light JEEP WRANGLER 2021 Owner handbook (in English)

40 mph (64 km/h). For speeds at or exceed-
ing approximately 40 mph (64 km/h) the ESC
goes into "ESC Partial Off" When the vehicle
speed drops below 35 mph (56 km/h), the
ESC system goes back to "ESC Full Off". The
ESC is in "ESC Full Off" at low vehicle speeds
in 4L range so that it will not interfere with
off-road driving, but the ESC function returns
to provide the stability feature at speeds
above 40 mph (64 km/h). The “ESC OFF
Indicator Light” will always be illuminated in
4L range when ESC is in "ESC Full Off" or
"ESC Partial Off".
NOTE:
The “ESC OFF” message will display and an
audible chime will sound when the gear se-
lector is placed in the PARK position from
any other position, and then moved out of the
PARK position. This will occur even if the
message was previously cleared.
WARNING!
With the ESC in "ESC Full Off" mode, the
engine torque reduction and stability fea-
tures offered by ESC and ERM are dis-
WARNING!
abled. In an emergency evasive maneuver,
the ESC and ERM systems will not engage
to assist in maintaining stability. The "ESC
Full Off" mode is intended for off-road use
only.
2H Range (4WD Models) Or 2WD Models
ESC On
This is the normal operating mode for ESC in
2H range and on 2WD vehicles.
ESC Partial Off
When in "ESC Partial Off" mode, the TCS
portion of ESC (except for the limited slip
feature described in the TCS section), has
been disabled and the "ESC Off Indicator
Light" will be illuminated.
This mode is intended to be used if the
vehicle is in deep snow, sand, or gravel con-
ditions and more wheel spin than ESC would
normally allow is required to gain traction. To
turn ESC on again, momentarily push the
ESC OFF switch. This will restore the normal
"ESC On" mode of operation.NOTE:
To improve the vehicle’s traction when driving
with snow chains, or starting off in deep
snow, sand, or gravel, it may be desirable to
switch to the "ESC Partial Off" mode by
pushing the "ESC Full Off" switch. Once the
situation requiring ESC to be switched to the
"ESC Partial Off" mode is overcome, turn ESC
back on by momentarily pushing the "ESC
Full Off" switch. This may be done while the
vehicle is in motion.
The ESC will restore to normal ESC On mode
after each key on.
WARNING!
• When in “Partial Off” mode, the TCS
functionality of ESC, (except for the lim-
ited slip feature described in the TCS
section), has been disabled and the
“ESC Off Indicator Light” will be illumi-
nated. When in “Partial Off” mode, the
engine power reduction feature of TCS is
disabled, and the enhanced vehicle sta-
bility offered by the ESC system is re-
duced.
SAFETY
74

WARNING!
• Trailer Sway Control (TSC) is disabled
when the ESC system is in the "Partial
Off" mode.
ESC Activation/Malfunction Indicator Light And
ESC OFF Indicator Light
The “ESC Activation/
Malfunction Indicator Light” in
the instrument cluster will come
on when the ignition is turned to
the ON mode. It should go out
with the engine running. If the “ESC
Activation/Malfunction Indicator Light”
comes on continuously with the engine run-
ning, a malfunction has been detected in the
ESC system. If this light remains on after
several ignition cycles, and the vehicle has
been driven several miles (kilometers) at
speeds greater than 30 mph (48 km/h), see
your authorized dealer as soon as possible to
have the problem diagnosed and corrected.
The “ESC Activation/Malfunction Indicator
Light” (located in the instrument cluster) starts
to flash as soon as the tires lose traction andthe ESC system becomes active. The “ESC
Activation/Malfunction Indicator Light” also
flashes when TCS is active. If the “ESC
Activation/Malfunction Indicator Light” begins
to flash during acceleration, ease up on the
accelerator and apply as little throttle as pos-
sible. Be sure to adapt your speed and driving
to the prevailing road conditions.
NOTE:
• The “ESC Activation/Malfunction Indicator
Light” and the “ESC OFF Indicator Light”
come on momentarily each time the igni-
tion is turned ON.
• Each time the ignition is turned ON, the
ESC system will be on even if it was turned
off previously.
• The ESC system will make buzzing or click-
ing sounds when it is active. This is normal;
the sounds will stop when ESC becomes
inactive following the maneuver that
caused the ESC activation.
The “ESC OFF Indicator Light”
indicates the customer has
elected to have the Electronic
Stability Control (ESC) in a re-
duced mode.
Electronic Roll Mitigation (ERM)
This system anticipates the potential for
wheel lift by monitoring the driver’s steering
wheel input and the speed of the vehicle.
When ERM determines that the rate of
change of the steering wheel angle and vehi-
cle’s speed are sufficient to potentially cause
wheel lift, it then applies the appropriate
brake and may also reduce engine power to
lessen the chance that wheel lift will occur.
ERM can only reduce the chance of wheel lift
occurring during severe or evasive driving
maneuvers; it cannot prevent wheel lift due to
other factors, such as road conditions, leav-
ing the roadway, or striking objects or other
vehicles.
NOTE:
ERM is disabled anytime the ESC is in “Full
Off” mode (if equipped). Refer to “Electronic
Stability Control (ESC)” in this section for a
complete explanation of the available ESC
modes.
75

