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Hi People,

My 840Ci passenger window will drop as if the door is being opened and then go back up again of it's own accord. There is no pattern to when it does it, and I have replaced the microswitches (although the fault still occurs with them disconnected), the window motor, the wiring to the motor, the door control module and the ECU in the passenger sill. The diagnostics show a fault in the motor wires (sensing voltage in the wires when no signal has been sent), but these have been replaced. I am quickly running out of ideas, and any help or experience of this would be much appreciated.

Many thanks,
Billy.
 

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Uber Platinum BFuk Member
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868 Posts
Check poor ground connections throughout the control system. Use contact cleaner on the connectors, including the one between the door harness and the chassis harness.
 
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