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JK McDonald JK McDonald is offline
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Join Date: Oct 2003
Location: Texas
Posts: 1,026
Relay Clean Up -

Hey Autobahn - One of the output electrical contacts of the several simple +12 volt relays inside your window control unit is often your problem. With the outer housing removed - each of the main relay contacts are visible and can be inspected and easily cleaned. Check the relay coils for a darkened winding or heat damage.

I've successfully used electrical contact cleaner (or alcohol) and then gently drawn a business card type material cut into thin strips through each relay contact to clean any carbon build up. Just a very light touch is all it normally takes and be careful not to distort the geometry of the relay arms. The logic circuitry is pretty tough so as long as the external switches, connector in/out pins and the internal relay contacts are clean - it can come back to life.

Good Luck - Michael
1984 928S - "Miss Purdy"
1987 911SC - "Frau Helga"
1986 930 - "Well Hung"
1975 911 Targa "Blue"

Last edited by JK McDonald; 01-14-2020 at 03:35 PM..
Old 01-14-2020, 03:30 PM
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