94 power window problems
Thread Starter
Team Owner
Joined: Feb 2003
Posts: 54,106
Likes: 9,421
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
94 power window problems
my passenger side window wont work. so I replaced both switches with no luck. the driver side works fine. So I followed the FSM instructions and with out doing anything it started to work. only lasted a day. today I did the same thing and still got nothing but on the flow chart in the FSM I got stopped on the second box. the answer was replace LH switch. do you really think I got a bad switch. or is there anything I can do to make it work.
Thread Starter
Team Owner
Joined: Feb 2003
Posts: 54,106
Likes: 9,421
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
Advanced
Joined: Oct 2011
Posts: 98
Likes: 4
From: Canaseraga NY
I see this quite abit at work. Power goes to driver switch, then passenger switch,then to window motor. Pull passenger panel unplug connecter from motor, Make sure you have good ground with test light. Hold test light on connecter ends operate switches, if light goes on and off motor is bad. If light does'nt come on check for power leaving driver switch. If no power leaving switch, its bad (you can get faulty parts new) See it more today then yester year. If power is present Check for power coming into passenger switch, If no power then its in the wire between the two( Hard to find and get to ) If power is present coming into switch, check for power leaving switch, if not bad switch. If power is leaving switch its in the wire between pass. switch and motor( useally where wires leave body and enter door) If you have to diagnos it this far. ) 9 out 10 its the motor or switch. Hope this is of some help, and nice ride.
Race Director
Joined: Dec 2006
Posts: 10,383
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I'd wager there is an open in the motor's coils. When it happens to stop with the brushes on either side of the open the motor is inop. Sharply closing the door a few times might jar it into a position where the brushes don't span the open. The motor is the culprit I'm 90% sure of it.
Thread Starter
Team Owner
Joined: Feb 2003
Posts: 54,106
Likes: 9,421
From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
I'd wager there is an open in the motor's coils. When it happens to stop with the brushes on either side of the open the motor is inop. Sharply closing the door a few times might jar it into a position where the brushes don't span the open. The motor is the culprit I'm 90% sure of it.
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Team Owner
Joined: Aug 2008
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From: Rochester NY
St. Jude Donor '09 thru '26
Where did you find the replacement switches? Are they the same on the 94 as a 92? I looked at the usual vendors and kept finding "discontinued" or "out of stock". 
Racer
Joined: Jul 1999
Posts: 292
Likes: 0
From: Vandergrift, PA, USA PA
Last summer my power window switch went bad on the driver's side. It wouldn't operate the passenger side window. I got a new switch from Keen Parts. This summer the passenger side switch wouldn't work the window so, again, I got the switch from Keen Parts. They are listed on the left side of the chat home page with all the vendors.
www.keenparts.com
www.keenparts.com
Team Owner
Joined: Aug 2008
Posts: 33,026
Likes: 6,540
From: Rochester NY
St. Jude Donor '09 thru '26
Thanks Mailman, I'll check that out in the AM and get one ordered. 
Bad enough I'm waiting on parts for the AC, but when the driver's window won't work either it gets a bit warm! 
Bad enough I'm waiting on parts for the AC, but when the driver's window won't work either it gets a bit warm!
Instructor
Joined: May 2012
Posts: 148
Likes: 1
I'd wager there is an open in the motor's coils. When it happens to stop with the brushes on either side of the open the motor is inop. Sharply closing the door a few times might jar it into a position where the brushes don't span the open. The motor is the culprit I'm 90% sure of it.
Just because the window motor works once again does not absolve it of any defects, rather think it may have an intermittent.
The key here is having and knowing how to use test equipment like a test light or a meter. That will pinpoint your problem, save you time and money.
Skip that and what other choice do you have but to keep throwing parts at it until it works? Highly unlikely but it could be in the wiring and replacing a motor could leave you 0 for 2 fixing things that aren't broke.
To me passenger window operation is imperative, especially if entertaining the occasional passenger that enjoys cheap beer and spicy food
Regards,
Team Owner
Joined: Aug 2008
Posts: 33,026
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From: Rochester NY
St. Jude Donor '09 thru '26
Keen Parts does not have any - GM has discontinued it and apparently nobody is making a replacement. You would think there are enough C-4's out there getting along in years that it would be worth making the part.
Anybody know of a good C-4 junk yard?
Anybody know of a good C-4 junk yard?
Advanced
Joined: Jul 2023
Posts: 64
Likes: 31
From: New Hampshire
I'd wager there is an open in the motor's coils. When it happens to stop with the brushes on either side of the open the motor is inop. Sharply closing the door a few times might jar it into a position where the brushes don't span the open. The motor is the culprit I'm 90% sure of it.
I have a 94 as well and the Pass window stopped working in the closed position one day. I took the door panel off and verified power through the switch as appropriate. Listening carefully I could hear faint clicking inside door when moving the switch, so I got power to motor. I gave the bottom of the door a few hard wallops with my fist and the motor came back to life. So I am assuming intermittant open in the motor and going to replace it. Does this sound like the right move?
thanks!
Racer
Joined: Sep 2011
Posts: 462
Likes: 30
From: Riverside California
I have a 93, same problem. After checking electrical stuff gave the motor a couple of blows with the hammer handle. To my surprise motor started to work, that was 2 years ago still working as it should. Not going the hurt anything by giving it a wack, might just fix it.
