Pontiac Grand Prix 2007 Owner's Manual page 417

Your vehicle has also been equipped with a TPMS
malfunction indicator to indicate when the system
is not operating properly. The TPMS malfunction
indicator is combined with the low tire pressure
telltale. When the system detects a malfunction,
the telltale will flash for approximately one minute
and then remain continuously illuminated. This
sequence will continue upon subsequent vehicle
start-ups as long as the malfunction exists.
When the malfunction indicator is illuminated, the
system may not be able to detect or signal low
tire pressure as intended. TPMS malfunctions
may occur for a variety of reasons, including the
installation of replacement or alternate tires or
wheels on the vehicle that prevent the TPMS from
functioning properly. Always check the TPMS
malfunction telltale after replacing one or more
tires or wheels on your vehicle to ensure that the
replacement or alternate tires and wheels allow
the TPMS to continue to function properly.
A Tire and Loading Information label, attached to
your vehicle, shows the size of your vehicle's
original equipment tires and the correct inflation
pressure for your vehicle's tires when they
are cold. See Loading Your Vehicle on page 322,
for an example of the Tire and Loading
Information label and its location on your vehicle.
Also see Inflation - Tire Pressure on page 414.
Your vehicle's TPMS system can warn you about a
low tire pressure condition but it does not replace
normal tire maintenance. See Tire Inspection and
Rotation on page 420 and Tires on page 406.
Notice: Do not use a tire sealant if your
vehicle has Tire Pressure Monitors. The liquid
sealant can damage the tire pressure monitor
sensors.
The TPMS will not function properly if one or more
of the TPMS sensors are missing or inoperable. If
the system detects a missing or inoperable sensor,
an error message SERVICE TIRE MONITOR
SYSTEM appears on the DIC display. If you have
replaced a tire/wheel assembly without transferring
the TPMS sensors, the error message displays.
Once you re-install the TPMS sensors, the error
message should go off. See your dealer for service
if all TPMS sensors are installed and the error
message comes on and stays on.
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