Oldsmobile 1999 Alero - Manual (Page 121)

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Low 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
“learned” tire pressures with properly inflated tires, the
LOW 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 LOW 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 “If a Tire Goes Flat” in
the Index.) Also check the tire pressure in all four tires
as soon as you can. See “Inflation
- Tire Pressure” in
the Index.
The light will stay on until you turn off the ignition or
reset the system. See “Tire Pressure Monitor System” in
the Index.
The LOW 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 “Anti
- Lock
Brake System Warning Light” in the Index).