528E rear defroster - Bimmerfest - BMW Forums

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E28 (1982 - 1988)

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Old 02-04-2010, 11:20 PM
philp123 philp123 is offline
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Location: WA
Join Date: Jul 2009
Posts: 4
Mein Auto: 1988 BMW 528e
528E rear defroster

I have a 1988 528e, whose rear widow defroster is currently not working. When I push the defrost button, it's light actually turns off. Any ideas on how to diagnose this?
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Old 02-05-2010, 11:34 AM
catso's Avatar
catso catso is offline
Location: Chicago
Join Date: Dec 2009
Posts: 3,112
Mein Auto: 2000 323i, 1988 528e
Start with the fuse, then go through the wiring. Use a voltage tester. Your accessory battery connections might be corroded.
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Old 02-17-2010, 01:19 PM
jimoreno jimoreno is offline
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Location: Parsippany, NJ
Join Date: Jul 2006
Posts: 488
Mein Auto: 2006 X3
Check the switch also. Just find a used one and replace it. Mine had an aftermarket switch that was on ALL the time. I got a used one and it has been good since then.
Jimmy Moreno
1995 530i
1986 535i
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