ECU JEEP WRANGLER UNLIMITED 2021 Owner handbook (in English)

191
F96–10 Amp Red PWR MIRROR SW
F97 –20 Amp Yellow RADIO/TBM
F98 –10 Amp Red SW BANK-HD ELEC/OFF ROAD
(*)
F99 – –Spare
F100 30 Amp Pink –ESC-ECU & VALVES
(*)
F101 30 Amp Pink –DriveTrain Control Module (DTCM)
(*)
F102 –15 Amp Blue DUAL USB PORT
F103 –15 Amp Blue HD ACCY #3 — If Equipped
(*)
F104 –15 Amp Blue PPU COOL PUMP — If Equipped
(*)
F105 –10 Amp Red Integrated Center Stack (ICS)/Heat Ventilation Air
Conditioning (HVAC)
(*)
F106 40 Amp Green –Electronic Speed Control (ESC)-PUMP MTR
(*)
F107 –20 Amp Yellow TRAILER TOW STOP/TURN LT — If Equipped
F108 –15 Amp Blue HD ACCY #4 — If Equipped
(*)
CavityCartridge Fuse Micro Fuse Description
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193
Jack Location
The jack and lug wrench are located in the
rear cargo area. To remove jack and tools
proceed as follows:
1. Lift the load floor in the cargo area.Load Floor
NOTE:
The load floor can be removed for easier
access by pulling the load floor directly rear -
ward
2. Remove the hardware storage cover by pinching the latch on the left side and
pulling upward. Hardware Storage Cover Latch
3. Turn the plastic wing nut counterclock -
wise to loosen the jack from the storage
bin.
Plastic Wing Nut Location
4. Remove tool kit and assemble tools.
Spare Tire Removal
1. To remove the spare tire from the carrier, remove the tire cover, if equipped.
NOTE:
The spare wheel is mounted on the outside of
the tailgate, protected by a plastic cover with
fasteners. Under traffic regulations, the
cover must not be removed or insecurely
fixed during use of the vehicle on the public
highway. Reference should be made to local
laws and regulations. If the spare wheel is
used, before continuing your journey check
that the damaged wheel is securely mounted
and the cover is correctly fixed in place. Also
take care not to obstruct the rear camera
2. Remove the Rear Camera Cover by turning the lock bolt to the counterclock -
wise with the #T40 Torx head driver and
ratchet from the supplied tool kit.
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195
(Continued)
Jacking Instructions
Jack Warning Label1. Remove the spare tire, jack and tools
from the stored location.
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. Connect the jack handle driver to the
extension, then to the lug wrench.
Assembled Jack And Tools
WARNING!
Carefully follow these tire changing
warnings to help prevent personal injury or
damage to your vehicle:
Always park on a firm, level surface as
far from the edge of the roadway as
possible before raising the vehicle.
Turn on the Hazard Warning flashers.
Block the wheel diagonally opposite the
wheel to be raised.
Apply the parking brake firmly and shift
an automatic transmission to PARK.
Never start or run the engine with the
vehicle on a jack.
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 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
inflated, are securely stowed, spares
must be stowed with the valve stem
facing the ground.
WARNING! (Continued) CAUTION!
Do not attempt to raise the vehicle by
jacking on locations other than those
indicated.
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197
10. Finish tightening the lug nuts. Pushdown on the wrench while tightening for
increased leverage. Alternate nuts until
each nut has been tightened twice. Refer
to “Wheel And Tire Torque Specifica -
tions” in “Technical Specifications” for
correct lug nut torque.
11. After 25 miles (40 km), check the lug nut torque with a torque wrench to
ensure that all lug nuts are properly
seated against the wheel.
12. Remove the jack assembly and wheel blocks.
13. Secure the jack and tools in their proper locations.
14. Secure the damaged wheel/tire on the spare tire carrier. Torque down lug nuts
and locking lug nut.
15. Return the lock bolt to the lock position on the camera cover by turning the lock
clockwise using the provided #40 Torx
head driver and ratchet. Then, reinstall
the camera cover by slipping it over the
camera/tire carrier until it snaps into
place.
Road Tire Installation
