Communication Fault

Communication fault

Checking the wiring








- Ignition off
- Disconnect connector D on the rear electronic module (REM).
The diagnostic trouble code (DTC) is stored if there is no communication between the rear electronic module (REM) and the parking assistance module (PAM). This may be due to a fault in the signal cable between the control modules or a defective communication device in one or all of the control modules.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Rear electronic module (REM) terminal #D32 (#32) and parking assistance module (PAM) terminal #A12.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Rear Electronic Module (REM)
- Signal specification, Rear electronic module (REM) Signal Specification, Rear Electronic Module (REM)
- Parking assistance module (PAM), replacing Parking Assistance Module (PAM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals

Was a fault detected?

Yes - Verification

No - Replacing the control module

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Replacing the control module
Try a new parking assistance module (PAM).
Remedy as necessary.

Other information
- Parking assistance module (PAM), replacing Parking Assistance Module (PAM), Replacing

Continue - Verification

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Verification





Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Switch off the ignition. Wait at least 15 seconds
- Reinstall the connectors, components etc.
- Ignition on for at least 5 seconds
- Move the gear selector lever to back-up (reversing) (R).
The parking assistance module (PAM) is activated by pressing the switch on the lower section of the climate control module (CCM). Click on the VCT2000 symbol to read off the diagnostic status from the parking assistance module (PAM).
Check that the parking assistance module (PAM) is active. Check that the sensors are OK.





Is the parking assistance module (PAM) active? Are the sensors OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information





Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the wiring

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