Button illumination

Read the instructions below then start the fault diagnostic procedure.

Symptom: Button illumination malfunctioning

Button illumination

Fault symptoms

Button illumination malfunctioning

Diagnostic help

Check that the courtesy lights are working. If not: check fuse 8.

The following values can be read with the diagnostic tool:

-	Rheostat Filtered

-	Rheostat Night Panel Filtered

-	Night Panel (Bus from SID)

The following function can be activated with the diagnostic tool:

-	Button and control illumination PWM output

Checking the wiring harness

Jiggle the wiring harness at several points and in several directions to detect intermittent open circuits and short circuits. Note the reaction of the multimeter, test lamp or diagnostic tool during the check.