Could use some help with this one. in my 90 300E all 4 windows stop working intermittantly. Sometimes they are fine, sometimes you put them down and when you try to put them back up they are all dead. Leave the car for a few hours and sometimes they will work again...sometimes not until the next day.

I have checked fuses and ground points....they seem fine. Have checked the switches....all seem fine. All windows work when they work, so window motors don't seem to be the issue. Can not find any evidense of a short anywhere. This problem started almost a year ago and got more and more frequent over time. Now it is almost a daily issue. I can't find the culprit.

One thing...when they are dead....clicking the switches (any of them) produces a "click" sound from under the rear seat. I believe this is the location of the convenience control unit.....I will check this out next.

Anyone have this happen to them before ?

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Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey