Tire Pressure Monitor
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The instrument panel cluster (IPC) receives a GMLAN message from the tire pressure monitoring (TPM) system for front and rear tire pressure data. The driver information center (DIC) will display the pressure for each of the front and rear tires. Tire pressure values are not resettable through the DIC.