Mercedes-Benz C-Klasse (W204) - Sporadic malfunction of instrument panel lighting | HELLA


C-Class (W204)

Model year: from 2007 to 2014

Sporadic malfunction of instrument panel lighting

If this problem is detected in the above-mentioned vehicle, a possible cause may be damage to the wiring harness of the ambient light/rain sensor.

In addition, sporadic failures could occur in the exterior lighting function and in the wiper control caused by the rain sensor.

In the driver information system, the following message appears -- Automatic headlight failure.

- Error code B22E34A could be stored.

Repair notes

- Check the wiring harness of the ambient light/rain sensor.

- Damage can occur here in the area of the fuse box as a result of sub-standard cable routing.


Check the wiring harness for damage, repair if necessary and ensure that the wiring harness is laid correctly to prevent further damage.

Important safety note Technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only. Reprinting, distribution, reproduction, exploitation in any form or disclosure of the contents of this document, even in part, is prohibited without our express, written approval and indication of the source. The schematic illustrations, pictures and descriptions serve only for the purposes of explanation and representation of the instructions and cannot be used as a basis for installation or assembly work. All rights reserved.