2021 JEEP GRAND CHEROKEE ECU

Cavity Cartridge Fuse Micro Fuse Description
F42 – 20 Amp Yellow Horn
F44 – 10 Amp Red Diagnostic Port
(*)
F45 – 5 Amp Tan Cyber Security Gateway
(*)
F49 – 10 Amp Red Integrated Central Stack/Climate Control
F50 – 20 Amp Yellow Air Suspension Control Module/Slip Differential - If Equipped
(*)
F51 – 15 Amp Blue KIN/RF HUB/Steering Column Lock — If Equipped
(*)
F53 – 20 Amp Yellow Trailer Tow – Left Turn/Stop Lights — If Equipped
(*)
F56 – 15 Amp Blue Additional Content (Diesel Engine Only)
F57 – 20 Amp Yellow NOX Sensor — If Equipped
(*)
F58 – 15 Amp Blue HID Headlamps LH — If Equipped
(*)
F59 – 10 Amp Red Purging Pump (Diesel Engine Only)
(*)
F60 – 15 Amp Blue Transmission Control Module
(*)
F61 – 10 Amp Red Transmission Control Module/PM Sensor (Diesel Engine Only)
(*)
F62 – 10 Amp Red Air Conditioning Clutch
213

JACKING AND TIRE
CHANGING
WARNING!
• Do not attempt to change a tire on the
side of the vehicle close to moving traf-
fic. Pull far enough off the road to avoid
the danger of being hit when operating
the jack or changing the wheel.
• Being under a jacked-up vehicle is dan-
gerous. The vehicle could slip off the
jack and fall on you. You could be
crushed. Never put any part of your body
under a vehicle that 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.
• Never start or run the engine while the
vehicle is on a jack.
• The jack is designed to be used as a tool
for changing tires only. The jack should
not be used to lift the vehicle for service
purposes. The vehicle should be jacked
on a firm level surface only. Avoid ice or
slippery areas.
Run Flat Tires — SRT Models
SRT models are equipped with “run flat”
tires. Run flat tires allow the vehicle to be
driven approximately 50 miles (80 km) at
55 mph (88 km/h). Tire service should be
obtained to avoid prolonged run flat feature
usage.
WARNING!
Do not exceed 50 mph (80 km/h) if the
“Tire Pressure Monitoring Telltale Light” is
illuminated. Vehicle handling and braking
may be reduced. You could have a collision
and be severely or fatally injured.
Jack Location
The scissor-type jack and tire changing tools
are located in the rear cargo area, below the
load floor.
Spare Tire Stowage
The spare tire is stowed under the load floor
in the rear cargo area and is secured to the
body with a special wing nut.
Spare Tire/Jack And Tools
1 — Cap-Less Fuel Fill Funnel
2 — Jack
3 — Tire Changing Tools
4 — Spare Tire
217

WARNING!
raised vehicle, take it to a service center
where it can be raised on a lift.
• Only use the jack in the positions indi-
cated 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 in-
flated, are securely stowed, spares must
be stowed with the valve stem facing the
ground.
• The jack should be used on level firm
ground wherever possible.
• It is recommended that the wheels of
the vehicle be chocked, and that no
person should be remain in a vehicle
that is being jacked.
• No person should place any portion of
their body under a vehicle that is sup-
ported by a jack.
CAUTION!
Do not attempt to raise the vehicle by
jacking on locations other than those indi-
cated in the Jacking Instructions for this
vehicle.
1. Remove the spare tire, jack, and tools
from storage.
2. Loosen (but do not remove) the wheel lug
nuts by turning them to the left, one turn,
while the wheel is still on the ground.
3. Assemble the jack and jacking tools.
Warning Label
Jack And Tools Assembled
Jacking Locations
219

