C6 window doing weird stuff !
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
C6 window doing weird stuff !
My C6 Z06 window is doing some strange stuff since a new battery was installed.
It only goes up and down in segments despite holding the button.
It also drops the window down a segment each time you open and shut the door - meaning it will eventually lower the window all the way down if you keep opening and shutting the door. Its as if it is stuck in the door opening mode, except it never goes back up after you shut the door.
I have tried the button reset and battery disconnect and re connect to no avail.
can this be rectified with a Tech2 ?
It only goes up and down in segments despite holding the button.
It also drops the window down a segment each time you open and shut the door - meaning it will eventually lower the window all the way down if you keep opening and shutting the door. Its as if it is stuck in the door opening mode, except it never goes back up after you shut the door.
I have tried the button reset and battery disconnect and re connect to no avail.
can this be rectified with a Tech2 ?
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
I have already done that about 20 times now, in all sorts of ways, accessory on, ignition on, both sets of controls - to no avail.
its not the usual indexing problem.
if you open the door it drops a couple of inches - close the door it doesnt go up.
open the door again and it will drop a further couple of inches - close the door it doesnt go up.
open the door again and it will drop a further couple of inches - close the door still no go up.
it will do that till the window is at the bottom.
from reading some old posts on window issues it would appear that problems like this are usually door pad or control module issues (or connector) so I will probably have to start with that.
its not the usual indexing problem.
if you open the door it drops a couple of inches - close the door it doesnt go up.
open the door again and it will drop a further couple of inches - close the door it doesnt go up.
open the door again and it will drop a further couple of inches - close the door still no go up.
it will do that till the window is at the bottom.
from reading some old posts on window issues it would appear that problems like this are usually door pad or control module issues (or connector) so I will probably have to start with that.
Drifting
Joined: Apr 2016
Posts: 1,286
Likes: 611
From: DFW Texas
OK, I didn't understand that you had performed the reindex when you stated "button reset". Do both windows exhibit the same problem or just one? If one, then I would suspect the window switch, if both, then I would suspect the Body Control Module (BCM). The windows are driven by the switch inputs to the BCM that then controls the windows.
Good luck and let us know the fix.
GD
Good luck and let us know the fix.
GD
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
OK, I didn't understand that you had performed the reindex when you stated "button reset". Do both windows exhibit the same problem or just one? If one, then I would suspect the window switch, if both, then I would suspect the Body Control Module (BCM). The windows are driven by the switch inputs to the BCM that then controls the windows.
Good luck and let us know the fix.
GD
Good luck and let us know the fix.
GD
It's just the left window that is doing it - the right side window is fine.
i have found some old threads on the subject where people have had issues with the touch pad and the switch to cause weird issues.
I guess I will have to start with those switches first.
we are going away racing tomorrow so wont be able to work on the car till Monday.
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
An update (just in case anyone is wondering) 
Replaced the window switch - no difference.
Changed over the door actuator pad - no difference.
Took it to a friends workshop, he hooked up the Tech2, cleared out some old codes and re calibrated the brake light switch.
The Tech2 showed no faults in the door module but did come up with a non defined fault within the BCM.
He said it is most likely a wiring/solder/joint type problem within the BCM or associated wiring looms.
We went through the window indexing procedure again a couple of times - no difference.
Will be taking it to a highly regarded auto electrician next to see if he can diagnose the problem.
Replaced the window switch - no difference.
Changed over the door actuator pad - no difference.
Took it to a friends workshop, he hooked up the Tech2, cleared out some old codes and re calibrated the brake light switch.
The Tech2 showed no faults in the door module but did come up with a non defined fault within the BCM.
He said it is most likely a wiring/solder/joint type problem within the BCM or associated wiring looms.
We went through the window indexing procedure again a couple of times - no difference.
Will be taking it to a highly regarded auto electrician next to see if he can diagnose the problem.
Drifting
Joined: Apr 2016
Posts: 1,286
Likes: 611
From: DFW Texas
Thanks for the follow up & it's a bummer that it has become this complicated. Hopefully you get some good news for an identification of the problem and a fix. Stuff like this can drive you nuts.
Good luck and keep us informed as someone else is bound to have similar issues and can learn from your experience.
GD
Good luck and keep us informed as someone else is bound to have similar issues and can learn from your experience.
GD
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Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
Its time for another update (on one of the most problematic cars I have ever owned 
)
Now the brake lights have stopped working altogether (since the re calibration) and the cruise control has stopped working.
I have taken it to the auto electrician who has checked all the wiring and circuits and window issue, says that the problem must lie in the BCM.
So being in Australia I have to buy one via the net, and it would appear that actually finding someone that has one in stock is a challenge. Even Rockauto doesnt have any. They have some on Ebay but the Global shipping program should be renamed the Goslow shipping program.
Anyway ordered one from Summit - who dropship from the supplier.
Also unrelated, the LHS low beam bulb has blown, but I already had to replace the RHS a little while ago, so I guess it was to be expected.
)Now the brake lights have stopped working altogether (since the re calibration) and the cruise control has stopped working.
