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.
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Note the measuring conditions and use common sense when assessing the results.
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The nominal values shown apply with the ignition switched ON unless otherwise stated.
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First, check that the power supplies to the module are 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 measured values 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 nominal values shown below apply when using a calibrated Fluke 88/97.
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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+.
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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.
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Lead colour
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Component/
Function |
In/output
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Measuring conditions
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Measure across
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Nominal value
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See
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1
|
YE/RD
|
Brake light right-hand, voltage measurement from TWICE to lamp bulb.
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Out
|
Brake pedal depressed.
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1-B-
|
B+
|
Lighting and signalling system
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2
|
No connection.
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||
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3
|
GN/WH
|
Electric powered passenger seat, relay ground.
|
Out
|
Ignition ON
|
3-B-
|
approx. 1 V
|
Seats
|
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Ignition OFF. Front doors closed.
Not affected. |
3-B-
|
B+
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4
|
BU/WH
|
Starter relay, ground
|
Out
|
Ignition switch in ST position.
Transponder not OK. |
4-B-
|
B+
|
Theft protection
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Ignition switch in ST position.
Transponder OK. |
4-B-
|
<0.5V
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5
|
LHD: GN/WH
RHD: GN/WH |
Seat sensor, passenger seat.
|
In
|
Passenger seat occupied.
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5-21
|
<4.2V
|
Seat belt system
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Passenger seat not occupied.
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5-21
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5V
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6
|
BU/RD
|
Switch, locking central locking, centre console.
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In
|
Ignition ON.
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6-B-
|
B+ for approx. 0.5 sec.
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Doors and locks
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7
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BN/RD
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Switch, unlocking central locking, centre console.
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In
|
Ignition ON.
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7-B-
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B+ for approx. 0.5 sec.
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Doors and locks
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8
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No connection.
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9
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GN/BK
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Heater pad rear seat, request.
|
In
|
Ignition ON:
Pushbutton rear seat heater pad kept depressed. |
9-B-
|
B+
|
Seats
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10
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RD/WH
|
Glass breakage sensor and tilt sensor, power supply.
|
Out
|
Sensor not disconnected.
Anti-theft alarm armed. |
10-B-
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B+
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Theft protection
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11
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YE
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Switch unlocking of boot lid.
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In
|
Ignition ON.
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11-B-
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B+ for approx. 0.5 sec.
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Doors and locks
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12
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YE/WH
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Door switch, left-hand rear door.
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In
|
Ignition ON:
Door closed |
12-B-
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B+ for approx. 0.5 sec.
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Theft protection
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13
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VT/WH
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Remote control receiver, ground.
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In
|
Always
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B+ -13
13-B- |
B+
<0.5V |
Theft protection
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14
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YE/BN
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Remote control receiver, anti-theft alarm, signal.
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In
|
Remote control not affected.
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14-B-
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B+
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Theft protection
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Press in locking button.
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14-B-
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approx. 6V for approx. 0.2 sec.
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15
|
WH
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I-bus (-)
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In/Out
|
Ignition ON:
Bus active |
15-B-
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2-3V
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16
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BU/RD
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Ignition +15, logic.
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In
|
Ignition ON.
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16-B-
|
B+
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17
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OG
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Ignition +B, logic.
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In
|
Ignition ON:
Key in ignition switch |
17-B-
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B+
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18
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LHD: BU/RD
RHD: BN/WH |
Seat belt switch, driver's side.
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In
|
Ignition ON:
Seat belt on driver's side not connected in buckle |
18-B-
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<0.5V
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Seat belt system
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Belt connected
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18-B-
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B+
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||||
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19
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GN
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Tilt sensor signal.
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In
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Ignition ON
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19-B-
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1.0V
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Theft protection
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20
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RD/WH
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Central locking motors rear doors, control voltage anti-theft protection locking
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Out
|
Not affected
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B+ -20
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B+
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Doors and locks
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Lock the car.
Then activate the function with the diagnostics tool. |
20-B-
B+ -20 |
B+
<1V |
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21
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GN/WH
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Seat sensor passenger seat, ground.