WARNING!
Raising the vehicle higher than necessary
can make the vehicle less stable. It could
slip off the jack and hurt someone near it.
Raise the vehicle only enough to remove
the tire.
7. Remove the lug nuts and wheel.
8. Position the spare wheel/tire on the ve-
hicle and install the lug nuts with the
cone-shaped end toward the wheel.
Lightly tighten the nuts.
CAUTION!
Be sure to mount the spare tire with the
valve stem facing outward. The vehicle
could be damaged if the inflatable spare
tire is mounted incorrectly.
WARNING!
To avoid the risk of forcing the vehicle off
the jack, do not tighten the wheel nuts
fully until the vehicle has been lowered.
WARNING!
Failure to follow this warning may result in
serious injury.
9. Lower the vehicle by turning the jack
screw counterclockwise, and remove the
jack and wheel blocks.
10. F
inish tightening the lug nuts. Push down
on the wrench while at the end of the
handle for increased leverage. Tighten the
lug nuts in a star pattern until each nut has
been tightened twice. For correct lug nut
torque, refer to “Torque Specifications” in
“Technical Specifications”. If in doubtabout the correct tightness, have them
checked with a torque wrench by an autho-
rized dealer or at a service station.
11. Lower the jack to the fully closed posi-
tion and return it and the tools to the
proper positions in the foam tray.
12. R
emove the small center cap and securely
store the road wheel in the cargo area.
13. Have the aluminum road wheel and tire
repaired as soon as possible, properly
secure the spare tire with the special
Installing Spare Wheel/Tire
Spare Tire
221

CAUTION!
Driving with a hot cooling system could
damage your vehicle. If the temperature
gauge reads HOT (H), pull over and stop
the vehicle. Idle the vehicle with the air
conditioner turned off until the pointer
drops back into the normal range. If the
pointer remains on HOT (H), and you hear
continuous chimes, turn the engine off
immediately and call for service.
MANUAL PARK RELEASE
WARNING!
Always secure your vehicle by fully apply-
ing the parking brake before activating the
Manual Park Release. In addition, you
should be seated in the driver’s seat with
your foot firmly on the brake pedal when
activating the Manual Park Release. Acti-
vating the Manual Park Release will allow
your vehicle to roll away if it is not secured
by the parking brake, or by proper connec-
tion to a tow vehicle. Activating the
WARNING!
Manual Park Release on an unsecured
vehicle could lead to serious injury or
death for those in or around the vehicle.
In order to move the vehicle in cases where
the transmission will not shift out of PARK
(such as a dead battery), a Manual Park
Release is available.
Follow these steps to use the Manual Park
Release:
1. Firmly apply the parking brake.
2. Open the center console and locate the
Manual Park Release cover, remove it by
snapping the cover away from the console
hinges.3. Press and maintain firm pressure on the
brake pedal.
4. Using a screwdriver or similar tool, push
the metal latch in towards the tether
strap.
5. While the metal latch is in the open posi-
tion, pull upward on the tether strap until
the lever clicks and latches in the released
position. The transmission is now out of
PARK and the vehicle can be moved.
Manual Park Release Cover Removed
229

Towing ConditionWheels OFF The
GroundTwo-Wheel Drive ModelsFour-Wheel Drive
Models Without
4WD LOW RangeFour-Wheel Drive Models With 4WD LOW
Range
Flat Tow NONEIf transmission is operable:
•
Transmission in NEUTRAL
• 30 mph (48 km/h) max speed
• 30 miles (48 km) max distanceNOT ALLOWEDSee instructions in “Recreational Towing”
•
Transmission in PARK
• Transfer case in NEUTRAL (N)
• Tow in forward direction
• Ignition in ACC or ON/RUN mode (or
disconnect negative battery cable)
Wheel Lift Or Dolly
To wFrontNOT ALLOWED NOT ALLOWED
Rear OKNOT ALLOWED NOT ALLOWED
On Trailer ALL BEST METHOD OK BEST METHOD
Proper towing or lifting equipment is required
to prevent damage to your vehicle. Use only
tow bars and other equipment designed for
this purpose, following equipment manufac-
turer’s instructions. Use of safety chains is
mandatory. Attach a tow bar or other towing
device to main structural members of the
vehicle, not to bumpers or associated brack-
ets. State and local laws regarding vehicles
under tow must be observed.
If you must use the accessories (wipers, de-
frosters, etc.) while being towed, the ignition
must be in the ON/RUN mode, not the ACC
mode.If the vehicle's battery is discharged, refer to
“Manual Park Release” in this section for
instructions on shifting the transmission out
of PARK for towing.
CAUTION!
• Do not use sling type equipment when
towing. Vehicle damage may occur.
• When securing the vehicle to a flat bed
truck, do not attach to front or rear
suspension components. Damage to
your vehicle may result from improper
towing.
CAUTION!
• If the vehicle being towed requires steer-
ing, the ignition switch must be in the
ACC or ON/RUN mode, not in the LOCK/
OFF mode.
NOTE:
SRT vehicles and 4WD models without 4WD
LOW range should only be towed with all four
wheelsOFFthe ground.
IN CASE OF EMERGENCY
232

