Test readings, control module connections
| Test readings, 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.
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| • |
The nominal test readings shown apply with the ignition switched ON unless otherwise stated.
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| • |
First, check that the power supply to the module is correct and that it is grounded properly.
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| • |
Then check all the sensor inputs and signals from other systems.
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| • |
Finally, check the outputs. Remember that the test readings do not tell us whether or not the module is functioning properly.
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| • |
If a test reading is incorrect, investigate which leads, connectors or components should then be checked, using the wiring diagram.
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| • |
The nominal test readings shown below apply when using a calibrated Fluke 88/97.
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| • |
Test readings % (+) 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+.
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| Control module connection |
> = 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/out
|
Test conditions
|
Measure across
|
Test reading
|
See
|
|
1
|
RD/YE
|
Brake light RH, voltage measurement from TWICE to lamp bulb.
|
Out
|
Brake pedal depressed.
|
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
|
Electric powered passenger seat, relay ground.
|
Out
|
Ignition ON
|
3-B-
|
approx. 1 V
|
Seats
|
|
|
|
|
|
Ignition OFF. Front doors closed.
Not affected. |
3-B-
|
B+
|
|
|
4
|
BU/WH
|
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
|
GN/WH
|
Seat sensor, passenger seat.
|
In
|
Passenger seat occupied.
|
5-21
|
<4.2V
|
Seat belt system
|
|
|
|
|
Passenger seat not occupied.
|
5-21
|
5V
|
|
|
|
6
|
RD/BU
|
Switch, locking central locking, centre console.
|
In
|
Ignition ON.
|
6-B-
|
B+ for approx. 0.5 sec.
|
Doors and locks
|
|
7
|
BN/RD
|
Switch, unlocking central locking, centre console.
|
In
|
Ignition ON.
|
7-B-
|
B+ for approx. 0.5 sec.
|
Doors and locks
|
|
8
|
|
No connection.
|
|
|
|
|
|
|
9
|
BK/GN
|
Heater pad rear seat, request.
|
In
|
Ignition ON:
Pushbutton rear seat heater pad kept depressed. |
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+
|
Theft protection
4D
5D
|
|
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, LH rear door.
|
In
|
Ignition ON:
Door closed |
12-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
|
|
13
|
VT/WH
|
Remote control receiver, ground.
|
In
|
Always
|
B+ -13
13-B- |
B+
<0.5V |
Theft protection
|
|
14
|
BN/YE
|
Remote control receiver, 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
|
WH
|
I-bus (-)
|
In/Out
|
Ignition ON:
Bus active |
15-B-
|
2-3V
|
|
|
16
|
RD/BU
|
Ignition +15, logic.
|
In
|
Ignition ON.
|
16-B-
|
B+
|
|
|
17
|
OG
|
Ignition +B, logic.
|
In
|
Ignition ON:
Key in ignition switch |
17-B-
|
B+
|
|
|
18
|
LHD: RD/BU
RHD: BN/WH |
Seat belt switch, driver's side.
|
In
|
Ignition ON:
Seat belt on driver's side not connected in buckle |
18-B-
|
<0.5V
|
Seat belt system
|
|
Belt connected
|
18-B-
|
B+
|
|
||||
|
19
|
GN
|
Tilt sensor signal.
|
In
|
Ignition ON
|
19-B-
|
1.0V
|
Theft protection
|
|
20
|
RD/WH
|
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 diagnostics 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
|
GN/BU
|
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 diagnostics tool. |
22-B-
B+ -22 |
B+
<1V |
|
||||
|
23
|
GN
|
Parking light LH rear, power supply from switch.
|
In
|
Light switch in parking light position (pos 1)
|
23-B-
|
B+
|
Lighting and signalling systems
|
|
24
|
BN
|
High-level brake light, power supply from TWICE to lamp bulb.
|
Out
|
Brake pedal depressed.
|
24-B-
|
B+
|
Lighting and signalling systems
|
|
25
|
RD/GY
|
Brake light LH, power supply from TWICE to lamp bulb.
|
Out
|
Brake pedal depressed.
|
25-B-
|
B+
|
Lighting and signalling systems
|
|
26
|
BK/GN
|
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 diagnostics tool. |
26-B-
B+ -26 |
B+
<1V |
|
|||
|
27
|
YE/GN
|
LED, anti-theft protection
|
Out
|
Activate function with diagnostics tool.
