Button Lighting Malfunctioning

Button Lighting Malfunctioning:

Fault symptoms
Button lighting malfunctioning

Diagnostic help
Check whether the interior lighting is working. If not: check fuse 4 in the cabin.

The following values can be read with the diagnostic tool:
- Rheostat Filtered
- Rheostat Night Panel Filtered

Night Panel (Bus from SID)

The following functions can be activated with the diagnostic tool:
- Button and control illumination PWM output

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.

Measures