blades, this will help blade performance. To
prevent freeze-up of your windshield washer
system in cold weather, select a solution or
mixture that meets or exceeds the tempera-
ture range of your climate. This rating infor-
mation can be found on most washer fluid
containers.
WARNING!
Commercially available windshield washer
solvents are flammable. They could ignite
and burn you. Care must be exercised
when filling or working around the washer
solution.
CAUTION!
Do not travel with the windshield washer
fluid reservoir empty: the windshield
washer is essential for improving visibility.
Brake System
In order to assure brake system performance,
all brake system components should be in-
spected periodically. Refer to the “Mainte-
nance Plan” in this section for the proper
maintenance intervals.
WARNING!
Riding the brakes can lead to brake failure
and possibly a collision. Driving with your
foot resting or riding on the brake pedal
can result in abnormally high brake tem-
peratures, excessive lining wear, and pos-
sible brake damage. You would not have
your full braking capacity in an emergency.
Fluid Level Check — Brake Master Cylinder
The fluid level of the master cylinder should
be checked whenever the vehicle is serviced,
or immediately if the brake system warning
light is on. If necessary, add fluid to bring
level within the designated marks on the side
of the reservoir of the brake master cylinder.
Be sure to clean the top of the master cylin-
der area before removing cap. With disc
brakes, fluid level can be expected to fall asthe brake pads wear. Brake fluid level should
be checked when pads are replaced. If the
brake fluid is abnormally low, check the sys-
tem for leaks.
Refer to “Fluids And Lubricants” in “Techni-
cal Specifications” for further information.
WARNING!
• Use only manufacturer's recommended
brake fluid. Refer to “Fluids And Lubri-
cants” in “Technical Specifications” for
further information. Using the wrong
type of brake fluid can severely damage
your brake system and/or impair its per-
formance. The proper type of brake fluid
for your vehicle is also identified on the
original factory installed hydraulic mas-
ter cylinder reservoir.
• To avoid contamination from foreign
matter or moisture, use only new brake
fluid or fluid that has been in a tightly
closed container. Keep the master cylin-
der reservoir cap secured at all times.
Brake fluid in a open container absorbs
moisture from the air resulting in a lower
255

CYBERSECURITY
Your vehicle may be a connected vehicle and
may be equipped with both wired and wire-
less networks. These networks allow your
vehicle to send and receive information. This
information allows systems and features in
your vehicle to function properly.
Your vehicle may be equipped with certain
security features to reduce the risk of unau-
thorized and unlawful access to vehicle sys-
tems and wireless communications. Vehicle
software technology continues to evolve over
time and FCA, working with its suppliers,
evaluates and takes appropriate steps as
needed. Similar to a computer or other de-
vices, your vehicle may require software up-
dates to improve the usability and perfor-
mance of your systems or to reduce the
potential risk of unauthorized and unlawful
access to your vehicle systems.
The risk of unauthorized and unlawful access
to your vehicle systems may still exist, even if
the most recent version of vehicle software
(such as Uconnect software) is installed.
WARNING!
• It is not possible to know or to predict all
of the possible outcomes if your vehi-
cle’s systems are breached. It may be
possible that vehicle systems, including
safety related systems, could be im-
paired or a loss of vehicle control could
occur that may result in an accident
involving serious injury or death.
• ONLY insert media (e.g., USB, SD card,
or CD) into your vehicle if it came from a
trusted source. Media of unknown origin
could possibly contain malicious soft-
ware, and if installed in your vehicle, it
may increase the possibility for vehicle
systems to be breached.
• As always, if you experience unusual
vehicle behavior, take your vehicle to
your nearest authorized dealer
immediately.NOTE:
• FCA or your dealer may contact you directly
regarding software updates.
• To help further improve vehicle security
and minimize the potential risk of a secu-
rity breach, vehicle owners should:
– Only connect and use trusted media
devices (e.g. personal mobile phones,
USBs, CDs).
Privacy of any wireless and wired communi-
cations cannot be assured. Third parties may
unlawfully intercept information and private
communications without your consent. For
further information, refer to “Onboard Diag-
nostic System (OBD II) Cybersecurity” in
“Getting To Know Your Instrument Panel” in
your Owner’s Manual.
MULTIMEDIA
300