Door and footwell lights not working

[moltuae]

Originally Posted by jarre

S8 D2 2000
DIS shows that all the doors are open if i open the driver door.
Door lights and footwell lights doesn´t work either.

Any ideas what is wrong?

My guess would be either the 'Entry and footwell lighting relay (J348)', or the fuse that supplies it with a positive feed.

See this pdf:
Current Flow Basic equipment From model year 1999.pdf

... especially pages 38, 39, 452, 457.

If there's no positive supply to the bulbs to keep the voltage to the DIS 'pulled up', activating one door switch (which appears to pull one DIS input to ground) is possibly pulling all the DIS inputs to ground through the bulbs (via the 'floating' positive connection).