Jeep commander 2008 Owner's Manual page 344

case, the CHECK TPM SYSTEM message is then fol-
lowed by a graphic display, with pressure values still
shown. This indicates the pressure values are still being
received from the TPM Sensors. However, the system still
needs to be serviced as long as the CHECK TPM
SYSTEM message exists.
NOTE: If your vehicle is equipped with a matching full
size spare wheel and tire assembly, it has a tire pressure
monitoring sensor, and can be monitored by the Tire
Pressure Monitoring System (TPMS). In the event that the
matching full size spare tire is swapped with a low
pressure road tire, the next ignition key cycle will still
show the Tire Pressure Monitoring Telltale Light to be
ON, a chime to sound, a Low Pressure message to appear
in the EVIC, and the graphic display will still show the
low tire pressure value "flashing." Driving the vehicle for
up to 10 minutes above 15 mph (24 km/h), will turn OFF
the Tire Pressure Monitoring Telltale Light as long as
none of road tires are below the low pressure warning
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threshold. The EVIC will also display a "Spare Low
Pressure" text message, and the graphic display will
show a tire pressure value in place of the "flashing" low
tire pressure value.
NOTE: If your vehicle is not equipped with a matching
full size spare wheel and tire assembly, it does not have a
tire pressure monitoring sensor in the spare tire. The
TPMS will not be able to monitor the tire pressure. If you
install the spare tire in place of a road tire that has a
pressure below the low-pressure warning limit, upon the
next ignition key cycle, the Tire Pressure Monitoring
Telltale Light will remain ON, a chime will sound, and
the EVIC will still display a "flashing" pressure value in
the graphic display. After driving the vehicle for up to 10
minutes above 15 mph (24 km/h), the Tire Pressure
Monitoring Telltale Light will flash on and off for 75
seconds and then remain on solid. In addition, the EVIC
will display a CHECK TPM SYSTEM message for three
seconds, and then display dashes (- -) in place of the
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