My mirrors both folded, but would not stay folded. I lifted the switch out of the door panel and checked the circuits with my multimeter to help diagnose where the problem was. It turned out that the micro-switch in the mirror was okay, but the problem was the tiny metal lever that opened/closed the micro-switch when the mirror folded. One just needed to be bent a bit in order to press the switch. The other must have jammed and was completely folded in half. I just had to straighten it out for it to work.

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Rick
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2005 BMW X5 4.4 (Highland Green - Beige interior)
1978 Porsche 928 (Copper Bronze - Cork interior)