Checking the Rear Fog Lamp (Trailers)

Checking the rear fog lamp (trailers)

Checking the market
The following fault-tracing applies ONLY to cars with trailer connectors.

Is the test applicable?

Yes - Checking the relay

No - Exit procedure

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Checking the relay
Check the function of relay 2/83: Activate and deactivate the relay a number of times. The relay is functioning if there is a clicking sound when the relay is activated and deactivated.
Replace with a new relay if the relay does not function.

Other information:
- To access and replace the integrated relay/fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.









Was a fault detected?

Yes - Procedure complete

No - Checking components and wiring

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Checking components and wiring
Check that fuse 11D/2 is intact.
Check the cable between relay 2/83 terminal #3 and the trailer connector. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between the trailer connector and the ground terminal for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- For further information about signals and other values, see Signal specification Signal Specification
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box.
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.













Was a fault detected?

Yes - Procedure complete

No - Exit procedure

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