1990 GT Passenger Window stuck open

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09 Oct 2012 19:52 #11746 by Cu++er
So now my window is stuck down, & I can't drive the car. The window stops working off and on, completely intermittent. When it won't open or close, all you hear is clicking in the Control Unit canister, under the driver seat. I opened the canister, and see nothing out of the ordinary. I just ordered a new Window Switch from 928Intl and installed it, but no change. I have never had the door panel off. I read about motor potential issues, but question how that could be intermittent. I suspect that Control Unit canister, under the seat. Anyone have any ideas on where to go from here? I have spent hours looking for a schematic of that Control Unit (928 618 240 00), but cannot find one. I could sure use some help on this one.

(I think this one will be my final straw. Believe I will drive it up to Petite le Mans at Road Atlanta this month, & put a For Sale sign in the window. A real shame, since it is an almost pristine original Baltic Blue Metallic GT 5-Speed, and a blast to drive.)

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09 Oct 2012 22:29 #11751 by the flying scotsman
First thing Id look for is power to the switch then power at the window motor with the door panel off.
Double check fuse #31 and relays first.

Wiring diagram is on WSM 97-345

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09 Oct 2012 23:25 #11753 by Kiln_Red

Double check fuse #31 and relays first.


Check here first. Ensure you have a good connection. There may be some corrosion at the fuse creating your intermittent operation.

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10 Oct 2012 18:15 #11758 by pcar928fan
He says it is clicking (the control unit) so he has power to the switch...

Kent, how long have you owned it? Remember these are OLD CARS man. They are going to have some issues. Wait till your cab top quits working...this window thing will look like and BE small potato's by comparison! I have seen that with Boxsters and 911 Cabs now... CHAAAA-CHING!!! '90 GT's are pretty mean 928's too, so if you do sell it someone will get a heck of a car for sure!

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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10 Oct 2012 20:08 #11763 by the flying scotsman

He says it is clicking (the control unit) so he has power to the switch...


Perhaps...take a DVM and check for correct voltage at all locations (switch, controller and window motor) to narrow the fault then tshoot further starting with the fuse and its position on the CE.

After the voltage test check continuity of wires to where the issue is........broken wire?

If confidence is high you could use a seperate 12v source on the motor to see if it runs.

Another issue could be high impedance (resistance) of a component.

Lots to check with a simple DVM.

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10 Oct 2012 20:36 #11764 by Kiln_Red
Taking the door panels off are a breeze. Just take care to be sure that you have *all* of the hardware removed before you try to take it off. It doesn't take much to break the plastic support for the interior handle & parcel compartment. I believe there are 3 10mm bolts in total IIRC. Two inside the parcel compartment and one just inside of the cut out for the driver air vents. Be sure to get all of these 10mm bolts along with the handful of Phillips head screws and you're good to go. If you have a battery charger you can use the leads of the charger to apply direct power to the motor. If it rolls up, you can then drive the car and rule out the motor as well. That would make a nice head start toward your diagnostic work as well as get you back on the road.

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10 Oct 2012 22:01 #11765 by the flying scotsman
be very careful of the current if you use a batt charger......use trickle charge to start.

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11 Oct 2012 16:58 #11785 by Cu++er
Well, I bit the bullet and pulled the passenger door panel off. Actually alot easier than I expected. I put jumper wires directly onto the two wire lugs on the window motor, & applied 12v/2a from my trickle charger. I GOT NOTHING! So I am thinking my motor is either failed, or needs to be broken down and cleaned internally.

The million dollar question... How do I get the motor out? My window is stuck in the fully down (open) position. I cannot see how all the gears go together, back inside the door. I am afraid to start unbolting the motor, not knowing how it all links up to the lifter mechanism inside. I have not been able to find a decent guide anywhere on this one, on this forum, Rennlist or anywhere on the web. The 928 Factory Manuals don't even discuss anything about working on the inside of the doors.

Does anyone know where a decent procedure for replacing a window motor on a late model (1990) 928 can be found?

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11 Oct 2012 17:19 #11786 by pcar928fan
Dewayne needs to do a write up on this for sure! Lots of folks need to do this. I have seen it discussed somewhere (probably on RL) and while it didn't sound like it was a REALLY difficult task, it did sound fiddly...