1. Mount the road tire on the axle.
2. Install the remaining lug nuts with thecone shaped end of the nut toward the
wheel. Lightly tighten the lug nuts. 3. Lower the vehicle to the ground by
turning the jack handle counterclock -
wise.
4. Finish 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 the correct lug nut torque refer to
“Wheel And Tire Torque Specifications”
in “Technical Specifications”. If in doubt
about the correct tightness, have them
checked with a torque wrench by an
authorized dealer or service station.
5. After 25 miles (40 km), check the lug nut torque with a torque wrench to
ensure that all lug nuts are properly
seated against the wheel.
WARNING!
A loose tire or jack thrown forward in a
collision or hard stop, could endanger the
occupants of the vehicle. Always stow the
jack parts and the spare tire in the places
provided.
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.
Failure to follow this warning may result in
serious injury.
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IN CASE OF EMERGENCY
204
IF YOUR ENGINE
OVERHEATS
In any of the following situations, you can
reduce the potential for overheating by
taking the appropriate action.
On the highways — slow down.
In city traffic — while stopped, shift trans-
mission into NEUTRAL (N), but do not
increase engine idle speed.NOTE:
There are steps that you can take to slow
down an impending overheat condition:
If your Air Conditioner (A/C) is on, turn it
off. The A/C system adds heat to the
engine cooling system and turning the A/C
off can help remove this heat.
You can also turn the temperature control
to maximum heat, the mode control to
floor and the blower control to high. This
allows the heater core to act as a supple-
ment to the radiator and aids in removing
heat from the engine cooling system.
MANUAL PARK RELEASE
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.
WARNING!
You or others can be badly burned by hot
engine coolant (antifreeze) or steam from
your radiator. If you see or hear steam
coming from under the hood, do not open
the hood until the radiator has had time to
cool. Never try to open a cooling system
pressure cap when the radiator or coolant
bottle is hot.
WARNING!
Always secure your vehicle by fully
applying 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. Activating the Manual Park
Release will allow your vehicle to roll away
if it is not secured by the parking brake, or
by proper connection to a tow vehicle.
Activating the Manual Park Release on an
unsecured vehicle could lead to serious
injury or death for those in or around the
vehicle.
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205
To push or tow the vehicle in cases where the
transmission will not shift out of PARK (P)
(such as a depleted battery), a Manual Park
Release is available.
Follow these steps to use the Manual Park
Release:
1. Firmly apply the parking brake.
2. Using a small screwdriver, or similar tool,remove the manual park release cover,
located above the gear selector, to access
the release tether strap.
Manual Park Release Cover 3. Fish the tether strap up through the
opening in the console base.
Tether Strap
4. Press and maintain firm pressure on the brake pedal.
5. Pull the tether strap up and to the left until the release lever locks into place in
the vertical position. The vehicle is now
out of PARK and can be moved. Release
the parking brake only when the vehicle
is securely connected to a tow vehicle. To Reset The Manual Park Release:
1. Pull upward on the tether strap, releasing
it from the “locked” position.
2. Lower the Manual Park Release lever downward and to the right, into its orig -
inal position.
3. Tuck the tether strap into the base of the console, and reinstall the cover.
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207(Continued)
TOWING A DISABLED VEHICLE
This section describes procedures for towing a disabled vehicle using a commercial towing service. If the transmission and drivetrain are oper-
able, disabled vehicles may also be towed as described under “Recreational Towing” in the “Starting And Operating” section.

