Pull out the owners manual. It's in there.

EDIT:

2005 Owners Manual
Section 6-2
LOW TIRE PRESSURE WARNING
SYSTEM
This vehicle is equipped with the low tire pressure
warning system. It monitors tire pressure of
all tires except the spare. When the tire pressure
monitoring system warning light is lit, one or more
of your tires is significantly under-inflated. If
equipped, the system also displays pressure of
all tires (except the spare tire) on the display
screen by sending a signal from a sensor that is
installed in each wheel. If the vehicle is being
driven with low tire pressure (lower than 28 psi,
193 kPa), the low tire pressure warning system
will activate and warn you of it by the low tire
pressure warning light. This system will activate
only when the vehicle is driven at speeds above
20 MPH (32 km/h). For more details, refer to
“Warning/indicator lights and audible reminders”
in the “Instruments and controls” section, “Tire
pressure information” in the “Display screen,
heater, air conditioner and audio systems” section
and “Low tire pressure warning system” in
the “Starting and driving” section.