About 6 months ago the driver's side power window quit working on my 1998 Integra LS. The passenger side and sunroof still work just fine, although they are pretty sluggish.

I recently had some work done at a shop and had them do some diagnostics on the window. They told me that I need to replace the Power Window Master Switch along with the motor for the driver's side window. They quoted me at $850!! This is a mechanic I've used for years and who has never unfairly charged me for work.

I called around to some other shops and they were all quoting me around the same price ($700-$900).

Why would I need to replace the Master Switch if two out of the three power windows are working just fine? Also, is $700-$900 for parts and labor to replace this sound accurate?