WARNING!
Many factors, such as vehicle loading,
road conditions and driving conditions,
influence the chance that wheel lift or
rollover may occur. ERM cannot prevent
all wheel lift or roll overs, especially those
that involve leaving the roadway or striking
objects or other vehicles. The capabilities
of an ERM-equipped vehicle must never
be exploited in a reckless or dangerous
manner which could jeopardize the user's
safety or the safety of others.
Trailer Sway Control (TSC)
TSC uses sensors in the vehicle to recognize
an excessively swaying trailer and will take
the appropriate actions to attempt to stop the
sway. TSC will become active automatically
once an excessively swaying trailer is recog-
nized.NOTE:
TSC cannot stop all trailers from swaying.
Always use caution when towing a trailer and
follow the trailer tongue weight recommenda-
tions. Refer to “Trailer Towing” in “Starting
And Operating” for further information.
When TSC is functioning, the “ESC
Activation/Malfunction Indicator Light” will
flash, the engine power may be reduced and
you may feel the brakes being applied to
individual wheels to attempt to stop the
trailer from swaying. TSC is disabled when
the ESC system is in the “Partial Off” or “Full
Off” modes.WARNING!
If TSC activates while driving, slow the
vehicle down, stop at the nearest safe
location, and adjust the trailer load to
eliminate trailer sway.
Hill Descent Control (HDC) — If Equipped
HDC is only intended for low speed off-road
driving. HDC maintains vehicle speed while
descending hills in off-road driving condi-
tions by applying the brakes when necessary.
The symbol indicates the status
of the Hill Descent Control
(HDC) feature. The lamp will be
on solid when HDC is armed.
HDC can only be armed when the
transfer case is in the “4WD LOW” position
and the vehicle speed is less then 30 mph
(48 km/h). If these conditions are not met
while attempting to use the HDC feature, the
HDC indicator light will flash on/off.
When enabled, HDC senses the terrain and acti-
vates when the vehicle is descending a hill. HDC
speed may be adjusted by the driver to suit the
driving conditions. The speed corresponds to the
transmission gear selected.
Gear Approximate HDC Set
Speed
1st 1 mph (1.5 km/h)
2nd 2.5 mph (4 km/h)
SAFETY
76

