BMW 3 series - Licence plate lights fail | HELLA

If a customer complains about the above error, this is not necessarily caused by the light source. High levels of humidity in the lights corrode the contacts (see Fig. 1). Capillary action in the cables can then bring water into the contact switch. This generally leads to corrosion in the switch, which prevents sufficient contact. The trunk lid may sporadically lock and unlock. In this case, proceed as follows: