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No need to remove door panel, the switches can be carefully pulled out and inspected and replaced. Make sure and note how the wires are attached. Plenty of threads on this subject. The switches are very unreliable from my experience. I did have a broken wire in the passenger side wiring but that is far less likely than a buggy switch.
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Buck
'88 Coupe, '87 Cab,
'88 535i sold, '19 GLC 300 DD
Warren Hall, gone but not forgotten
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