My passenger power window works sometimes and then stops working. This has been happening on and off for the past month or so. It this a problem with the window switch or do I need to take off the door panel and check the connections? Has this happened to anyone before?

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

It could be either, but I would lean toward the switch.

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Prost!

The switch commonly fills with dust and debris and when my kids were small, crumbs. The good news is that you can remove these switches and carefully pry them apart with a small screwdriver, clean them and put them back together. Of done it a number of times with great success.