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Out
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Ignition ON.
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B+ -21
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B+
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Seat belt system
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22
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BU/GN
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Central locking motors doors, control voltage locking
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Out
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Not affected
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B+ -22
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B+
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Doors and locks
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The car must not be locked.
Then activate the function with the diagnostics tool. |
22-B-
B+ -22 |
B+
<1V |
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23
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GN
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Parking light left-hand rear, power supply from switch.
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In
|
Light switch in parking light position (pos 1)
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23-B-
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B+
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Lighting and signalling system
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24
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RD/BK
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High-level brake light, power supply from TWICE to lamp bulb.
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Out
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Brake pedal depressed.
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24-B-
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B+
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Lighting and signalling system
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25
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GY/RD
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Brake light left-hand, power supply from TWICE to lamp bulb.
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Out
|
Brake pedal depressed.
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25-B-
|
B+
|
Lighting and signalling system
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26
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BK/GN
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Central locking motor driver's door, control voltage unlocking
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Out
|
Not affected
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B+ -26
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B+
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Doors and locks
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The car must not be locked.
Then activate the function with the diagnostics tool. |
26-B-
B+ -26 |
B+
<1V |
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27
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GN/YE
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LED, anti-theft protection
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Out
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Activate function with diagnostics tool.
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B+ -27
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approx. 1.95 V
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Theft protection
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28
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BK/VT
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Seat belt warning lamp, ground.
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Out
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Ignition ON
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28-B-
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<1V for 6 secs.
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Seat belt system
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Seat belt buckled, more than 6 secs. since ignition was switched ON.
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28-B-
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B+
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29
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GN/YE
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Siren, communication
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Out
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Ignition ON.
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29-B-
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B+
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Theft protection
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30
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No connection.
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31
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No connection.
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32
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No connection.
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33
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BU/YE
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Unlocking with key in driver's door.
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In
|
Ignition ON.
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B+ -33
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approx. 8V for 0.5 sec
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Doors and locks
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34
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BN/WH
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Tilt sensor, ground.
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In
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Always
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B+ -34
34-B- |
B+
<0.5V |
Theft protection
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35
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GN/GY
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Luggage compartment switch.
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In
|
Ignition ON:
Tailgate closed. |
35-B-
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B+ for approx. 0.5 sec.
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Theft protection
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Tailgate open.
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35-B-
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<0.1V
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36
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GN
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Door switch; right-hand rear door.
|
In
|
Ignition ON:
Door closed. |
36-B-
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B+ for approx. 0.5 sec.
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Theft protection
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Door open.
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36-B-
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<0.1V
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37
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BK
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Signal ground.
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In
|
Always.
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B+ -37
37-B- |
B+
<0.5V |
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38
|
GN
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I-bus (+)
|
In/Out
|
Ignition ON:
Bus active. |
38-B-
|
2-3V
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39
|
YE/BN
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Immobilization; code from antenna unit near ignition switch.
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In
|
Ignition ON.
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39-B-
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B+
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Theft protection
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Ignition OFF.
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B+ -39
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<0.1V
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40
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No connection.
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41
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BU
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Bonnet switch.
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In
|
Ignition ON:
Bonnet closed. |
41-B-
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B+ for approx. 0.5 sec.
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Theft protection
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Bonnet open.
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41-B-
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<0.1V
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42
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BN/GN
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Central locking motor driver's door, control voltage, anti-theft locking.
The car must be locked. |
Out
|
Not affected
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B+ -42
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B+
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Doors and locks
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Activate function with diagnostics tool.
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42-B-
B+ -42 |
B+
<1V |
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43
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RD
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TWICE, power supply +30.
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In
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Always +30
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43-B-
B+ -43 |
B+
<0.5V |
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44
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No connection.
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45
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GN
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Parking light left-hand rear, power supply from TWICE to lamp bulb.
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Out
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Light switch in parking light position (pos 1)
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45-B-
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B+
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Lighting and signalling system
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46
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BU
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Parking light right-hand rear, power supply from switch.
