2007 GMC Acadia Owner's Manual - Page 444

Tire Pressure Monitor System The Tire Pressure Monitor System (TPMS) uses radio and sensor technology to check tire pressure levels. TPMS sensors are mounted onto each tire and wheel assembly, except the spare tire. TPMS sensors monitor the air pressure in your vehicle's tires and transmit tire pressure readings to a receiver located in the vehicle. The TPMS is designed to alert the driver, if a low tire pressure condition exists. If your vehicle has the Driver Information Center (DIC), the driver can also check tire pressure levels using the DIC. When a low tire pressure condition is detected, the TPMS illuminates the low tire pressure warning symbol located on the instrument panel cluster. If your vehicle has the DIC feature, a message to check the pressure in a specific tire also appears on the DIC display. The low tire pressure warning symbol on the instrument panel cluster and the CHECK TIRE PRESSURE warning message on the DIC display appears at each ignition cycle until the tires are inflated to the correct inflation pressure. For additional information and details about the DIC operation and displays see DIC Operation and Displays (With DIC Buttons) on page 233 or DIC Operation and Displays (Without DIC Buttons) on page 239 and DIC Warnings and Messages on page 244. You may notice, during cooler weather conditions, the tire pressure monitor light, located on the instrument panel cluster, and the CHECK TIRE PRESSURE message appears when the vehicle is first started and then turn off as you start to drive the vehicle. This could be an early indicator that the tire pressures are getting low and need to be inflated to the proper pressure. Each tire, including the spare (if provided), should be checked monthly when cold and inflated to the inflation pressure recommended by the vehicle manufacturer on the vehicle placard or tire inflation pressure label. (If your vehicle has tires of a different size than the size indicated on the vehicle placard or tire inflation pressure label, you should determine the proper tire inflation pressure for those tires.) 444