Powertrain Control Module (PCM)
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The PCM verifies that the password received from the theft deterrent control module via the Class 2 serial data circuit is correct. The PCM can learn only one enable password. If the enable password is correct, the PCM enables the starting and fuel delivery systems.
The PCM disables the starting and fuel delivery systems if any of the following conditions occur:
- The enable password is incorrect.
- The system disable password is sent by the theft deterrent control module.
- No passwords are received - there is no communication with the theft deterrent control module.