1991 300d power windows inoperable

I have a 300d and the power windows dont work with any of the switches in the councel or the doors. The sunroof works and when you use the key in the door you can operate the windows.Any Ideas would be helpful.

Forums

Body and Interior Specific Aid

Chassis Model Number

W124

Electrical problems are

Electrical problems are very hard to diagnose via email and shorts and open circuits are almost impossible. Many times it can be more than one problem masking the diagnosis. Often, just replacing a part will not fix the problem as there is usually an electrical reason why the problem surfaced in the first place. Electrical testing tools and wiring schematics may be needed as well as a good understanding of automotive electricity. If you lack the above, we recommend you take the car to a good auto electrician in your area (in most cases it does not need to be a Mercedes specialist). Here are a few additional recommendations:

If the problem is you are not getting power to a component or circuit (like your power windows), first check with a 12 volt meter that you are getting power to the fuse at the fuse box. Make sure you are testing the correct side of the fuse holder. Just because a fuse looks ok does not mean it is making good contact. Replace the fuse to be sure. If there is no power to the fuse in question, it could be your ignition switch is bad.
Low battery voltage can cause all kinds of problems especially on 1986 and newer models that use various electronic computer controls. Take your car into any good auto parts store and have them test your battery under load and voltage output with everything turned on and the engine running. They will do this free of charge.

Sorry we are not able to give you more specific answers. That is the nature of electricity. Hope this does help.

Kent Bergsma

To original posted question...

What do you mean exactly, when you say," When you use the key in the door the windows work."???