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D2 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc

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  #1  
Old 19th March 2017, 02:36 PM
jarre jarre is offline
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Default Door and footwell lights not working

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?

In the trunk there is a black box on the right side under the fuses. What is that?
Some earlyer owner has disconnect one of two positive wires from that box. Is there some reason why he had done that?
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Old 19th March 2017, 04:11 PM
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steamship steamship is offline
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Quote:
Originally Posted by jarre View Post
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?

In the trunk there is a black box on the right side under the fuses. What is that?
Some earlyer owner has disconnect one of two positive wires from that box. Is there some reason why he had done that?
Do you mean like the following photo:



If so, that is the electrics for the heated windscreen. You can ignore the red wire at the extreme left of the photo. That was the power for the rear blind I fitted.
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My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts

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  #3  
Old 20th March 2017, 03:48 PM
jarre jarre is offline
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Yes. That´s the same box.
I quess that someone has replace the windscreen as normal one and "delete" the heating system.

Any ideas with the lights?
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Old 20th March 2017, 04:24 PM
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moltuae moltuae is offline
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Quote:
Originally Posted by jarre View Post
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).
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