Conveniently my 93 300E has the auto up down window feature via the key locks. When I first purchased the car they worked flawlessly. However over the past six weeks the opening worked intermittently, and now only if its immediately after locking the door. The windows work normally in all other respects.

Suggestions, hints, experiences-

Thanks in advance

Thornton

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1993 300E
1999 E320 Estate

top for the night crowd

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1993 300E
1999 E320 Estate

The auto up function should always engage when the key is kept in the lock position after closing up the car. The auto down feature needs to be tricked into working by holding the key on the open side for a long period immediately after you've closed the car and windows with the auto close function. Your moon roof should not open with the key, but it will close with the key correct? This auto up and down feature puts a lot of strain on the vacuum pump that runs the show (I think) so don't do it too many times.

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles