Set Up a Theft Deterrent Module (TDM) Using Existing Keys

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

Use this procedure only if replacing the theft deterrent module (TDM) using the existing vehicle keys.
Because of how vehicle key information and theft deterrent passwords are stored within the TDM, the Set Up a New Theft Deterrent Module procedure must be performed prior to the removal and replacement of the TDM if the vehicle keys are being reused. Performing the setup procedure first allows the scan tool to extract the key information and passwords from the old TDM prior to its removal. Failure to perform this step will result in the failure to learn the existing vehicle keys and new vehicle keys will be required when replacing the TDM.
Do not use the scan tool for any other programming operations while performing this procedure. Doing so will erase the stored data retrieved from the original TDM and cause the set-up to fail.

Perform the 10-Minute Relearn Procedure using the Prepare Module For TDM Setup Procedure calibration. Refer to the 10-Minute Relearn Procedure below.
Connect a scan tool to the vehicle.
Turn ON the ignition, with the engine OFF.
With a scan tool, select TDM in the Vehicle Control Systems Module Replacement/Setup data list.
Select Step 1.
Select Use Existing Keys.
Follow the scan tool on-screen instructions. The scan tool will then display Replace Module Per Service Manual. At this time, replace the theft deterrent module (TDM). Refer to.
After the new TDM has been installed, using the scan tool, select Step 2 and follow the on-screen instructions.