When To Check; Tire Pressure Monitor Operation - Cadillac 2004 DeVille Owner's Manual

When to Check

Check your tires once a month or more.
Do not 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.
Check tire inflation pressure when the tire is cold.
Cold means your vehicle has been sitting for at least
three hours or driven no more than 1 mile (1.6 km).
Remove the valve cap from the tire valve stem.
Press the tire gage firmly onto the valve to get a
pressure measurement. If the cold tire inflation pressure
matches the recommended pressure on the Tire and
Loading Information label, no further adjustment is
necessary. If the inflation pressure is low, add air until
you reach the recommended amount.
If you overfill the tire, release air by pushing on the
metal stem in the center of the tire valve. Recheck the
tire pressure with the tire gage.
Be sure to put the valve caps back on the valve stems.
They help prevent leaks by keeping out dirt and moisture.
Your vehicle has a Tire Pressure Monitor (TPM) that
sends tire pressure information to the Driver Information
Center (DIC). Using the DIC control buttons, the driver is
able to check tire pressure levels in all four road tires.
See Tire Pressure Monitor Operation on page 5-69 and
DIC Controls and Displays on page 3-60 for additional
information.

Tire Pressure Monitor Operation

The Tire Pressure Monitor (TPM) system uses radio
and sensor technology to check tire pressure levels.
Sensors, mounted on each road wheel, transmit
tire pressure readings to a receiver located in the trunk.
Tire pressure status and tire pressure warnings are
shown on the Driver Information Center (DIC) display.
See Driver Information Center (DIC) on page 3-59,
for details regarding DIC controls and displays.
The system operates on a radio frequency subject to
Federal Communications Commission (FCC) Rules and
with Industry and Science Canada.
5-69