SAFETY
239
Service TPMS Warning
The Tire Pressure Monitoring System Warning Light
will flash on and off for 75 seconds, and remain on
solid when a system fault is detected. The system
fault will also sound a chime. The instrument
cluster display will display a “SERVICE TPM
SYSTEM” message for a minimum of five seconds.
This message is then followed by a graphic display,
with “--“ in place of the pressure value(s),
indicating which Tire Pressure Monitoring System
sensor(s) is not being received.
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 Pressure
Monitoring System Warning 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:
Jamming due to electronic devices or driving
next to facilities emitting the same Radio
Frequencies as the TPMS sensors.
Lots of snow or ice around the wheels or wheel
housings.
Using tire chains on the vehicle.
Using wheels/tires not equipped with TPMS
sensors.
NOTE:
Only vehicles equipped with a full size matching
spare (i.e., matching with a road wheel) come with
a Tire Pressure Monitoring System (TPMS) sensor
mounted in the spare tire. In either option of having
a full size spare equipped or not, the tire pressure
is not monitored or displayed on the cluster for the
corresponding spare tire location. 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 Moni
-
toring System Warning Light will remain on, a
chime will sound, and the instrument cluster
display will still display a pressure value in the
different color graphic display and an “Inflate to
XX” message will be displayed. After driving the
vehicle for up to 20 minutes above 15 mph
(24 km/h), the Tire Pressure Monitoring System
Warning Light will flash on and off for 75 seconds
and then remain on solid. In addition, the
instrument cluster display will display a “SERVICE
TPM SYSTEM" message for five seconds and then
display dashes (--) in place of the pressure value.
For each subsequent ignition switch cycle, a chime
will sound, the Tire Pressure Monitoring System
Warning Light will flash on and off for 75 seconds
and then remain on solid, and the instrument
cluster display 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.
In addition, the Tire Pressure Monitoring System
Warning Light will turn off and the graphic in the
instrument cluster display will display a new
pressure value instead of dashes (--), as long as no
tire pressure is below the low-pressure warning
limit in any of the four active road tires. The vehicle
may need to be driven for up to 20 minutes above
15 mph (24 km/h) in order for the TPMS to receive
this information.
TPMS Deactivation — If Equipped
The Tire Pressure Monitoring System (TPMS) can
be deactivated by replacing all four wheel and tire
assemblies (road tires) with wheel and tire
assemblies that do not have TPMS sensors, such
as when installing winter wheel and tire
assemblies on your vehicle.
To deactivate the TPMS, first, replace all four wheel
and tire assemblies (road tires) with tires not
equipped with Tire Pressure Monitoring System
sensors. Then, drive the vehicle for 20 minutes
above 15 mph (24 km/h). The TPMS will chime,
the TPMS Warning Light will flash on and off for
75 seconds and then remain on. The instrument
cluster will display the “SERVICE TPM SYSTEM”
message and then display dashes (--) in place of
the pressure values.
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21_WL_OM_EN_USC_t.book Page 239
Summary of Contents for GRAND CHEROKEE L 2021
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