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If your car has the convenience feature:
When you hold the key in the door lock "lock" position, you are simply providing a ground to one of the inputs on the convenience control module. When you then hold the key in the unlock position to roll the windows down, you are again simply providing a ground to another input on the convenience control module. I built a timer system that provides grounds to these same inputs, and is triggered by the remote. The timer is based on the 555 chip and can be built from parts readily available at any electronics shop. I will warn you--this is an electronics tinkerer type of project--don't do it if you're into that kind of thing.
Schematic and pictures attached--probably will require more explanation, but I'll wait and see if you are still interested.
J. M. van Swaay
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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
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