Tire Pressure Monitor System (Tpms) - Jeep Grand Cherokee SRT 2019 Owner's Manual

• FCW may not react to irrelevant objects such
as overhead objects, ground reflections, ob-
jects not in the path of the vehicle, stationary
objects that are far away, oncoming traffic, or
leading vehicles with the same or higher rate
of speed.
• FCW will be disabled like ACC, with the
unavailable screens.
FCW Limited Warning
If the instrument cluster displays "ACC/FCW
Limited Functionality" or "ACC/FCW Limited
Functionality Clean Front Windshield" momen-
tarily, there may be a condition that limits FCW
functionality. Although the vehicle is still drivable
under normal conditions, the active braking may
not be fully available. Once the condition that
limited the system performance is no longer
present, the system will return to its full perfor-
mance state. If the problem persists, see your
authorized dealer.
Service FCW Warning
If the system turns off, and the instrument
cluster displays:
• ACC/FCW Unavailable Service Required
• Cruise/FCW Unavailable Service Required
This indicates there is an internal system fault.
Although the vehicle is still drivable under nor-
mal conditions, have the system checked by an
authorized dealer.
Tire Pressure Monitor System
(TPMS)
NOTE:
For vehicles equipped with run flat tires — when
the TPMS indicates a tire pressure of 14 psi
(96 kPa) or lower, always check tire pressure
and replace the tire at the first opportunity. At
inflation pressure of/or below 14 psi (96 kPa) the
tire is in the run-flat mode of operation. In this
condition, it is recommended a vehicle maxi-
mum speed of 50 mph (80 km/h) for a maximum
distance of 50 miles (80 km). The manufacturer
does not recommend using the run flat feature
while driving a vehicle loaded at full capacity or
towing a trailer.
The Tire Pressure Monitoring System (TPMS)
will warn the driver of a low tire pressure based
on the vehicle recommended cold tire pressure.
The tire pressure will vary with temperature by
about 1 psi (7 kPa) for every 12°F (6.5°C). This
means that when the outside temperature de-
creases, the tire pressure will decrease. Tire
pressure should always be set based on cold
inflation tire pressure. This is defined as the tire
pressure after the vehicle has not been driven
for at least three hours, or driven less than
1 mile (1.6 km) after a three-hour period. Refer
to "Tires" in "Servicing And Maintenance"
for information on how to properly inflate the
vehicle's tires. The tire pressure will also in-
crease as the vehicle is driven - this is normal
and there should be no adjustment for this
increased pressure.
The TPMS will warn the driver of a low tire
pressure if the tire pressure falls below the low
pressure warning threshold for any reason, in-
cluding low temperature effects, or natural pres-
sure loss through the tire.
The TPMS will continue to warn the driver of low
tire pressure as long as the condition exists, and
will not turn off until the tire pressure is at or
above recommended cold tire pressure. Once
the low tire pressure warning has been illumi-
nated, the tire pressure must be increased to the
recommended cold tire pressure in order for the
TPMS Warning Light to be turned off.
NOTE:
When filling warm tires, the tire pressure may
need to be increased up to an additional 4 psi
(28 kPa) above the recommended cold placard
pressure in order to turn the TPMS Warning
Light off.
The system will automatically update and the
TPMS Warning Light will extinguish once the
updated tire pressures have been received. The
vehicle may need to be driven for up to 20 min-
utes above 15 mph (24 km/h) to receive this
information.
For example, your vehicle has a recommended
cold (parked for more than three hours) tire
pressure of 33 psi (227 kPa). If the ambient
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