Pontiac Aztek 2003 Owner's Manual page 332

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),
•
the system is not yet calibrated,
•
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.
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 3-34 .
5-52
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 5-50 .
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 5-61 . Also check the
tire pressure in all four tires as soon as you can.
See Inflation -- Tire Pressure on page 5-50 .
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
and install or remove the compact spare.
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 alert you when a tire is low or high.