Gear Approximate HDC Set
Speed
3rd 4 mph (6.5 km/h)
4th 5.5 mph (9 km/h)
DRIVE 7.5 mph (12 km/h)
REVERSE 1 mph (1.5 km/h)
However, the driver can override HDC opera-
tion by applying the brake to slow the vehicle
down below the HDC control speed. If more
speed is desired during HDC control, the
accelerator pedal will increase vehicle speed
in the usual manner. When either the brake or
the accelerator is released, HDC will control
the vehicle at the original set speed.
Enabling HDC
1. Shift the transfer case into 4WD LOW
range. Refer to “Four-Wheel Drive Opera-
tion” in “Starting and Operating” for fur-
ther information.
2. Push the “Hill Descent” button. The “Hill
Descent Control Indicator Light” in the
instrument cluster will turn on solid.NOTE:
• If the transfer case is not in 4WD LOW
range, the “Hill Descent Control Indica-
tor Light” will flash for five seconds and
HDC will not be enabled.
• If the ESC senses that the brakes are
overheating the “Hill Descent Control
Indicator Light” will flash for five sec-
onds and HDC will become deactivated
until the brakes have cooled.
Disabling HDC
Push the “Hill Descent” button or shift the
transfer case out of 4WD LOW range. The
“Hill Descent Control Indicator” light in the
instrument cluster will turn off.
AUXILIARY DRIVING
SYSTEMS
Tire Pressure Monitor System (TPMS)
The Tire Pressure Monitoring System (TPMS)
will warn the driver of a low tire pressure
based on the vehicle recommended cold
placard pressure.The tire pressure will vary with temperature
by about 1 psi (7.0 kPa) for every 12°F
(6.5°C). This means that when the outside
temperature decreases, 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 a vehicle
has not been driven for more than 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 increase 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 rea-
son, including low temperature effects, or
natural pressure 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
placard pressure. Once the “Tire Pressure
77

Monitoring Telltale Light” has been illumi-
nated, the tire pressure must be increased to
the recommended cold placard pressure in
order for the “Tire Pressure Monitoring Tell-
tale Light” to be turned OFF.
NOTE:
When filling warm tires, the tire pressure may
need to be increased up to an additional 4 psi
(30 kPa) above the recommended cold plac-
ard pressure in order to turn the Tire Pressure
Monitoring Telltale Light off.
The system will automatically update and the
“Tire Pressure Monitoring Telltale Light” will
extinguish once the updated tire pressures
have been received. The vehicle may need to
be driven for up to 10 minutes above 15 mph
(24 km/h) to receive this information.
For example, your vehicle may have a recom-
mended cold (parked for more than three
hours) air pressure of 35 psi (241 kPa). If the
ambient temperature is 68°F (20°C) and the
measured tire pressure is 30 psi (207 kPa), a
temperature drop to 20°F (-7°C) will de-
crease the tire pressure to approximately
26 psi (179 kPa). This tire pressure is suffi-
ciently low enough to turn ON the “Tire Pres-sure Monitoring Telltale Light.” Driving the
vehicle may cause the tire pressure to rise to
approximately 30 psi (207 kPa), but the “Tire
Pressure Monitoring Telltale Light” will still
be ON. In this situation, the “Tire Pressure
Monitoring Telltale Light” will turn OFF only
after the tires have been inflated to the vehi-
cle’s recommended cold placard pressure
value.
CAUTION!
• The TPMS has been optimized for the
original equipment tires and wheels.
TPMS pressures and warnings have
been established for the tire size
equipped on your vehicle. Undesirable
system operation or sensor damage may
result when using replacement equip-
ment that is not of the same size, type,
and/or style. The TPM sensor is not de-
signed for use on aftermarket wheels
and may contribute to a poor overall
system performance or sensor damage.
Customers are encouraged to use OEM
wheels to assure proper TPM feature
operation.
CAUTION!
• Using aftermarket tire sealants may
cause the Tire Pressure Monitoring Sys-
tem (TPMS) sensor to become inoper-
able. After using an aftermarket tire
sealant it is recommended that you take
your vehicle to an authorized dealership
to have your sensor function checked.
• After inspecting or adjusting the tire
pressure, always reinstall the valve stem
cap. This will prevent moisture and dirt
from entering the valve stem, which
could damage the Tire Pressure Monitor-
ing Sensor.
NOTE:
• The TPMS is not intended to replace nor-
mal tire care and maintenance, nor to pro-
vide warning of a tire failure or condition.
• The TPMS should not be used as a tire
pressure gauge while adjusting your tire
pressure.
SAFETY
78

