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Front fog lights malfunctioning

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fog lights not working, on one or both sides.

Front fog lights malfunctioning



Fault symptoms

Fog lights not working, on one or both sides.

Diagnostic help

Check fuse 2 in the engine bay and fuse 30 in the cabin.

The following values can be read with the diagnostic tool:


- Front fog light switch


The following functions can be activated with the diagnostic tool:


- Front fog light relay


Check that the headlamps are functioning correctly. The fog lights are dependent on the main light switch and program alternative.

Check the wiring harness

Jiggle the wiring harness in several places and in various directions to detect intermittent open circuits and short circuits in the wiring harness. Watch the multimeter, diagnostic tool and test lamp during the check.