ECM To TDM Link Procedure

WARNING: This page is about a different car, the 2011 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

This procedure will relearn the prerelease password and the challenge/response data between the theft deterrent module (TDM) and the engine control module (ECM).

Connect a scan tool to the vehicle in the pass-thru arrangement.
Ensure that all power consuming devices are turned OFF on the vehicle.
On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions, using the Pass-Thru method. Ensure the correct programming selection is chosen based on component being replaced or programmed. For this procedure, go to the VTD Vehicle Theft Deterrent Learn (Relearn & Link) menu and choose the ECM to VTD Link Procedure selection.
At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.
Observe the scan tool. After approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition".
Turn OFF the ignition and wait 2 minutes.
With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle.
With a scan tool, clear any DTCs.