2004 Cadillac DeVille Owner's Manual - Page 349

When to Check Check your tires once a month or more. Do not forget your compact spare tire. It should be at 60 psi (420 kPa). Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture. Your vehicle has a Tire Pressure Monitor (TPM) that sends tire pressure information to the Driver Information Center (DIC). Using the DIC control buttons, the driver is able to check tire pressure levels in all four road tires. See Tire Pressure Monitor Operation on page 5-69 and DIC Controls and Displays on page 3-60 for additional information. How to Check Use a good quality pocket-type gage to check tire pressure. You can't tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they're underinflated. Check tire inflation pressure when the tire is cold. Cold means your vehicle has been sitting for at least three hours or driven no more than 1 mile (1.6 km). Remove the valve cap from the tire valve stem. Press the tire gage firmly onto the valve to get a pressure measurement. If the cold tire inflation pressure matches the recommended pressure on the Tire and Loading Information label, no further adjustment is necessary. If the inflation pressure is low, add air until you reach the recommended amount. If you overfill the tire, release air by pushing on the metal stem in the center of the tire valve. Recheck the tire pressure with the tire gage. Tire Pressure Monitor Operation The Tire Pressure Monitor (TPM) system uses radio and sensor technology to check tire pressure levels. Sensors, mounted on each road wheel, transmit tire pressure readings to a receiver located in the trunk. Tire pressure status and tire pressure warnings are shown on the Driver Information Center (DIC) display. See Driver Information Center (DIC) on page 3-59, for details regarding DIC controls and displays. The system operates on a radio frequency subject to Federal Communications Commission (FCC) Rules and with Industry and Science Canada. 5-69