Just put our '95 E320 wagon back on the road after sitting for over a year. Drove it a few days, no problems. Yesterday, the car was getting its safety inspection and the mechanic put the window down. However, it won't go up; none of the other windows are working, nor is the sunroof. I don't think the front wiper is working either. Lights, blower, radio, etc still work. Car runs fine. Fuses are all fine. When pressing a window switch, the relays in the comfort module under the rear seat click, but no window operation.

Pressing the button for the rear window defogger activates the amber light, but it goes out as soon as the switch is released.

Is it possible a failing engine harness could affect the power window operation? I thought that only controlled engine-related functions. It is the original harness. 3 days ago, the sunroof would not close from the tilted up position. I used the manual close to move it and then after that the roof worked fine.

Any ideas? Right now the window is stuck down. Car has 125k miles. We're putting it back in service because its a nice car and gets better fuel economy than our other vehicles.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro