Using the Scan Tool

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Set all tire pressures to the manufacturers specification.
Install the scan tool.
Turn ON the ignition, with the engine OFF.
With the scan tool select SPECIAL FUNCTIONS.
Select TIM RESET.
Press the RESET soft key.
Use the scan tool in order to clear the TPM DTC.