Quote:
Originally Posted by jlex
You'll be throwing your money away on switches if it's not a switch problem. Verify first. I'm thinking you're going to find out it's a mechanical problem with the motor: it's binding up from time to time. May be able to cure it by removing it & taking it apart & cleaning & re-greasing it.
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While I'm generally not a fan of the shotgun approach to diagnosing problems, given how frequently these window switches fail, it's not a bad idea to rule out a faulty switch first. This could be done by buying (or borrowing) a single replacement switch. Specifically, replace the switch on the passenger door and see if this rectifies the intermittent problem. If it does not, swap the wires on the 2 driver's side switches (since the driver's door window consistently works fine and is known-good) and see if that fixes the problem. If it doesn't, put all back to original and store the purchased switch as a spare to replace one of your existing switches when it (inevitably) fails