1997 Mitsubishi Montero Sport LS 3.0L engine. Driver's and both rear windows work fine from driver master power window switch, but no response from front passenger window. That window works fine from the passenger side switch. Driver's side switch was used very seldom for the other windows. Last time it worked I had to push several times on the driver side switch to get the passenger window to move, but that was some months ago and now it doesn't work at all. Could this be a corroded master power window switch, or maybe something else? It is mysterious that it still works for both back windows.

 

If window works from passenger side switch but not driver, you know it is NOT window regulator or motor. Ether switch is bad or wiring on driver side. Take a switch out, figure out which contacts do what and see if you can move window by putting a shunt over appropriate contacts. If it goes - bad switch, if not - other issues.

 

Thanks very much for the advice.