I didn't know you replaced the BCM.
You need a Tech 2 for that repair, too:
Service Information
2002 Pontiac Aztek - AWD | Aztek, Rendezvous VIN A/B Service Manual | Document ID: 1981881
Body Control Module BCM Programming/RPO Configuration
Introduction
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.
Setup New Body Control Module (BCM)
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
• Make sure that the VIN that is stored in the new BCM matches the vehicle.
• 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
1. Turn the ignition switch ON leaving the engine Off.
2. Navigate to the Special Functions menu in the Body Control Module menu on the Scan Tool, then enter Setup New BCM, perform the following setup procedures in the order they are listed:
• Setup SDM Part Number in BCM
• New VIN
• Option Configuration
• Point of Sale
3. After all of the previous procedures are complete proceed with the Theft Deterrent Re-learn procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent.
4. 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 the factory settings. Inform the customer that the personalization settings must be set again.
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