Jeep Grand Cherokee 2013 Operating Information Manual page 275

If the ignition switch is cycled, this sequence will
repeat, providing the system fault still exists. If
the system fault no longer exists, the Tire Pres-
sure Monitoring Telltale Light will no longer
flash, the "SERVICE TPM SYSTEM" message
will not be present, and a pressure value will be
displayed instead of dashes. A system fault can
occur by any of the following:
1. Jamming due to electronic devices or driving
next to facilities emitting the same Radio Fre-
quencies as the TPM sensors.
2. Installing some form of aftermarket window
tinting that affects radio wave signals.
3. Lots of snow or ice around the wheels or
wheel housings.
4. Using tire chains on the vehicle.
5. Using wheels/tires not equipped with TPM
sensors.
The EVIC will also display a "SERVICE TPM
SYSTEM" message for a minimum of five sec-
onds when a system fault is detected possibly
related to an incorrect sensor location fault. In
this case, the "SERVICE TPM SYSTEM" mes-
sage is then followed by a graphic display, with
pressure values still shown. This indicates the
pressure values are still being received from the
TPM Sensors but they may not be located in the
correct vehicle position. However, the system
still needs to be serviced as long as the "SER-
VICE TPM SYSTEM" message exists.
NOTE:
There is no 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 switch 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 and an Inflate to
XXX kPa message will be displayed. After
driving the vehicle for up to 20 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 "SERVICE
TPM SYSTEM message for five seconds
and then display dashes (- -) in place of the
pressure value. For each subsequent igni-
tion switch cycle, a chime will sound, the
Tire Pressure Monitoring Telltale Light will
flash on and off for 75 seconds and then
remain on solid, and the EVIC will display a
SERVICE TPM SYSTEM message for five
seconds and then display dashes (- -) in
place of the pressure value. Once you repair
or replace the original road tire, and reinstall
it on the vehicle in place of the spare tire, the
TPMS will update automatically.
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