Inoperative Driver Door Window Switches

[powerdoc]

I own a '91 LS 400 and the driver door window switches don't work. The other windows are ok on their respective doors. The lock switch works. I took it apart and tried to clean some black deposits off the micro-contacts but either I did a bad job of it or that's not the answer. There are some electronics in the switch assembly of unknown purpose. Is this a common problem? Do I need to remove it again and spend more time on the contacts? Is there another answer?

[TexasLexus94]

I had a continual problem with my 94 LS drivers side switches years ago, so I tore down the guts of the assembly, and lubricated everything I could see, while cleaning all the contacts and so forth, including those little springs and the like. I'm surprised that you seem to be having such a total problem, since I would get short term improvement when I messed with the switches. But the improvements, for me, only lasted a short while, so I'd suggest you use the following method:

Spray the contacts with PB Blaster. No idea why, but this is 2 years later, and while I only use the Lex for 10,000 miles a year or so, the controls work perfectly. This is not an ad for PB-No idea who they are-I have a previous post about this subject-but it sure worked for me. I just drove today from Henderson, NV to Bullhead City, AZ to get my Powerball tickets, and the drivers side windows and locks worked great. 180 miles RT.

Best of luck.

[powerdoc]

What does the IC circuit on this board do? Does anyone know if there is a way to short the pins on the connector and check whether or not the wiring is screwed up farther down the line? I don't think it is because the window lock and the door lock work but just to be sure.

[steve2006]

Hi,

According to the wiring diagrams the common 12 volt feed to the drivers control panel for the windows is a blue wire connected to pin # 8, this also supplies the independant window switches so could be a break in the wire to the drivers panel.

Another possible cause could be the power window relay unit.

Cheers,

Steve

[powerdoc]

Will check the wires and the relay; thanks!