2008 Cadillac STS Owner's Manual - Page 391

The TPM matching process is outlined below: 1. Set the parking brake. 2. Press the push-button ignition switch to Acc. 3. Using the keyless access transmitter, lock and unlock the vehicle's doors. 4. Press the lock and unlock buttons, at the same time, on the keyless access transmitter. A single horn chirp will sound, indicating that the TPMS is ready, and the sensor matching process can begin. 5. Start with the driver side front tire. 6. Remove the valve cap from the valve stem. Activate the TPMS sensor by increasing or decreasing the tire's air pressure for five seconds, or until a horn chirp sounds. The horn chirp, which may take up to 30 seconds to sound, confirms that the sensor identification code has been matched to this tire position. 7. Proceed to the passenger side front tire, and repeat the procedure in Step 6. 8. Proceed to the passenger side rear tire, and repeat the procedure in Step 6. 9. Proceed to the driver side rear tire, and repeat the procedure in Step 6. 10. After hearing the confirming single horn chirp for the driver side rear tire, a double horn chirp will sound to signal the tire matching mode is no longer active. Press the push-button ignition switch to Acc. 11. Set all four tires to the recommended air pressure level as indicated on the tire and loading information label. 12. Put the valve caps back on the valve stems. Tire Inspection and Rotation We recommend that you regularly inspect your vehicle's tires, including the spare tire, for signs of wear or damage. See When It Is Time for New Tires on page 5-75 for more information. Tire rotation is not recommended if your vehicle has the following performance tire combinations: • P235/50R17 size tires on the front wheels and P255/45R17 size tires on the rear wheels. • P235/50ZR18 size tires on the front wheels and P255/45ZR18 size tires on the rear wheels. • P255/45R18 size tires on the front wheels and P275/40R19 size tires on the rear wheels. 5-73