• Driving on a significantly under-inflated tire
causes the tire to overheat and can lead to
tire failure. Under-inflation also reduces
fuel efficiency and tire tread life, and may
affect the vehicle’s handling and stopping
ability.
• The TPMS is not a substitute for proper tire
maintenance, and it is the driver’s respon-
sibility to maintain correct tire pressure,
even if under-inflation has not reached the
level to trigger illumination of the “Tire
Pressure Monitoring Telltale Light.”
• Seasonal temperature changes will affect
tire pressure, and the TPMS will monitor
the actual tire pressure in the tire.
Base System
The Tire Pressure Monitor System (TPMS)
uses wireless technology with wheel rim-
mounted electronic sensors to monitor tire
pressure levels. Sensors, mounted to each
wheel as part of the valve stem, transmit tire
pressure readings to the Receiver Module.NOTE:
It is particularly important for you to check
the tire pressure in all of your tires regularly
and to maintain the proper pressure.
The Tire Pressure Monitor System (TPMS)
consists of the following components:
• Receiver Module
• Four Tire Pressure Monitoring Sensors
• Tire Pressure Monitoring Telltale Light
A tire pressure monitoring sensor is located in
the spare wheel if the vehicle is equipped
with a matching full size spare wheel and tire
assembly. The matching full size spare tire
can be used in place of any of the four road
tires. A low spare tire will not cause the “Tire
Pressure Monitoring Telltale Light” to illumi-
nate or the chime to sound while stowed in
the spare location.
The “Tire Pressure Monitoring Tell-
tale Light” will illuminate in the in-
strument cluster, a “LOW TIRE
PRESSURE” message will display in the in-
strument cluster, and an audible chime will
be activated when one or more of the four
active road tire pressures are low. Should thisoccur, you should stop as soon as possible,
check the inflation pressure of each tire on
your vehicle, and inflate each tire to the
vehicle's recommended cold placard pres-
sure value. The system will automatically
update and the “Tire Pressure Monitoring
Telltale Light” will extinguish once the up-
dated tire pressures have been received. The
vehicle may need to be driven for up to
10 minutes above 15 mph (24 km/h) to
receive this information
The “Tire Pressure Monitoring Telltale Light”
will flash on and off for 75 seconds, and will
remain on solid when a system fault is de-
tected. The system fault will also sound a
chime. If the ignition key is cycled, this
sequence will repeat, providing the system
fault still exists. The “Tire Pressure Monitor-
ing Telltale Light” will turn off when the fault
condition no longer exists. A system fault can
occur by any of the following scenarios:
1. Jamming due to electronic devices or driv-
ing next to facilities emitting the same
Radio Frequencies as the TPM sensors.
79

2. Installing some form of aftermarket win-
dow 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.
Vehicles not equipped with instrument clus-
ter display will inform the driver which tire(s)
are low but not provide actual tire pressure.
The low tire ISO telltale will illuminate along
with “LoTIrE” message displayed in the ODO
and then it will scroll to which tire location is
lower than the Placard Value.
Tire location will be displayed as follows:
LF =LeftFront
rF =rightFront
Lr =Leftrear
rr =rightrearNOTE:
• 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) when swapped
with a low pressure road tire. 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, and a chime to sound. 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 the road tires are below the low pressure
warning threshold.
• If your vehicle is not equipped with a
matching full-size spare wheel and tire as-
sembly, 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, a chime will
sound and the “Tire Pressure MonitoringTelltale Light” will turn ON. 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. For each subsequent ignition key
cycle, a chime will sound and the “Tire
Pressure Monitoring Telltale Light” will
flash on and off for 75 seconds and then
remain on solid. 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 and the “Tire
Pressure Monitoring Telltale Light” will
turn OFF, 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 10 minutes
above 15 mph (24 km/h) in order for the
TPMS to receive this information.
Premium System — If Equipped
The Tire Pressure Monitor System (TPMS)
uses wireless technology with wheel rim-
mounted electronic sensors to monitor tire
pressure levels. Sensors, mounted to each
wheel as part of the valve stem, transmit tire
pressure readings to the Receiver Module.
SAFETY
80

