Window motor failed? '93 C4 advice needed.
Thread Starter
Melting Slicks
Joined: Oct 2012
Posts: 2,156
Likes: 273
From: Dunedin NZ.
Window motor failed? '93 C4 advice needed.
While replacing the RH door window weather seal I powered the window closed and now it won't go down. There is power to the door switch and when I meter the brown and blue wires leading to the motor there is continuity. Wirings not my strong point so if I want to test the motor with a separate battery do I put the + and - to these two wires or - to ground and + to one of these wires? Just want to be sure before I make smoke come out of anything!
FWIW LH window is working normally and the RH window will not work from the LH control either.
FWIW LH window is working normally and the RH window will not work from the LH control either.
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
This is a +.- situation. The motor needs power to run while sensors need a ground to measure resistance.
Are you sure you just dont have an obstruction or something preventing the window from moving? I find it odd that it was working until you took the panel apart. Maybe you jsut jimmied something tight or loose?
Are you sure you just dont have an obstruction or something preventing the window from moving? I find it odd that it was working until you took the panel apart. Maybe you jsut jimmied something tight or loose?
Thread Starter
Melting Slicks
Joined: Oct 2012
Posts: 2,156
Likes: 273
From: Dunedin NZ.
Ok, will use a battery to power the tan and blue feed directly to the motor and see what happens. I suspect that lack of use may be the problem? Motor commutator dirty maybe? Anyway, I will persist and see if I can find anything before I have to pull the motor out. I see it is recommended to replace the whole mechanism, this will be an "ouch" moment here given current exchange rate and freight.
This car is a recent import here, former California car that must've sat a lot because the tires were date stamped 2001 but had very little tread wear. Needless to say I replaced these as a precaution (the sidewalls were starting to crack).
This car is a recent import here, former California car that must've sat a lot because the tires were date stamped 2001 but had very little tread wear. Needless to say I replaced these as a precaution (the sidewalls were starting to crack).
Last edited by Haggisbash; Aug 25, 2018 at 03:14 PM.
Thread Starter
Melting Slicks
Joined: Oct 2012
Posts: 2,156
Likes: 273
From: Dunedin NZ.
Powered the motor directly and it works perfectly, if you open the window with a direct connection to the motor and then connect the switch again you can close the window but not open it. So seems I need a new RH window switch? But why won't the LH switch operate the RH window?
Advanced
Joined: Jul 2017
Posts: 93
Likes: 18
From: Texas
Try to measure the switch connections and see if they close like they should. It's been a while since I had mine apart, but I had a loose wire that would let me open the window, but not close it. I don't remember how it's wired on the corvette, but I have a mustang that when the passenger switch is disconnected the drivers door can't open the passenger window. Much cheaper to connect a wire or change a switch than the motor/assembly.
Thread Starter
Melting Slicks
Joined: Oct 2012
Posts: 2,156
Likes: 273
From: Dunedin NZ.
I know its not the motor, it works fine when tested with a battery connected directly to it. The RH switch is hard to come by so wondering if anyone knows how to open one up without destroying it?
I see one of the vendors has it but at around $90 (thats $134 plus freight here) I figured it would be worth seeing if a clean up of the contacts would keep it going for a while longer.
I see one of the vendors has it but at around $90 (thats $134 plus freight here) I figured it would be worth seeing if a clean up of the contacts would keep it going for a while longer.
