1999 Buick Park Avenue Owner's Manual - Page 306

yellowblue When to Check Check your tires once a month or more. Don't forget your compact spare tire. It should be at 60 psi (420 kPa). 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. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt and moisture. Check Tire Pressure System (If Equipped) The check tire pressure system 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) if pressure in one tire becomes at least 10 psi (69 kPa) lower or higher than the other three tires. The check tire pressure system won't alert you if more than one tire is low or high, or if the system is not calibrated properly. It also won't tell you which tire is low or high. 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" in the Index.) 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" in the Index. 6-48