BMW 730i E32 windows

[Salih2]

Hi,
my friend I am very happy to website helping me.
My BMW730i year model 1990 with E32
I have problem with windows open and close
like when i driver my car windows not work after may be 15 it work (close and open) may after 25 minutes again it stop work not close not open

your advise oplz

[HighWheels]

Salam aleikum,

I suppose this is a broken cabel inside of your door panels.
I had the same appearance on my old 735. When I followed the wiring harness from the body to the inside of the door, I found one cable broken, causing the interruption.

I often read about this problem, it is one typical kind of our E32 bimmers.

Peace,
Fred

[HighWheels]

If this failure appears at all windows simultaneously, I would suspect one of the modules "RM" or "GM" located under the rear seats at the central car electronics. Maybe only a loose connection.

[Salih2]

Hi,
My friend that happen to all windows,now which cable is must chceck first.


thx

[Erich]

my friend,

under the rear seat there are hundreds of cables. I know it because I just disassemble a car. If you cannot read wiring diagrams, then you are lost. Wiring diagrams are on my website.
But first of all do the following:
-remove the window switches in the center console and clean them. Often some drink spills into that area and the switches are not having contact.
-check on the rear windows the switches at the doors. Do they work?

If they work, then I would exclude the GM and RM under the rear seat.
But you can remove the GM and the RM and spray the contacts on them.

Broken wires in doors: usually where they go from the A-pillar into the door.
Check the drivers door first as this is most often used. Open the door and check if the windows are working in different positions of the door open.
See here