2007 Cadillac CTS Owner's Manual - Page 408

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, confirms that the sensor identification code has been matched to this tire position. To decrease the tire's air-pressure use the pointed end of the valve cap, a pencil-style air pressure gage, or a key. 7. Proceed to the passenger's side front tire, and repeat the procedure in Step 6. 8. Proceed to the passenger's side rear tire, and repeat the procedure in Step 6. 9. Proceed to the driver's side rear tire, and repeat the procedure in Step 6. 10. After hearing the confirming double horn chirp, for the left rear tire, exit the matching process by turning the ignition switch to OFF. 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. The TPMS will not function properly, if one or more of the TPMS sensors are missing or inoperable. If your vehicle has a compact spare tire, the spare tire and wheel assembly does not contain a TPMS sensor. If you replace one of the road tires with the spare, or if the system detects a missing or inoperable sensor, the Service Tire Monitor System message will be displayed on the DIC. If you have replaced a tire and wheel assembly without transferring the TPMS sensors, the error message will be displayed. Once you re-install the TPMS sensors, the message should go off. See your GM dealer for service if all TPMS sensors are installed and the error message comes on and stays on. Have your vehicle serviced as soon as possible. If your vehicle has a message center and the system detects a missing or inoperable sensor an error message of several dashes will be shown on the message center display. If you have replaced a tire and wheel assembly without transferring the TPMS sensors, the error message will be displayed. Once you re-install the TPMS sensors, the error message should go off. See your GM dealer for service if all TPMS sensors are installed and the error message comes on and stays on. 408