If, in the case of the above-mentioned vehicle models with automatic running lights, the headlights are not set on "AUTO" in the headlight control switch, a possible cause of failure may be a defective ambient light sensor.
This sensor is integrated in the rain sensor module.
When troubleshooting, first check the manual switch functions, the wiring and then the power supply for defects.
If no further faults are found, the ambient light sensor should be checked and replaced if necessary.
Please follow the repair instructions specified by the vehicle manufacturer for the carrying out of such work.
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.