1999 PONTIAC GRAND AM tire pressure reset

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2-56 Check Tire Pressure Light (If Equipped)
The tire pressure monitor system can alert you to a large
change in the pressure in one tire. After the system has
ªlearnedº tire pressures with properly inflated tires, the
CHECK TIRE PRESSURE light will come on if the
pressure in one tire becomes 12 psi (83 kPa) lower than
the other three tires. The tire pressure monitor system
won't alert you if the pressure in more than one tire is
low, if the system is not yet calibrated, or if the vehicle
is moving at less than 15 mph (25 km/h), faster than
75 mph (120 km/h), on rough roads or during turns.
The light may also come on if you are driving on
partially cleared pavement.When the CHECK TIRE PRESSURE light comes on,
you should stop as soon as you can and check all your
tires for damage. (If a tire is flat, see ªIf a Tire Goes
Flatº in the Index.) Also check the tire pressure in all
four tires as soon as you can. See ªInflation
- Tire
Pressureº in the Index.
The light will stay on until you turn off the ignition or
reset the system. See ªTire Pressure Monitor Systemº in
the Index.
The CHECK TIRE PRESSURE light also comes on
briefly when you turn the ignition key to ON. If the light
doesn't come on then, have it fixed so it will be there to
tell you if the pressure in a tire is low or high.
If the anti
-lock brake system warning light comes on,
the tire pressure monitor system may not be working.
See your dealer for service. (Also, see ªAnti
-Lock
Brake System Warning Lightº in the Index).

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After the system has learned tire pressures with properly
inflated tires, the CHECK TIRE PRESSURE light will
come on if the pressure in one tire becomes 12 psi
(83 kPa) lower than the other three tires. The tire pressure
monitor system won't alert you if the pressure in more
than one tire is low, if the system is not properly
calibrated, or if the vehicle is moving at less than 15 mph
(25 km/h), faster than 75 mph (120 km/h), on rough
roads or during turns. The light may also come on if you
are driving on partially cleared pavement.
The tire pressure monitor 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 ªTiresº in the Index.
If the anti
-lock brake system warning light comes on,
the tire pressure monitor system may not be working.
See your dealer for service. (Also, see ªAnti
-Lock
Brake System Warning Lightº in the Index).When the CHECK TIRE PRESSURE light comes on,
you should stop as soon as you can and check all your
tires for damage. (If a tire is flat, see ªIf a Tire Goes
Flatº in the Index.) Also check the tire pressure in all
four tires as soon as you can. See ªInflation
- Tire
Pressureº in the Index.
The light will come on and stay on until you turn off the
ignition or press the RESET button.
Don't reset the tire pressure monitor 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 system
will not work properly and may not alert you when
a tire is low.

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Any time you adjust a tire's pressure, rotate your tires, or
have one or more tires repaired or replaced, you'll need to
reset (calibrate) the tire pressure monitor system. You'll
also need to reset the system whenever you buy new tires
and whenever the vehicle's battery has been disconnected.
To reset (calibrate) the system: turn the ignition switch
to ON (engine not running). The RESET button is
located inside of the driver's side instrument fuse panel.
Press and release the RESET button. The CHANGE
OIL light will begin to flash. Press and release the
RESET button again. The CHANGE OIL light will go
off, and the CHECK TIRE PRESSURE light will start
flashing. When the CHECK TIRE PRESSURE light is
flashing, press and hold the RESET button until the
chime sounds. If the CHECK TIRE PRESSURE light
doesn't go off then, see your dealer for service.
The system completes the calibration process
during driving.The system normally takes 15 to 20 minutes of driving
in each of three speed ranges to ªlearnº tire pressures.
The speed ranges are 15 to 40 mph (25 to 65 km/h),
40 to 65 mph (65 to 105 km/h) and above 65 mph
(105 km/h). When learning is complete, the system will
alert you after 2
-8 minutes if a tire is 12 psi (83 kPa)
different from the other three tires. Detection thresholds
may be higher and detection times may be longer on
rough roads, curves and at high speeds. The system
is not capable of detection at speeds greater than
75 mph (120 km/h).
Tire Inspection and Rotation
Tires should be rotated every 6,000 to 8,000 miles
(10 000 to 13 000 km). Any time you notice unusual
wear, rotate your tires as soon as possible and check
wheel alignment. Also check for damaged tires or
wheels. See ªWhen It's Time for New Tiresº and
ªWheel Replacementº later in this section for
more information.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The first
rotation is the most important. See ªScheduled
Maintenance Servicesº in the Index for scheduled
rotation intervals.