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.
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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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| 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/Output
|
Test conditions
|
Across
|
Test reading
|
See
|
|
1
|
Brake light right-hand, power supply from TWICE to lamp bulb.
|
Out
|
Brake pedal pressed.
|
1-B-
|
B+
|
Lighting and signalling systems
|
|
2
|
Tailgate, relay. 5D, ground
|
Out
|
Lock tailgate
|
B+-2
|
B+
|
Doors and locks
|
|
3
|
Electrically adjustable passenger seat, ground relay.
|
Out
|
Ignition ON
|
3-B-
|
approx. 1V
|
Seats
|
|
|
|
|
Ignition OFF. Front doors closed.
Not operated. |
3-B-
|
B+
|
|
|
4
|
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
|
Seat sensor, passenger seat.
|
In
|
Passenger seat occupied.
|
5-21
|
<4.2V
|
Seat belt system
|
|
|
|
|
Passenger seat unoccupied.
|
5-21
|
5V
|
|
|
6
|
Locking switch for central locking, centre console.
|
In
|
Ignition ON
|
6-B-
|
B+ for approx. 0.5 sec.
|
Doors and locks
|
|
7
|
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
|
Heated rear seat, request.
|
In
|
Ignition ON:
Button for rear seat heater held down. |
9-B-
|
B+
|
Seats
|
|
10
|
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)
Tilt sensor
|
|
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.
|
|
|
13
|
Receiver remote control, ground.
|
In
|
Always
|
B+ -13
13-B- |
B+
<0.5V |
|
|
14
|
Receiver, remote control, anti-theft alarm, signal.
|
In
|
Remote control not operated.
|
14-B-
|
B+
|
|
|
|
|
Press lock button.
|
14-B-
|
approx. 6V for approx. 0.2 sec.
|
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|
15
|
I-bus (-)
|
In/Out
|
Ignition ON:
Bus active |
15-B-
|
2-3V
|
|
|
16
|
Ignition +15, logic.
|
In
|
Ignition ON
|
16-B-
|
B+
|
TWICE
|
|
17
|
Ignition +B, logic
|
In
|
Ignition ON:
Key in ignition lock |
17-B-
|
B+
|
TWICE
|
|
18
|
Not used
|
|
|
|
|
|
|
19
|
Tilt sensor signal.
|
In
|
Ignition ON
|
19-B-
|
1.0V
|
|
|
20
|
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
|
Seat sensor passenger seat, ground.
|
Out
|
Ignition ON
|
B+ -21
|
B+
|
Seat belt system
|
|
22
|
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
|
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
|
High level brake light, power supply from TWICE to bulb.
|
Out
|
Brake pedal pressed.
|
24-B-
|
B+
|
Lighting and signalling systems
|
|
25
|
Brake light left-hand, power supply from TWICE to bulb.
|
Out
|
Brake pedal pressed.
|
25-B-
|
B+
|
Lighting and signalling systems
|
|
26
|
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
|
LED, theft protection.
|
Out
|
Activate function with diagnostic tool
|
B+ -27
|
approx. 1.95V
|
|
|
28
|
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
|
Siren, communication
|
Out
|
Ignition ON
|
29-B-
|
B+
|
|
|
30
|
No connection
|
|
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31
|
No connection
|
|
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32
|
No connection
|
|
|
|
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|
|
33
|
Unlock with key in driver's door.
|
In
|
Ignition ON
|
B+ -33
|
approx. 8V for 0.5 sec
|
Doors and locks
|
|
34
|
Tilt sensor, ground
|
In
|
Always
|
B+ -34
34-B- |
B+
<0.5V |
|
|
35
|
Boot lid/tailgate switch.
|
In
|
Ignition ON:
Tailgate closed. |
35-B-
|
B+ for approx. 0.5 sec.
|
|
|
|
|
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.
|
|
|
|
|
|
Door open.
|
36-B-
|
<0.1V
|
|
|
37
|
Signal ground
|
In
|
Always.
|
B+ -37
37-B- |
B+
<0.5V |
TWICE
|
|
38
|
I-bus (+)
|
In/Out
|
Ignition ON:
Bus active |
38-B-
|
2-3V
|
|
|
39
|
Immobiliser; code from antenna unit via ignition lock.
|
In
|
Ignition ON
|
39-B-
|
B+
|
|
|
|
|
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.
|
|
|
|
|
Bonnet open.
|
41-B-
|
<0.1V
|
|
|
|
42
|
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
|
TWICE, power supply +30 circuit.
|
In
|
Always +30
|
43-B-
B+ -43 |
B+
<0.5V |
TWICE
|
|
44
|
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
|
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
|
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
|
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 contact.
|
In
|
Brake pedal pressed.
|
48-B-
|
B+
|
Lighting and signalling systems
|
|
49
|
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
|
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
|
Tailgate. 5D Locking
|
|
Always
|
51-B-
B+-51 |
B+
<1V |
Doors and locks
|
|
52
|
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
|
|
|
|
|
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|
55
|
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
|
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
|
Glass break sensor, ground
|
In
|
Always
|
B+ -57
57-B- |
B+
<0.5V |
4D LINK, 5D
|
|
58
|
Glass break sensor, signal
|
In
|
Ignition ON
|
58-B-
|
B+ for approx. 0.5 sec.
|
4D
5D
|
|
59
|
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
|
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
|
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
|
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
|
|
|
|
Belt fastened
|
64-B-
|
B+
|
|
|
|
65
|
No connection
|
|
|
|
|
|
|
66
|
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
|
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
|
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
|
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
|
Power ground TWICE
|
In
|
Always.
Operate central locking function |
B+ -70
70-B- |
B+
<0.3V |
TWICE
|
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