Occupant Restraint Systems; Occupant Restraint Systems Features - Jeep Grand Cherokee SRT 2018 Owner's Manual

played 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 TPM sensors.
• Installing some form of aftermarket window
tinting that affects radio wave signals.
• Lots of snow or ice around the wheels or
wheel housings.
• Using tire chains on the vehicle.
• Using wheels/tires not equipped with TPM
sensors.
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
instrument cluster display will still display a pres-
sure 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 Telltale Light will flash on and off for
75 seconds and then remain on solid. In addition,
the instrument cluster display will display a "SER-
VICE 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 Pres-
104
sure Monitoring Telltale Light will flash on and off
for 75 seconds and then remain on solid, and the
instrument cluster display will display a "SER-
VICE 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 Telltale
Light will turn off and the graphic in the instru-
ment 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 TPMS can be deactivated if 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
(TPM) Sensors. Then, drive the vehicle for
20 minutes above 15 mph (24 km/h). The TPMS
will chime, the "TPM Telltale 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.
Beginning with the next ignition cycle, the TPMS
will no longer chime or display the "SERVICE
TPM SYSTEM" message in the instrument clus-
ter but dashes (--) will remain in place of the
pressure values.
To reactivate the TPMS, replace all four wheel
and tire assemblies (road tires) with tires
equipped with TPM sensors. Then, drive the
vehicle for up to 20 minutes above 15 mph
(24 km/h). The TPMS will chime, the "TPM
Telltale Light" will flash on and off for 75 seconds
and then turn off. The instrument cluster will
display the "SERVICE TPM SYSTEM" message
and then display pressure values in place of the
dashes. On the next ignition cycle the "SER-
VICE TPM SYSTEM" message will no longer be
displayed as long as no system fault exists.
OCCUPANT RESTRAINT
SYSTEMS
Some of the most important safety features in
your vehicle are the restraint systems:

Occupant Restraint Systems

Features
• Seat Belt Systems
• Supplemental Restraint Systems (SRS)
Air Bags
• Supplemental Active Head Restraints
• Child Restraints