before you buy a new switch, check to see if it is the same part number as any of your remaining switches and swap them. Depending on your model you may have two different switches (part numbers) in the same car. Also check to see if you hear the motor running. If it is and the window is not moving it is probably the plastic swivel piece that rides in the track and atttaches to the glass. They tend to break eventually, not a bad repair job and the part is cheap.

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65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)