Man, those switches can be a pain if they're the same ones as in my 126. Those two ball bearings can be a to get back in properly. I have had problems with them before. One time one of the copper contacts that is riveted into the throw arms fell out and lodged itself between two terminals. This caused issues, obviously. I was actually able to solder it back on to the throw, but nevertheless the switch despite testing okay with a DMM would still blow a fuse if you attempted to lower the rear window from the center console switch but mysteriously would work fine if you did it from the defective rear switch. Bizarre.

Before I get too anecdotal here, you need to figure out a couple of things. First, are you getting voltage back there? This will help us determine whether we have an electrical, electro-mechanical, or purely mechanical issue. Check your fuses. On my 126 the fronts and rears are fused separately, and if I recall correctly, across sides. For example my front passenger side window is on the same fuse as my rear driver's side. Why they did that is anybody's guess. But check your fuses.

Second, after you have determined that you ARE getting voltage back there and there isn't some other issue, you need to determine if the motor's shot or the mechanism is jammed for some reason or another. On my 126, the slide jaw for the rear window breaks regularly and this is lame to fix, bit cheap. Listen for sounds of the motor struggling. If you hear some evidence of this then the cause is probably mechanical rather than electrical.

I wouldn't be surprised if the windows hadn't been left in the up position so long that they've stuck inside the track and the motors just can't overcome the initial torque of breaking free. Try having someone grab the glass from both sides with the door open and push down as you actuate the window switch. Don't let them overdo it, though. Don't do this 5 minutes before a rain shower either, in case getting it back up is difficult.

Go from there. Determine if it's electrical or not. Then come back for more detailed help from me or one of the many more knowledgeable people than myself.


Good luck.