connection
|
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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 system
|
|
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 system
|
|
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 system
|
|
49
|
GN/YE
|
Central locking motors rear doors, control voltage for unlocking.
|
Out
|
Not operated
|
B+ -49
|
B+
|
Doors and locks
|
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|
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Activate function with diagnostic tool
|
49-ground
B+ -49 |
B+
<1V |
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50
|
GN
|
Antenna unit for immobilizer; power supply.
|
Out
|
Ignition ON:
Without transponder |
50-B-
|
B+ for approx. 10 sec.
|
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Ignition ON:
With transponder |
50-B-
|
B+ for approx. 0.1 sec.
|
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51
|
|
No connection
|
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52
|
GN
|
Heated rear seat, relay.
|
Out
|
Activate with diagnostic tool.
|
52-B-
|
approx. 1 V
|
Seats
|
|
|
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|
Not operated
|
52-B-
|
B+
|
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53
|
|
No connection
|
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54
|
|
No connection
|
|
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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 |
|
|
58
|
BU/YE
|
Glass break sensor, signal
|
In
|
Ignition ON
|
58-B-
|
B+ for approx. 0.5 sec.
|
|
|
59
|
BU
|
Tailgate switch for disarming anti-theft alarm.
|
In
|
Ignition ON:
Not operated |
59-B-
|
B+ for approx. 0.5 sec.
|
|
|
|
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|
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.
|
|
|
|
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|
Door open
|
61-B-
|
<0.1V
|
|
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62
|
|
No connection
|
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63
|
|
No connection
|
|
|
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|
|
|
64
|
|
No connection
|
|
|
|
|
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|
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 motor tailgate, control voltage
|
Out
|
Not operated
|
B+ -67
|
B+
|
Doors and locks
|
|
|
|
|
Activate function with diagnostic tool
|
67-B-
B+ -67 |
B+
<1V |
|
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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 system
|
|
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
|
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