service JEEP CHEROKEE TRAILHAWK 2018 User Guide

The passenger seat assembly contains critical OCS compo-
nents that may affect the Passenger Advanced Front Air Bag
inflation. In order for the OCS to properly classify the seated
weight of a front seat passenger, the OCS components must
function as designed. Do not make any modifications to the
front passenger seat components, assembly, or to the seat
cover. If the seat, trim cover, or cushion needs service for any
reason, take the vehicle to your authorized dealer. Only FCA
US LLC approved seat accessories may be used.
The following requirements must be strictly followed:
•Do not modify the front passenger seat assembly or
components in any way.
• Do not use prior or future model year seat covers or
cushions not designated by FCA US LLC for the specific
model being repaired. Always use the correct seat cover
and cushion specified for the vehicle.
• Do not replace the seat cover or cushion with an
aftermarket seat cover or cushion.
• Do not add a secondary seat cover or mat.
• At no time should any Supplemental Restraint System
(SRS) component or SRS related component or fastener be modified or replaced with any part except those
which are approved by FCA US LLC.

SafeHold can be temporarily bypassed by pushing the
Electric Park Brake Switch while the driver door is open.
Once manually bypassed, SafeHold will be enabled again
once the vehicle reaches 12 mph (20 km/h) or the ignition
is turned to the OFF position and back to ON again.
Brake Service Mode
We recommend having your brakes serviced by your
authorized dealer. You should only make repairs for which
you have the knowledge and the right equipment. You
should only enter Brake Service Mode during brake ser-
vice.
When servicing your rear brakes, it may be necessary for
you or your technician to push the rear piston into the rear
caliper bore. With the electric park brake system, this can
only be done after retracting the Electric Park Brake
actuator. Fortunately, actuator retraction can be done easily
by entering the Brake Service Mode through the Uconnect
Settings in your vehicle. This menu based system will
guide you through the steps necessary to retract the EPB
actuator in order to perform rear brake service.Service Mode has requirements that must be met in order
to be activated:
•
The vehicle must be at a standstill.
• The park brake must be unapplied.
• The transmission must be in PARK or NEUTRAL.
While in service mode, the Electric Park Brake fault lamp
will flash continuously while the ignition is ON.
When brake service work is complete, the following steps
must be followed to reset the park brake system to normal
operation:
• Ensure the vehicle is at a standstill.
• Press the brake pedal with moderate force.
• Apply the Electric Park Brake Switch.

a close object as a sensor problem, causing the “PARK-
SENSE UNAVAILABLE SERVICE REQUIRED” message
to be displayed in the instrument cluster display.
•ParkSense should be disabled when the liftgate is in the
open position and the vehicle is in REVERSE. An open
liftgate could provide a false indication that an obstacle
is behind the vehicle.

WARNING!(Continued)
to turn around. To do so may result in tipping and
rolling the vehicle. Always back straight down a hill in
REVERSE gear carefully. Never back down a hill in
NEUTRAL using only the brake.
NOTE: Remember, never drive diagonally across a hill -
drive straight up or down.
If the wheels start to slip as you approach the crest of a hill,
ease off the accelerator and maintain headway by turning
the front wheels slowly left and right. This may provide a
fresh “bite” into the surface and may provide traction to
complete the climb.
Traction Downhill
Shift the transmission into a low gear and the 4WD System
to 4WD LOW range or Select Hill Descent Control if
equipped (refer to Safety Featuresin the “Safety” section
for further information). Let the vehicle go slowly down
the hill with all four wheels turning against engine com-
pression drag. This will permit you to control the vehicle
speed and direction. When descending mountains or hills, repeated braking can
cause brake fade with loss of braking control. Avoid
repeated heavy braking by downshifting the transmission
whenever possible.
After Driving Off-Road
Off-road operation puts more stress on your vehicle than
does most on-road driving. After going off-road, it is
always a good idea to check for damage.
•
Completely inspect the underbody of your vehicle.
Check tires, body structure, steering, suspension, and
exhaust system for damage.
• Inspect the radiator for mud and debris and clean as
required.
• Check threaded fasteners for looseness, particularly on
the chassis, drivetrain components, steering, and sus-
pension. Retighten them, if required, and torque to the
values specified in the Service Manual.
• Check for accumulations of plants or brush. These things
could be a fire hazard. They might hide damage to fuel
lines, brake hoses, axle pinion seals, and propeller shafts.
6
STARTING AND OPERATING 367

