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1990 Transport Power Window Problem

I have a problem with my windows in that I can't isolate what is going on. Both the driver's and the passenger's windows will not work. I have checked the motors directly by bypassing the switches and they will go up and down. But when I put the switches back in, the windows quit. I thought that the switch was bad and replaced it twice with the same results. I have not been able to get the schematics for this car, but similar GM cars seems to have the same wiring that I have in the Pontiac. What I don't understand further is that one of the wires to the moter seems to be always hot even though the schematics show that both wires to the motors should be running to ground.

I checked the switches from the drivers side with a multimeter and the following is what I got:

Pin Wire Color Door Left Switch Right Switch Designation switch Continuity Test with Pink (Hot) Wire Position Down Neutral Up Down Neutral Up

1 Blue-White Right No No 1/2 No No Yes 2 Black Ground No No 1/2 No No No 3 Blue Left No No Yes No No No 4 Tan Right No No 1/2 Yes No No 5 Brown Left Yes Yes 1/2 Yes Yes Yes 6 Grey Unknown No No No No No No

Continuity Test with Ground Wire Position Down Neutral Up Down Neutral Up

1 Blue-White Right Yes Yes Yes Yes Yes No 2 Black Ground Yes Yes Yes Yes Yes Yes 3 Blue Left Yes No No No No No 4 Tan Right Yes Yes Yes No Yes Yes 5 Brown Left 1/3 No Yes No No No 6 Grey Unknown No No No No No No

In my opinion of the schematics that I saw for the GM type car door, with both switches in the neutral position, the Brown wire should not have continuity with the pink wire, and should have continuity with the Ground wire. It is apparent that this is not happening. I can't believe that I had three bad switches.

Can anybody help me with this. It gets hot in texas, and we need to get those windows open.

Thanks

Bob Hengstebeck

Reply to
Robert A Hengstebeck
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Bob,

Your continuity table's columnar format did not survive when you posted this. It's giving me a headache trying to decipher your findings. Can you try a different technique of displaying your results here?

Reply to
Silver Surfer

Let me try again with the chart:

I checked the switches from the drivers side with a multimeter and the following is what I got:

Continuity Test with Pink (Hot) Wire

Pin-----Wire Color--Door----Left Switch----------Right Switch

--------Switch Position---Down Neutral Up---Down Neutral Up

1-----Blue-White--Right----No--No--1/2-----No---No----Yes 2-----Black-------Ground--No--No--1/2-----No---No-----No 3-----Blue---------Left-----No--No--Yes----No---No-----No 4-----Tan----------Right---No--No--1/2-----Yes--No-----No 5-----Brown-------Left----Yes--Yes-1/2-----Yes---Yes----Yes 6-----Grey------Unknown--No--No--No---- No--No------No

Continuity Test with Ground Wire (black)

--------Switch Position---Down Neutral Up---Down Neutral Up

1------BlueWhite---Right--Yes--Yes---Yes----Yes--Yes----No 2------Black-------Ground-Yes--Yes--Yes----Yes---Yes---Yes 3------Blue---------Left----Yes--No---No-----No----No---No 4------Tan---------Right---Yes--Yes---Yes----No---Yes---Yes 5------Brown-------Left---1/3---No---Yes----No----No----No 6------Grey-----Unknown--No--No---No-----No----No----No

Reply to
Robert A Hengstebeck

Preliminary thoughts:

The gray wire might be going to the "express down" window module.

Does your master switch assembly have a "lockout" button on it?

I assume that your machine has power windows on the "front" doors only? Nothing for the "rear"?

Reply to
Silver Surfer

Let's consider the right side window first. When you disconnect the wiring at the switch assembly can you read the motor's resistance between the TAN and DKBLU/WHT wires? Your readings have me convinced that there is an open circuit to the right side motor. Loose connection or broken wire.

Still thinking about the left side. You may have more than one problem to fix.

Reply to
Silver Surfer

Dear Silver Surfer: I am Bob Hengstebeck's daughter writing in response for him since he just got home from work and he is very tired and exhausted. He had said to me to write you in response which is all to who had read this article of my father's. Well he said he will check it out one his next day off which is Thursday but until thank you for the help. He will get back to you on how that goes when he can.

Reply to
Robert A Hengstebeck

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