Fault-Tracing Information

Fault-tracing

Checking the wiring and terminals








- Disconnect any connection from the socket for the tow hitch connector.
- Ignition off.
- Cut off voltage feed to Trailer module (TRM) by removing the battery's minus cable.
- Disconnect the connector for the Trailer module (TRM).
- Disconnect the connector from the vehicle's left tail light.
Check connectors for damage to pins and connections.
Check the connectors. Check for loose connections. Check for contact resistance. Check for oxidation.
Check the lead for open circuit or short-circuiting to ground.
Take readings between:
- Trailer module (TRM) #C2:3(#24) and the connector for the vehicle's left tail light #C1:6.
- The vehicle's left tail light #C1:6 and central electronic module (CEM) C2:59.
Remedy as necessary.

Other information
- Trailer module (TRM): Connecting the breakout box Connecting Breakout Box, Trailer Module (TRM)
- Central electronic module (CEM): Connecting the breakout box Connecting Breakout Box, Central Electronic Module (CEM)
- Trailer module (TRM): Signal specification Signal Specification, Trailer Module (TRM)
- Central electronic module (CEM):
- For further information, see the wiring diagram.
- Battery disconnecting and connecting Battery Disconnecting and Connecting
- Trailer Module (TRM) Removal and Replacement
- Central electronic module (CEM):
- Checking wiring and terminals Checking Wiring and Terminals

Continue - Verification

-------------------------------------------------

Fault-tracing information

Attempt New Test - Checking the wiring and terminals

-------------------------------------------------

Verification




Verification

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




- Reinstall the connectors, components etc.
- If the battery negative lead has been removed:
Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds.
Read diagnostic trouble codes by clicking the VCT2000 symbol.
If the fault is intermittent, the fault has been remedied.





Is the fault intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

-------------------------------------------------