Keep us posted and at least now you can quit chasing other stuff and if push comes to shove have just that done and save money with a mechanic keeping him from chasing stuff as well...

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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12 Oct 2012 00:15 #11797 by Kiln_Red
Kent,

Did you attempt smacking the motor with a rubber mallet while you had power to it? It may actually be better that the glass is down for removing the motor and regulator. Trust me.. This is far easier of a task than on later cars. For examplea, a late 90s GM car. With all of the "security" stuff in the way that's made to the door shell, it is practically impossible. Give it a whirl. It's really not that bad. I wish I could explain the job better but it is difficult to put into words. If you need a motor, I may have an extra.

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12 Oct 2012 07:16 #11803 by Cu++er
Got the motor out. Everything was corroded and green. Pulled it apart and cleaned all with electrical cleaner and a wire brush. All back together, but still doesn't do anything. It won't hardly turn by hand, before or after cleaning. I am ordering a replacement this AM. But everyone sells only Motor and Transmission combos. Since my transmission is still in the door and hooked up to everything, it would sure be a lot easier to just put the new motor on my old transmission. Is that a good idea, or should I not break the seal on the new Motor/Transmission pair? If not, I gotta try to figure out how the whole transmission assembly disconnects up in there. Hard to see anything!

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12 Oct 2012 07:28 #11804 by the flying scotsman
Id buy the motor with transmission then remove the transmission and install new motor in your door with stock components.

Take the time to ensure all pivot points are lubed before installing the door panel etc.

good luck

Just checked 928 Int........they sell the window motor seperate new and used.

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12 Oct 2012 09:09 #11806 by Cu++er
Picked up Motor/Transmission pair (used/tested working) from DCAuto for $90. With overnight delivery it comes out right at the same price as 928Intl's used ones. How hard is it to actually swap the entire thing out together, with the Transmission? Since I can't find a write-up on it, I was hoping to get an answer from someone who has done it.

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12 Oct 2012 12:46 #11808 by the flying scotsman
Ive done it with my NOT small hands. It takes some creative manouvering and I recall the glass being up which I taped in place.

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15 Oct 2012 10:45 #11847 by Cu++er
New motor installed. Power applied directly to window motor rolls window up and down successfully. However, window switch doesn't do anything but make the Window Control Unit click like crazy. Replaced the window switch with a brand new one, & get same. Am guessing the Window Control Unit (928 618 040 00) is failing. Anyone ever seen one of these go out? My local mechanic claims he has never seen it in 30+ years of servicing 928s. Unfortunately, I already called DCAutomotive and 928Intl, & neither have one in stock. Anyone have one they want to sell?

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15 Oct 2012 17:57 #11854 by pcar928fan
I have never heard of this either. It is possible that your sunroof had a leak at some point or the unit otherwise got wet and thus is now fried. Like I said, I have not heard of this before either. You might talk to Hans about his window button kit and see if he has thoughts on how his system might be able to replace what you have w/o breaking the bank...

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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26 Jul 2013 08:54 #15426 by TDA1
When I purchased my car, the previous owner had taken the window motor/transmission out and tried to repair it. Needless to say he didn't.
I have a new motor that works but I am unsure how the motor bolts to the bracket. Does anyone have any pictures or something I can reference so I can see how this should look?

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26 Jul 2013 12:22 #15428 by mm928
FUNNY...my window is stick down since last week,,,,I see you are further along so this is helpful. I get nothing at all and I have new switches too. So I am going into the door myself. But mine is an 83, so I do not think I have what you have.

Good luck, I am right behind you!!!

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

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26 Jul 2013 14:30 #15430 by wallyp
Be aware that the window switches for the '90 are different from those for earlier years.

Wally Plumley
928 Specialists
www.928gt.com

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26 Jul 2013 21:12 #15440 by mm928
Correcto, I got ones for my year supposedly. but they are not OEM. I had to "Dremelize" a little plastic in order to get them to seat down in properly. But they do work and fiy ok now. But alas, I must venture into the door myself now.

1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

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