I have taken it to the auto electrician who has checked all the wiring and circuits and window issue, says that the problem must lie in the BCM.
So being in Australia I have to buy one via the net, and it would appear that actually finding someone that has one in stock is a challenge. Even Rockauto doesnt have any. They have some on Ebay but the Global shipping program should be renamed the Goslow shipping program.
Anyway ordered one from Summit - who dropship from the supplier.
Also unrelated, the LHS low beam bulb has blown, but I already had to replace the RHS a little while ago, so I guess it was to be expected.
Racer
Joined: Sep 2019
Posts: 488
Likes: 206
From: Indy `O=o-
2020 C6 of the Year Finalist - Unmodified
I don’t understand why engineers have to over engineer everything, there’s absolutely no reason an electric window needs to be computer controlled. Even the window indexing could be done electromechanically fairly simply.
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
In the C6 the electronic door pad and window button talks to the door control unit, which then talks to the BCM to perform all functions.
who needs all that to open a door and open a window.
If anyone is wondering what could possibly go wrong - then I can tell you.
Race Director
Joined: Dec 2002
Posts: 10,461
Likes: 1,149
From: Wayne Township WI
I feel your pain, really do.
Spoke w/ a design engineer I'm acquainted with.
Essentially asked why electronic control(s) when mechanical worked just fine for ages.
Said it's all about weight saving.
Weight savings resulting in psychiatric angst, and expense, to the moon.
Check, got-it.
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
I feel your pain, really do.
Spoke w/ a design engineer I'm acquainted with.
Essentially asked why electronic control(s) when mechanical worked just fine for ages.
Said it's all about weight saving.
Weight savings resulting in psychiatric angst, and expense, to the moon.
Check, got-it.
its funny how they talk about weight saving, while the cars keep getting heavier and heavier
My Z06 has alloy frame, magnesium subframes and roof, plastic and carbon fibre panels etc etc, yet its still heavier than my C4 !
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
Another update !
After a long search a BCM was finally located (via GM partsonline) and shipped to Aus.
The new BCM was fitted and re flashed - fixed the brake light problem and the active handling warning.
Did NOT fix the window issue - looks like the module in the door is the problem (as someone has already suggested)
A new left window assembly was purchased (Rockauto) and shipped.
Auto Electrician fitted new assembly - guess what it wont work !
Remember that this car has been converted to Right Hand Drive, looks like they actually swapped the left and right door modules over to make the controls work from the right drivers side.
The car requires a right hand module to be fitted to the left hand door.
Does anyone know where I can purchase a right hand module (I dont know if they can be bought separately from the complete unit new)
A parts supplier that would have a second hand unit would be ok ?
After a long search a BCM was finally located (via GM partsonline) and shipped to Aus.
The new BCM was fitted and re flashed - fixed the brake light problem and the active handling warning.
Did NOT fix the window issue - looks like the module in the door is the problem (as someone has already suggested)
A new left window assembly was purchased (Rockauto) and shipped.
Auto Electrician fitted new assembly - guess what it wont work !
Remember that this car has been converted to Right Hand Drive, looks like they actually swapped the left and right door modules over to make the controls work from the right drivers side.
The car requires a right hand module to be fitted to the left hand door.
Does anyone know where I can purchase a right hand module (I dont know if they can be bought separately from the complete unit new)
A parts supplier that would have a second hand unit would be ok ?
5th Gear
Joined: Oct 2025
Posts: 5
Likes: 0
From: Sydney Australia
I have the same problem
Hi, I see by your profile that you have sold your C6.
I was wondering if you resolved your window problem before you sold your car?
I too live in Australia and have a right hand drive converted C6 with the passenger window only going up and down in segments when using the window switch. The window also drops more and more if you open and close the door continuously.
I was wondering if you resolved your window problem before you sold your car?
I too live in Australia and have a right hand drive converted C6 with the passenger window only going up and down in segments when using the window switch. The window also drops more and more if you open and close the door continuously.
Intermediate
Joined: Sep 2024
Posts: 32
Likes: 17
From: Sacramento
I had a weird issue with the rear tail, brake, reverse, hazard and turn signal lights were all completely out. It was the BCM doing weird stuff and I was told GM cars do weird things if you let them sit too long without turning them on. I disconnected the battery and touched the two ends for 45 seconds to draw out all of the power out of the BCM and reconnected the battery the following morning and they've worked ever since. It's worth a shot.
Thread Starter
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
Hi, I see by your profile that you have sold your C6.
I was wondering if you resolved your window problem before you sold your car?
I too live in Australia and have a right hand drive converted C6 with the passenger window only going up and down in segments when using the window switch. The window also drops more and more if you open and close the door continuously.
I was wondering if you resolved your window problem before you sold your car?
I too live in Australia and have a right hand drive converted C6 with the passenger window only going up and down in segments when using the window switch. The window also drops more and more if you open and close the door continuously.
It now goes up and down perfectly, friends of ours still own the C6 and have had no problems with the windows.