I just had this window indexing problem develop today. I went out to my car and opened the door then closed the door. Upon closure the window moved up into the channel like it's supposed to and then started cycling up and down continuously within the index range. The only way to stop it was to open the door. Then when I closed the door it would start cycling again.

Next I jumped in and tried to put the window down. No response. I put it in accessory mode and the window kept cycling and no response to switch up or down.

Next I started the car and after holding the switch down the window went through a few more up/down cycles the gave me control and I was able to put the window down and stop the cycling. But while still running if put the window up and opened and closed the door the cycling would start all over again until I held the switch down for a few seconds to regain control.

At this point I tried re-indexing the window but it did not fix the problem. As soon as I open and close the door it starts all over again.

So now I'm stuck. I have the leave the window part way down so that when I close the door it won't index. Does anyone have any ideas on this issue?

 

This is usually a symptom of dirty outside door pads. You can take them off and apart to clean them or get new ones pretty cheap. It should solve your problem.

 

Maybe try disconnecting the batery for a few minutes and then reconect.

 

Thanks, I will check it out.

Would you happen to know what the mechanism of the failure is? Are you talking about the door switch that activates opening the door? If so is it that the switch contacts are dirty or corroded? My door always opens and closes without fail. How does the switch relate the the window cycling after the door closes?

 

Thanks, I will try disconnecting the battery before I try anything else.

 

https://www.corvetteforum.com/forums...post1565563319

Another one:

https://www.corvetteforum.com/forums...ic-window.html

 

That should help the OP

 

Fantastic!
Thanks so much for digging up those posts. One of them talks about this condition happening in areas of high humidity. That sounds like my situation. I live right by the ocean - high humidity and lots of salt.

 

To try to fix the indicated continuous window up/down cycling, I first tried pulling the battery cable to do a reboot. Results were no change, problem still exists.

Second, I pulled the driver side door switch and disassembled it. I have attached two pictures showing the parts. As you can see there is a lot of oxidation on the circuit side. The contractor side looks pretty good.

I then gave the circuit-side part a good cleaning and removed the oxidation and got looking like new. Then reassembled the switch and put it back in operation. The result at first was encouraging. After re-indexing the window it functioned correctly one time. The second time I opened and closed the door it was back to cycling.

Because the switch I disassembled was so oxidized I decided it would be a good idea to replace both with new units and I placed an order today.

In thinking about the function of these switches I am really having a hard time accepting that they would be the cause of the problem I am experiencing. These switches look like simple momentary contact switches. That means that their only function is to activate the door-open function. Once you release the button their job is done and the don't do anything else until you press them again to open the door. In other words, the act of closing the door does not involve the switch - it stays open. Since my problem is initiated by closing to door I would think that the malfunction would have to be located somewhere else. Like maybe the other door switch, the switch that tells the system that the door is closed.

Any thoughts?

 

Well what else happens when you push the pad besides the door opening? Right, the window indexes down! When the door is open the car stops trying to index the windows because it is not needed at that point. It's already indexed down. When the door is closed the index process starts to raise the window back up. With a faulty contact in the switch you get erratic behavior with the widow indexing. It is possible you have something else going on but I'd be surprised if the new switch doesn't fix it. In the mean time you could clean the other one on the passenger side and see what happens.

 

I see what you are saying about more than one thing happening when the button is pressed to open. What I am saying is that the only way for a momentary contact switch to fail is for it either to not contact, or to not open. I know it can't be the first case because the door opens fine. I suppose something funky could happen in the second case where the the switch does not open consistently or if there is some internal current leakage. Stay tuned, we will see what happens when I replace both switches.

Just got shipping info, parts should be arriving Wed the 25th.

 

Here's the text of the bulletin from GM...it specifically references the continuous up/down:


EI08034 — Power Window/Regulator Concerns, Inoperative, Intermittent, Indexing, Continuous Up and Down (Diagnose Door Handle Switch, Replace if Necessary)Models: 2007-2008 Cadillac XLR2007-2008 Chevrolet Corvette ________________________________________ ____________________________________This bulletin is being updated to end the need for diagnostic information and to provide field fix information. Please discard Corporate Bulletin Number 08-08-64-001 (Section 08 — Body and Accessories).___________________________ _____________ ___________________________________Condi tionSome customers may bring their vehicles into the dealership for a concern relating to the operation of their power windows.CorrectionDiagnose the exterior door handle switch as a possible cause for this condition. If diagnosis confirms the condition is caused by the exterior door handle switch, replace both driver and passenger switches. Be sure to mark which switch comes from the driver and passenger doors. Parts will be requested back through the Warranty Parts Center return process.Parts Information Part Number Description10446243 Front Side Door Handle SwitchWarranty InformationFor vehicles repaired under warranty, use: Labor Operation Description Labor TimeN9588* Front Side Door Handle Switch — Replace (Both) 0.9 hr*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.


I have always advocated cleaning the pads rather than replacing them because you can add some corrosion resistant coating to keep it from happening again.

 

In reference to cleaning vs replacement, I noticed in looking up the GM part numbers for these switches that there seems to be newer versions. The name description of the newer part includes words like "Updated" and "SWITCH, Door Electric and Vacuum Locks". These sound like they may be improved versions with better seals to keep out moisture and contaminants.

 

Sorry, can't help you there...where I live corrosion is just not an issue...but the pad can literally be cleaned in 10 minutes so it's worth a try. After cleaning spray a bit of WD-40 on the contacts.

 

I received two new switches and installed them a few days ago. Then took a 900 mile trip which thoroughly tested these new switches. The results were excellent, window indexing/cycling problem has been fixed.

Thanks guys for your help.

 

Thanks for the update, I'll remember this one...