I just can't figure out where is the problem right now.

My central locking is working but I have to lock the car twice as first time locks just opens up again. Problem is at rear doors since the microswitches doesnt even light up interior lights. I changed those microswitches with no luck.

Front door microswitches works fine and lights up the interior...

Should there be +12v on the microswitch connector or what?

Then my front power windows opens up nicely but when I'm trying to close them they only up about 5cm at the time... So I have to click the button again and again and again until the window is closed. Where could that problem be?

It's fun to see how many electric problems E34 Touring has. Rear hatch wiring harness is fixed, though it's waiting for new harness...

I have a similar issue, I'll watch your post...good luck.

I'm hearing that the general module (black) controls interior lights (microswitches) and also power windows. Could it be that the module is broken?

Under back seat, GM module and a few fuses. Mine was fixed by replacing a blown fuse...take a look.

I've checked fuses many times. Everything is ok. I took the GM module out but by looking at it everything seems ok. Solder points are ok.

Im at work (not looking at my car) where do I look for the GM at? Under the back seat? How do I know if thats the instigator? I know, alot of questions:)

I got zero voltage at the rear door microswitches. Front door gives 11.8v. So I'm guess it's wiring problem between GM module and microswitch or ground problem since both rear door switches are out. Gotta go into it more tomorrow.

GM module is under rear seat. Left side of the car. Under plastic cover. You really can't tell for sure that it's ok by looking at it... You would need another GM module test.

Nobody got hint on the power window issue?

I had to double lock my doors and had weird issues with my rear tail lights. The tail light issues got worse - I found that the wire bundle was frayed near the trunk lid hinge. I fixed the broken and shorting wires and now my doors lock first time and the truck lock works with the rest of the doors.