I have a 1999 BMW 328iS. Windows don't work! Have done a lot to troubleshoot the problem! What next?
It might be a coincidence with the sun roof, but all makes and models of cars have window and door lock problems with age. Two things happen as a car ages. In most cases, the drivers door opens and closes more often than the rest of the doors, also your more likely to leave the drivers window open and it rains in on the controls. The majority of the time, it's the wiring at the door hedge that bends back and forth & breaks when you get in and out of your vehicle. Everyone's situation is different depending on use/mileage.
Example: Delivery driver, miles 50k window/door lock problem.
Highway daily driver 150k miles with no problems.
You can sometime check this your self. Turn on your ignition where the windows should work. "engine does not have to start" Sit in the drivers seat, hold down the window up/down button while moving the door in question to open & close. If the window tries to move at any time, the wires are wore in half. This does not always work, but I have had great luck trouble shooting electrical door problems using this method. If you have doors with no wires, clean the contact points. Hatchbacks & minivans use this system. Hope this helps.
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