EI08034 - Power Window/Regulator Concerns, Inoperative, Intermittent, Indexing, Continuous Up and Down (Engineering Information)

Important: If the initial customer concern does not involve window regulator functions, but diagnosis leads to the window regulator, the technician should continue to follow the procedures in this bulletin.

Some customers may bring their vehicles into the dealership for a concern relating to the operation of their power windows.

GM Engineering is trying to understand the concerns related to power windows on Corvette and XLR. Engineering has a need to gather information during diagnosis and BEFORE any repairs are made.

Complete the following steps, noting all information on the repair order.

1. Describe (in detail) the customer's concern and under what conditions it occurs.
2. Has the vehicle experienced a low or dead battery in the past 30 days?
3. Is the vehicle currently exhibiting the condition?
4. Can the condition be repeated or is it intermittent?
5. Using J 42000 or J 42000EU, record the battery voltage and test code produced by the battery tester.
6. Using the Tech 2®, scan for and list all DTCs. Note if they are current or stored in history.
7. The window regulator module is responsible for the windows, power locks (in conjunction with the BCM and RCDLR), puddle lights and mirrors.

Verify the operation of the following modules and/or components to see what is and isn't working:

-	Power Locks: Confirm the BCM and RCDLR are sending Class 2 messages to the window regulator module to lock and unlock the door and release the power door latch.

-

BCM

-	Remote door lock and keyless entry

-	OSRV Mirrors

8. Verify the following functions are operating correctly:

-	Window switches -- if no, refer to Power Windows Malfunction in SI for trouble shooting process.

-	Door lock/unlock controls -- if no, refer to Power Door Locks Description and Operation in SI for trouble shooting process.

-	Door release button -- if no, refer to Power Door Latch Description and Operation in SI for trouble shooting process.

9. For Indexing concerns:

9.1.	Reinitialize the window with the DOOR CLOSED -- refer to Power Window Reinitialization in SI.

9.2.	Remove exterior door handle switch and inspect for damage or evidence of water intrusion and replace if necessary.

9.3.	Did this correct the customer's concern?

•	Yes -- No further repairs are required, go to Step 14.

•	No -- go to Step 10.

10. Using the Tech 2® (monitor door ajar signals), confirm whether the door is opened or closed. Refer to Power Door Latch Description and Operation in SI for explanation of function and trouble shooting process.
11. Inspect the door latch contact switch for proper operation and the door latch for internal parts sticking or intermittent operation. If necessary, replace switch. Did this correct the customer's concern?

•	Yes -- No further repairs are required, go to Step 14.

•	No -- go to Step 12.

12. Remove the interior door panel on the complaint side of the vehicle. Disconnect and reconnect the connector at the regulator three (3) times to remove any oxidation or fretting corrosion from the terminals. Remove the connector and apply a light coating of dielectric grease to the terminal end and connector. Reconnect the electrical connector. Did this correct the customer's concern?

•	Yes -- No further repairs are required, go to Step 14.

•	No -- go to Step 13.

13. Replace the window regulator and confirm the repair has corrected the customer's concern. Proceed to Step 14.
14. Contact engineering -- Jim David at 248-684-3034 or Robert Montgomery at 248-339-4884 to provide diagnostic and repair information. If Jim or Robert are unavailable, please fax the front and back of the completed repair order to Jim's attention at 248-685-6140.

Use the following labor operation. Apply the appropriate add time based on what corrected the customer's concern.