Trailer Lamps: Testing and Inspection

Checking trailer lighting

Checking trailer's cable harness and lights
Check cables and connectors to the trailer for contact resistance or oxidation, short-circuit to ground or voltage as well as open circuit.
Check that the trailer's light bulbs are intact.
Remedy as necessary.

Other information
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Was a fault detected?

Yes - Verification

No - Checking socket for trailer connector

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Checking socket for trailer connector
Check the socket for the trailer connector for dirt and damage to connections.
Check the socket for the trailer connector for loose connection, oxidation and contact resistance.
Remedy as necessary.

Was a fault detected?

Yes - Verification

No - Checking the wiring and terminals

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Verification




Verification

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








- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
Check function of the trailer lighting.

Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 trailer's cable harness and lights

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Checking the wiring and terminals
Check the cables and connections between the socket for the trailer connector and Trailer module (TRM) for contact resistance or oxidation, short-circuiting to ground or voltage as well as open circuit.
Remedy as necessary.

Other information
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults

Continue - Verification

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