multi function unit ?

rover rob

Well-known member
Mar 29, 2016
273
56
upstate NY
hi all . I just wanted some input on a small issue I have. I have a 98 d1 that the interior lights work sometimes or just turn on and off themselves . ( they always work when switched on manually ) along with that there is no door beeper if the running lights are on, the rear window defroster doesn't work unless the interior lights are functioning, as well as the rear fogs, the wiper intermit doesn't function and a few more things. am I wrong thinking its the multi function unit ?
 
Did You check grounding point from A pillar? Hidden rear of plastic cover you can find a multiconnector with all ground-black wires from all dashboard electric components. You should extract it, and loose and retighten 10mm nut with a bit WD-40 . May be your MFU is working without mass, and it finds sometimes its ground return through extern units, for instance lights.
You can run a self diagnosis procedure in order to check if MFU is working fine, or which input or output is failing.
This is easy to do, you can find it in the Rave Electrical Handbook.

Regards
 
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rover rob

Well-known member
Mar 29, 2016
273
56
upstate NY
The wire to the door jam switch was always cut too short. It breaks off of the connector at the switch itself. Do the lights flicker or go off and on when the pass front door is opened?
they either work perfectly or not at all. if the lights go on everything else I mentioned works as well.
 

discostew

Well-known member
Sep 14, 2010
7,706
1,015
Northern Illinois
they either work perfectly or not at all. if the lights go on everything else I mentioned works as well.
So does it act the same way with both doors? When the lights don’t come on when you open the drivers door try the passenger door. I would be looking at that big ground bulkhead Germans talking about. Or main body grounds.
 
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rover rob

Well-known member
Mar 29, 2016
273
56
upstate NY
So does it act the same way with both doors? When the lights don’t come on when you open the drivers door try the passenger door. I would be looking at that big ground bulkhead Germans talking about. Or main body grounds
I will check the grounds. its weird that it comes and goes intermittently .