|
B+ -27
|
approx. 1.95 V
|
Theft protection
|
|
28
|
BK/VT
|
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
|
YE/GN
|
Siren, communication
|
Out
|
Ignition ON.
|
29-B-
|
B+
|
Theft protection
|
|
30
|
|
No connection.
|
|
|
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31
|
|
No connection.
|
|
|
|
|
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32
|
|
No connection.
|
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|
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|
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|
33
|
YE/BU
|
Unlocking 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 |
Theft protection
|
|
35
|
GN/GY
|
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
|
GN
|
Door switch; RH rear door.
|
In
|
Ignition ON:
Door closed. |
36-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
|
|
|
|
|
|
Door open.
|
36-B-
|
<0.1V
|
|
|
37
|
BK
|
Signal ground.
|
In
|
Always.
|
B+ -37
37-B- |
B+
<0.5V |
|
|
38
|
GN
|
I-bus (+)
|
In/Out
|
Ignition ON:
Bus active. |
38-B-
|
2-3V
|
|
|
39
|
BN/YE
|
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
|
BU
|
Bonnet switch.
|
In
|
Ignition ON:
Bonnet closed. |
41-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
|
|
|
|
|
Bonnet open.
|
41-B-
|
<0.1V
|
|
|
|
42
|
BN/GN
|
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 diagnostics tool.
|
42-B-
B+ -42 |
B+
<1V |
|
|||
|
43
|
RD
|
TWICE, power supply +30.
|
In
|
Always +30
|
43-B-
B+ -43 |
B+
<0.5V |
|
|
44
|
GY
|
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
|
GN
|
Parking light LH 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
|
BU
|
Parking light RH rear, power supply from switch.
|
In
|
Light switch in parking light position (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 switch.
|
In
|
Brake pedal depressed.
|
48-B-
|
B+
|
Lighting and signalling systems
|
|
49
|
YE/GN
|
Central locking motors rear doors, control voltage unlocking.
|
Out
|
Not affected
|
B+ -49
|
B+
|
Doors and locks
|
|
|
|
|
Activate function with diagnostics tool.
|
49-ground
B+ -49 |
B+
<1V |
|
|
|
50
|
GN
|
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
|
WH
|
Tailgate. 5D Locking
|
|
Always
|
51-B-
B+-51 |
B+
<1V |
Doors and locks
|
|
52
|
GN
|
Electric heater rear seat, relay.
|
Out
|
Activate with diagnostics tool.
|
52-B-
|
approx. 1 V
|
Seats
|
|
|
|
|
Not affected
|
52-B-
|
B+
|
|
|
|
53
|
|
No connection.
|
|
|
|
|
|
|
54
|
|
No connection.
|
|
|
|
|
|
|
55
|
RD/BU
|
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
|
BK/WH
|
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
|
RD/BU
|
Glass breakage sensor, ground.
|
In
|
Always
|
B+ -57
57-B- |
B+
<0.5V |
Theft protection
4D
5D
|
|
58
|
YE/BU
|
Glass breakage sensor, signal.
|
In
|
Ignition ON.
|
58-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
4D
5D
|
|
59
|
BU
|
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
|
GN/BU
|
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
|
RD/BU
|
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
|
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 in buckle |
65-B-
|
<0.5V
|
Seat belt system
|
|
|
|
Seat belt buckled
|
65-B-
|
B+
|
|
||
|
66
|
BK/GN
|
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 diagnostics tool. |
66-B-
B+ -66 |
B+
<1V |
|
|
|
67
|
GN/WH
|
Central locking system motor boot lid/tailgate, control voltage
|
Out
|
Not affected
|
B+ -67
|
B+
|
Doors and locks
|
|
|
|
|
Activate function with diagnostics tool.
|
67-B-
B+ -67 |
B+
<1V |
|
|
|
68
|
BU
|
Parking light RH 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
|
VT/WH
|
Central locking motor passenger door front, control voltage unlocking.
|
Out
|
Not affected
|
B+ -69
|
B+
|
Doors and locks
|
|
|
|
|
Activate function with diagnostics 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 |
|
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