Checking the connectors and bus cable
Remember that the CAN network is only a communication network. There are no fuses, contact breakers or sensors on the CAN bus. Check resistance as below (see instruction).
To obtain the correct value the battery must be disconnected during resistance measurement.
Check the bus cable. Check for a short-circuit to ground according to Short-circuit to ground, intermittent faults .
Check the intermediate connectors. Check for contact resistance and oxidation according to Contact resistance and oxidation . Check for loose connections according to Loose connections (terminals) .
HINT: If the fault is detected before all the cables have been examined, the cables need not be checked.
The following cables and connectors should be examined to localize a short-circuit.
The cable between:
- Road Traffic Information (RTI) terminal #22A and rear electronic module terminal #17A.
Road Traffic Information (RTI) terminal #10A and rear electronic module terminal #15A.
To connect the breakout box to the RTI control module, see Connecting the breakout box to the Road Traffic Information (RTI) control module
To connect the breakout box to the rear electronic module, see Connecting the breakout box
- rear electronic module #16A and Driver Information Module #9 and intermediate connector 54/40.
rear electronic module #14A and Driver Information Module #8 and intermediate connector 54/40.
To connect the breakout box to the rear electronic module, see Connecting the breakout box
To connect the breakout box to the driver information module, see Connecting the Driver Information Module (DIM) test box
- central electronic module #2D and Driver Information Module #9.
Central electronic module (CEM) #3D and Driver Information Module (DIM) #8.
To connect the breakout box to the central electronic module (CEM), see Connecting the breakout box
To connect the breakout box to the driver information module, see Connecting the Driver Information Module (DIM) test box
- power seat module terminal #3B and driver information module terminal #9.
power seat module terminal #2B and driver information module terminal #8.
To connect the breakout box to the power seat module, see Connecting the breakout box, power seat module (PSM)
To connect the breakout box to the driver information module, see Connecting the Driver Information Module (DIM) test box
- Driver Information Module #3 and Climate control module #12A.
Driver Information Module (DIM) #2 and Climate control module (CCM) #14A.
To connect the breakout box to the driver information module, see Connecting the Driver Information Module (DIM) test box
To connect the breakout box to the climate control module, see Connecting the breakout box
- audio module #8A and Climate control module #12A.
audio module #7A and Climate control module #14A.
To connect the breakout box to the audio control module, see Connecting the breakout box, Audio control module
To connect the breakout box to the climate control module, see Connecting the breakout box
- carphone module #10A and Climate control module #12A.
carphone module #22A and Climate control module #14A.
To connect the breakout box to the carphone module, see Connecting the breakout box. Carphone module
To connect the breakout box to the climate control module, see Connecting the breakout box
- passenger door module (Driver's Door Module in right hand drive) #3A and Climate control module #12A and intermediate connector 54/11.
passenger door module (Driver's Door Module in right hand drive) #2A and Climate control module #14A and intermediate connector 54/11.
To connect the breakout box to the passenger door module / driver's door module, see Connecting the breakout box
To connect the breakout box to the climate control module, see Connecting the breakout box
- Climate control module #11A and Steering wheel module #19.
Climate control module #13A and Steering wheel module #9.
To connect the breakout box to the climate control module, see Connecting the breakout box
To connect the breakout box to the steering wheel module, see Connecting the breakout box
- Steering wheel module (SWM) #20 and SRS control module #25B.
Steering wheel module (SWM) #10 and SRS control module #23B.
To connect the breakout box to the steering wheel module, see Connecting the breakout box
To connect the breakout box to the SRS control module, see Connecting the breakout box
- SRS control module #26B and Upper electronic module #5 and intermediate connector 54/13.
SRS control module #24B and Upper electronic module #3 and intermediate connector 54/13.
To connect the breakout box to the SRS control module, see Connecting the breakout box
To connect the breakout box to the upper electronic module, see Connecting the breakout box
- Driver's Door Module (passenger door module in right hand drive) #3A and upper electronic module #5 and intermediate connector 54/10.
Driver's door module (passenger door module in right hand drive cars) terminal #2A and upper electronic module terminal #3 and intermediate connector 54/10.
To connect the breakout box to the passenger door module / driver's door module, see Connecting the breakout box
To connect the breakout box to the upper electronic module, see Connecting the breakout box
Other information:
- The voltage must be between approximately 1.5 V and 3.5 V
- To disconnect the battery, see Battery, disconnecting .