2003 Pontiac Aztek Owner's Manual - Page 352

Check Tire Pressure System Your vehicle may have a check tire pressure system that can alert you to a large change in the pressure of one tire. The system won't alert you before you drive that a tire is low or flat. You must begin driving before the system will work properly. The TIRE PRESSURE LOW: CHECK TIRES message will appear on the Driver Information Center (DIC) and the LOW TIRE PRESSURE message will come on the message center if pressure difference (low pressure) is detected in one tire. In the following conditions, the LOW TIRE PRESSURE may not come on even if the tire pressure is low, or it may come on when the tire pressure is actually normal if: more than one tire is low, only one tire is replaced with a new tire during service, - the vehicle is moving faster than 70 mph (113 km/h), iire sysierrr is rwi yei caiiuraied, If the anti-lock brake system warning light comes on, the check tire pressure system may not be working properly. See your dealer for service. Also, see Anti-Lock Brake System Warning Light on page 3-35. The check tire pressure system detects differences in tire rotation speeds that are caused by changes in tire pressure. The system can alert you about a low tire - but it doesn't replace normal tire maintenance. See Tires on page 5-55. When the TIRE PRESSURE LOW: CHECK TIRES message appears on the Driver Information Center and the LOW TIRE PRESSURE message comes on the message center, you should stop as soon as you can and check all your tires for damage. If a tire is flat, see If a Tire Goes Flat on page 5-67. Also check the tire pressure in all four tires as soon as you can. See Inflation -- Tire Pressure on page 5-56. Any time you adjust a tire's pressure or have one or more tires repaired or replaced, you'll need to reset (calibrate) the check tire pressure system. You'll also need to reset the system whenever you rotate the tires, buy new tires dl IU II 1 3 L d l l VI I t:l I I U V t : L I It: LUI I IPJdLL 3Pdl t . : .-1 _ I _ II . - 11- -1 the tire treadwear is uneven, the compact spare tire is installed, tire chains are being used, or the vehicle is being driven on a rough or frozen road. Don't reset the check tire pressure system without first correcting the cause of the problem and checking and adjusting the pressure in all four tires. If you reset the system when the tire pressures are incorrect, the check tire pressure system will not work properly and may not a-lert you when a tire is low or high.. 5-57