NOTE:
It is particularly important, for you to regu-
larly check the tire pressure in all of your tires
and to maintain the proper pressure.
The Tire Pressure Monitor System (TPMS)
consists of the following components:
• Receiver Module
• Four Tire Pressure Monitoring Sensors• Various Tire Pressure Monitoring System
Messages, which display in the instrument
cluster, and a graphic displaying tire pres-
sures
• Tire Pressure Monitoring Telltale Light
A tire pressure monitoring sensor is located in
the spare wheel, if the vehicle is equipped
with a matching full-size spare wheel and tire
assembly. The matching full-size spare tire
can be used in place of any of the four road
tires.
Tire Pressure Monitoring Low Pressure Warn-
ingsThe Tire Pressure Monitoring Telltale
Light will illuminate in the instrument
cluster, and an audible chime will be
activated, when one or more of the four active
road tire pressures are low. A graphic display of
the pressure value(s) with the low tire(s) high-
lighted or in a different color will also be
displayed. Refer to “Instrument Cluster Dis-
play” in “Getting To Know Your Instrument
Panel” for further information.
NOTE:
Your system can be set to display pressure
units in PSI, kPa, or BAR.
Should a low tire condition occur on any of
the four active road tire(s), you should stop as
soon as possible, and inflate the low tire(s)
that is highlighted or shown in a different
color on the graphic display to the vehicle’s
recommended cold tire pressure inflation
value. The system will automatically update,
the graphic display of the pressure value(s)
Tire Pressure Monitor Display
Tire Pressure Monitor Display
81

will no longer be highlighted or shown in a
different color and the Tire Pressure Monitor-
ing Telltale Light will extinguish once the
updated tire pressure(s) have been received.
NOTE:
When filling warm tires, the tire pressure may
need to be increased up to an additional 4 psi
(30 kPa) above the recommended cold plac-
ard pressure in order to turn the Tire Pressure
Monitoring Telltale Light off.
The vehicle may need to be driven for up to
10 minutes above 15 mph (24 km/h) to
receive this information.
Service TPM System Warning
The “Tire Pressure Monitoring Telltale Light”
will flash on and off for 75 seconds, and
remain on solid when a system fault is de-
tected. The system fault will also sound a
chime. The instrument cluster 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 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 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 follow-
ing:
• Jamming due to electronic devices or driv-
ing 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:
• 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) when swappedwith a low pressure road tire. In the event
that the matching full-size spare tire is
swapped with a low pressure road tire, the
next ignition switch cycle will still show the
“Tire Pressure Monitoring Telltale Light” to
be ON, a chime to sound, a “LOW TIRE”
message to appear in the instrument clus-
ter, and the graphic display will still show
the low tire pressure value highlighted or
shown in a different color. Driving the ve-
hicle 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 threshold.
• If your vehicle is not equipped with a
matching full-size spare wheel and tire as-
sembly, 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 switch cycle, the “Tire
Pressure Monitoring Telltale Light” will re-
main ON, a chime will sound, and the
instrument cluster will still display a high-
lighted or different color pressure value in
SAFETY
82

the graphic display. After driving the ve-
hicle 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 instrument cluster will display
a “SERVICE TPM SYSTEM" message for a
minimum of 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 Telltale Light” will flash on and
off for 75 seconds and then remain on
solid, and the instrument cluster will dis-
play a "SERVICE TPM SYSTEM" message
for a minimum of 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 Tell-
tale Light” will turn OFF and the graphic in the
instrument cluster will display a new pressure
value instead of dashes (- -), as long as no tire
pressure is below the low-pressure warninglimit in any of the four active road tires. The
vehicle may need to be driven for up to 10 min-
utes 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 Moni-
toring (TPM) Sensors. Then, drive the vehicle
for 10 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 dis-
play 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 cluster 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 10 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 SYS-
TEM” message and then display pressure
values in place of the dashes. On the next
ignition cycle the "SERVICE TPM SYSTEM"
message will no longer be displayed as long
as no system fault exists.
83