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In
|
Light switch in parking light position (pos 1)
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46-B-
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B+
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Lighting and signalling system
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47
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RD
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Central locking, power supply from fuse.
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In
|
Always +30.
Activate any central locking function. |
47-B-
B+ -47 |
B+
<1V |
Doors and locks
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48
|
GN/GY
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Brake light, power supply from brake light switch.
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In
|
Brake pedal depressed.
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48-B-
|
B+
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Lighting and signalling system
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49
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GN/YE
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Central locking motors rear doors, control voltage unlocking.
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Out
|
Not affected
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B+ -49
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B+
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Doors and locks
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Activate function with diagnostics tool.
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49-ground
B+ -49 |
B+
<1V |
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50
|
GN
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Antenna unit immobilization; power supply.
|
Out
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Ignition ON:
Without transponder |
50-B-
|
B+ for approx. 10 secs.
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Theft protection
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Ignition ON:
With transponder |
50-B-
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B+ for approx. 0.1 secs.
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51
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No connection.
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52
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GN
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Electric heater rear seat, relay.
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Out
|
Activate with diagnostics tool.
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52-B-
|
approx. 1 V
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Seats
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Not affected
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52-B-
|
B+
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53
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No connection.
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54
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No connection.
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55
|
BU/RD
|
Lock button, driver's door.
|
In
|
Ignition ON:
Lock button up. |
55-B- |
0V |
Doors and locks
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Lock button down.
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55-B-
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B+ for approx. 0.5 sec.
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56
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BK/WH
|
Locking with key in driver's door.
|
In
|
Ignition ON.
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56-B-
|
8V for approx. 0.5 secs.
|
Doors and locks
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Key in door lock in locked position.
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56-B-
|
0V
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57
|
BU/RD
|
Glass breakage sensor, ground.
|
In
|
Always
|
B+ -57
57-B- |
B+
<0.5V |
Theft protection
|
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58
|
BU/YE
|
Glass breakage sensor, signal.
|
In
|
Ignition ON.
|
58-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
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59
|
BU
|
Tailgate switch for disarming anti-theft alarm.
|
In
|
Ignition ON:
Not affected |
59-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
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Turn key to unlocked position.
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59-B-
|
<0.1V
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60
|
GN/BU
|
Door switch passenger door, front
|
In
|
Ignition ON:
Door closed. |
60-B-
|
B+ for approx. 0.5 sec.
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Theft protection
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Door open.
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60-B-
|
<0.1V
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61
|
BU/RD
|
Door switch, driver's door
|
In
|
Ignition ON:
Door closed. |
61-B-
|
B+ for approx. 0.5 sec.
|
Theft protection
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Door open.
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61-B-
|
<0.1V
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62
|
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63
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No connection.
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64
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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 in buckle |
65-B-
|
<0.5V
|
Seat belt system
|
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Seat belt buckled
|
65-B-
|
B+
|
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||
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66
|
GN/BK
|
Central locking motor passenger door front, control voltage, anti-theft locking.
|
Out
|
Not affected
|
B+ -66
|
B+
|
Doors and locks
|
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Lock the car
Activate function with diagnostics tool. |
66-B-
B+ -66 |
B+
<1V |
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67
|
GN/WH
|
Central locking motor tailgate, control voltage.
|
Out
|
Not affected
|
B+ -67
|
B+
|
Doors and locks
|
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Activate function with diagnostics tool.
|
67-B-
B+ -67 |
B+
<1V |
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68
|
BU
|
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 system
|
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69
|
VT/WH
|
Central locking motor passenger door front, control voltage unlocking.
|
Out
|
Not affected
|
B+ -69
|
B+
|
Doors and locks
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Activate function with diagnostics tool.
|
69-B-
B+ -69 |
B+
<1V |
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70
|
BK
|
Power ground TWICE
|
In
|
Always.
Operate central locking function. |
B+ -70
70-B- |
B+
<0.3V |
|
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