2002 Chevrolet Impala



September, 27, 2010 AT 7:11 AM

Computer problem
2002 Chevy Impala

Went to Autozone, got a new BCM, programmed to my vin, installed it. The car stereo and security system still locked up. Other items controlled by BCM are working. What can I do myself? Or do I have to go to dealership?

4 Answers



September, 27, 2010 AT 7:16 AM

Who was supposed to have programmed this because I don't believe AutoZone has the capability to do that.



September, 27, 2010 AT 7:22 AM

During body control module (BCM) related service, the procedures below are designated to set-up the BCM correctly. Before you start, read these procedures carefully and completely.


IMPORTANT: The BCM will not function properly if the Setup New BCM procedure is not performed.
Make sure the battery is fully charged before performing the setup procedure.
Make sure all disconnected devices and connectors have been reconnected
Perform the Theft Deterrent Re-learn procedure after successfully finishing the Setup New BCM procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent. If the Theft Deterrent Re-learn procedure is not performed after a BCM replacement, the following conditions may occur: The vehicle will not be protected against theft by the PASSLOCK system.
The engine will not crank nor start.
Connect a scan tool to the data link connector (DLC).
Turn the ignition switch ON.
Select Diagnostics and input all of the required data when prompted by the scan tool.
Select Setup New BCM.
Note, Input all of the required data when prompted by the scan tool.
Select Setup SDM Part Number in BCM, and follow the onscreen directions.
Select New VIN, and follow the onscreen directions.
Select Option Configuration, and follow the onscreen directions.
Select Point of Sale, and follow the onscreen directions.
Exit back to the SPECIAL FUNCTIONS menu.
When the BCM, VIN, Point of Sale and Option Configuration have been entered, proceed with Theft Deterrent Re-learn procedure.
If the scan tool displays UNABLE TO PROGRAM BCM, BCM IS SECURED, then the BCM must be replaced and this procedure must be repeated on a new BCM.
NOTE: After the above procedure has been completed, personalization of the BCM defaults to a default setting. Inform the customer that the personalization settings must be set again.

IMPORTANT: After programing, perform the following to avoid future misdiagnosis: Turn the ignition OFF for 10 seconds.
Connect the scan tool to the data link connector.
Turn the ignition ON with the engine OFF.
Use the scan tool in order to retrieve History DTCs from all modules.
Clear all history DTCs

Turn ON the ignition, with the engine OFF.
Attempt to start the engine, then release the key to ON (vehicle will not start).
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the PASSLOCK Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).
IMPORTANT: The vehicle learns the PASSLOCK Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

Start the engine (the vehicle has now learned the PASSLOCK Sensor Data Code and/or password).
With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).

First of all thank you so much for your donation.I posted how to set up the new bcm and how to relearn the pass lock sensor after replacing the bcm. Give that a try. If the set up wasn't done with a tech2 with the correct software the new bcm won't work correctly.



September, 28, 2010 AT 7:00 AM

Thanks for the detailed directions, will be working on it. On another site when I was researching this problem, someone mentioned they got the part at Autozone and it comes programmed for his specific VIN. I thought this was great, but in talking to the Autozone sales, it wasn't really programmed. Back to basics. Thanks again for your help!



September, 28, 2010 AT 7:05 AM

I didn't think it could be. You need the dealer for that.

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