WARNING!(Continued)
can cause the 9-1-1 Call system to fail, never add
aftermarket equipment (e.g., two-way mobile radio,
CB radio, data recorder, etc.) to your vehicle’s electri-
cal system or modify the antennas on your vehicle.
IF YOUR VEHICLE LOSES BATTERY POWER FOR
ANY REASON (INCLUDING DURING OR AFTER
AN ACCIDENT), THE UCONNECT FEATURES,
APPS AND SERVICES, AMONG OTHERS, WILL
NOT OPERATE.
• Modifications to any part of the 9-1-1 Call system
could cause the air bag system to fail when you need
it. You could be injured if the air bag system is not
there to help protect you.
9-1-1 Call System Limitations
Vehicles sold in Canada and Mexico DO NOThave 9-1-1
Call system capabilities.
9-1-1 or other emergency line operators in Canada and
Mexico may not answer or respond to 9-1-1 system calls.
If the 9-1-1 Call system detects a malfunction, any of the
following may occur at the time the malfunction is de-
tected, and at the beginning of each ignition cycle: •
The Rearview Mirror light located between the ASSIST
and 9-1-1 buttons will continuously be illuminated red.
• The Device Screen will display the following message
“Vehicle device requires service. Please contact your
dealer.”
• An In-Vehicle Audio message will state “Vehicle device
requires service. Please contact your dealer.”

WARNING!(Continued)
•Do not let anyone sit in the vehicle when it is on a
jack.
• Do not get under the vehicle when it is on a jack. If
you need to get under a raised vehicle, take it to a
service center where it can be raised on a lift.
• Only use the jack in the positions indicated and for
lifting this vehicle during a tire change.
• If working on or near a roadway, be extremely
careful of motor traffic.
• To assure that spare tires, flat or inflated, are securely
stowed, spares must be stowed with the valve stem
facing the ground.

WARNING!
•Do not attempt to seal a tire on the side of the vehicle
closest to traffic. Pull far enough off the road to avoid
the danger of being hit when using the Tire Service
Kit.
• Do not use Tire Service Kit or drive the vehicle under
the following circumstances:
– If the puncture in the tire tread is approximately 1/4 inch (6 mm) or larger.
– If the tire has any sidewall damage.
– If the tire has any damage from driving with extremely low tire pressure.
– If the tire has any damage from driving on a flat tire.
– If the wheel has any damage.
– If you are unsure of the condition of the tire or the wheel.
• Keep Tire Service Kit away from open flames or heat
source.
• A loose Tire Service Kit thrown forward in a collision
or hard stop could endanger the occupants of the
vehicle. Always stow the Tire Service Kit in the place
(Continued)

If the tire inflates to the recommended pressure or is at
least 26 psi (1.8 Bar) pressure within 15 minutes:
1. Push the Power Button (4) to turn off the Tire ServiceKit.
2. Remove the Speed Limit sticker from the top of the Sealant Bottle (1) and place the sticker on the instrument
panel.
3. Immediately disconnect the Sealant Hose (6) from the valve stem, reinstall the cap on the fitting at the end
of the hose, and place the Tire Service Kit in the
vehicle storage location. Quickly proceed to (D) “Drive
Vehicle.”

5. Position the new Sealant Bottle (1) in the housing so thatthe Sealant Hose (6) aligns with the hose slot in the front
of the housing. Push the bottle into the housing. An
audible click will be heard indicating the bottle is locked
into place.
6. Verify that the cap is installed on the fitting at the end of the Sealant Hose (6) and return the hose to its storage
area (located on the bottom of the air pump).
7. Return the Tire Service Kit to its storage location in the vehicle.
JUMP STARTING
If your vehicle has a discharged battery, it can be jump
started using a set of jumper cables and a battery in another
vehicle or by using a portable battery booster pack. Jump
starting can be dangerous if done improperly, so please
follow the procedures in this section carefully.
NOTE: When using a portable battery booster pack, follow
the manufacturer ’s operating instructions and precautions.

WARNING!
•You can be badly injured working on or around a
motor vehicle. Do only service work for which you
have the knowledge and the right equipment. If you
have any doubt about your ability to perform a
service job, take your vehicle to a competent me-
chanic.
• Failure to properly inspect and maintain your vehicle
could result in a component malfunction and effect
vehicle handling and performance. This could cause
an accident.
Heavy Duty Use Of The Vehicle
Change engine oil at 4,000 miles (6,500 km) or 350 hours of
engine run time if the vehicle is operated in a dusty and off
road environment or is operated predominately at idle or
only very low engine RPM’s. This type of vehicle use is
considered Severe Duty.
422 SERVICING AND MAINTENANCE