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 manufacturer’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 associ -
ated brackets. State and local laws regarding vehi -
cles under tow must be observed.

If you must use the accessories (wipers,
defrosters, etc.) while being towed, the igni -
tion must be in the ON/RUN position, not the
ACC position. If the vehicle's battery is discharged, refer to
“Manual Park Release” in this chapter for
instructions on shifting the automatic trans
-
mission out of PARK in order to move the
vehicle.
Towing Condition
Wheels OFF The Ground 4WD MODELS
Flat Tow NONESee instructions under “Recreational Towing” in “Starting And
Operating”.
• Automatic Transmission in PARK
• Transfer Case in NEUTRAL
• Disconnect negative battery cable
• Tow in forward direction
Wheel Lift Or Dolly Tow Front NOT ALLOWED
Rear NOT ALLOWED
Flatbed ALL BEST METHOD
CAUTION!
Do not use sling type equipment when
towing. Vehicle damage may occur.
When securing the vehicle to a flatbed
truck, do not attach to front or rear
suspension components. Damage to your
vehicle may result from improper towing.
If the vehicle being towed requires
steering, the ignition switch must be in
the ACC or ON/RUN mode, not in the
OFF mode.
CAUTION! (Continued)
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231
Automatic Transmission
Selection Of Lubricant
It is important to use the proper transmission
fluid to ensure optimum transmission perfor-
mance and life. Use only the manufacturer's
specified transmission fluid. Refer to “Fluids
And Lubricants” in “Technical Specifica -
tions” for fluid specifications. It is important
to maintain the transmission fluid at the
correct level using the recommended fluid.
NOTE:
No chemical flushes should be used in any
transmission; only the approved lubricant
should be used.
Special Additives
The manufacturer strongly recommends
against using any special additives in the
transmission. Automatic Transmission Fluid
(ATF) is an engineered product and its
performance may be impaired by supple -
mental additives. Therefore, do not add any
fluid additives to the transmission. Avoid
using transmission sealers as they may
adversely affect seals.
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 cylinder
reservoir cap secured at all times. Brake
fluid in a open container absorbs moisture
from the air resulting in a lower boiling
point. This may cause it to boil unexpect -
edly during hard or prolonged braking,
resulting in sudden brake failure. This
could result in a collision.

Overfilling the brake fluid reservoir can
result in spilling brake fluid on hot
engine parts, causing the brake fluid to
catch fire. Brake fluid can also damage
painted and vinyl surfaces, care should
be taken to avoid its contact with these
surfaces.
Do not allow petroleum based fluid to
contaminate the brake fluid. Brake seal
components could be damaged, causing
partial or complete brake failure. This
could result in a collision.
WARNING! (Continued)
CAUTION!
Using a transmission fluid other than the
manufacturer’s recommended fluid may
cause deterioration in transmission shift
quality and/or torque converter shudder.
Refer to “Fluids And Lubricants” in
“Technical Specifications” for fluid
specifications.
CAUTION!
Do not use chemical flushes in your
transmission as the chemicals can damage
your transmission components. Such
damage is not covered by the New Vehicle
Limited Warranty.
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260
MULTIMEDIA
UCONNECT SYSTEMS
For detailed information about your Ucon-
nect system, refer to your Uconnect Owner’s
Manual Supplement.
NOTE:
Uconnect screen images are for illustration
purposes only and may not reflect exact soft -
ware for your vehicle.
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
systems 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 devices, your vehicle may require soft -
ware updates to improve the usability and performance 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.
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). WARNING!
It is not possible to know or to predict all
of the possible outcomes if your vehicle’s
systems are breached. It may be possible
that vehicle systems, including safety
related systems, could be impaired 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.

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267
Google Maps™ Data And Cellular Coverage
NOTE:
Requires compatible smartphone running
Android™ 5.0 (Lollipop) or higher, and
download app on Google Play. Android™,
Android Auto™ and Google Play are trade -
marks of Google Inc.
Apple CarPlay® Integration
NOTE:
Feature availability depends on your carrier
and mobile phone manufacturer. Some
Apple CarPlay® features may or may not be
available in every region and/or language. Uconnect works seamlessly with Apple
CarPlay®, the smarter, more secure way to
use your iPhone® in the car and stay focused
on the road. Use your Uconnect Touchscreen
display, the vehicle's knobs and controls,
and your voice with Siri to get access to
Apple® Music, Maps, Messages, and more.
To use Apple CarPlay®, make sure you are
using iPhone® 5 or later, have Siri enabled
in Settings, that your iPhone® is unlocked
for the very first connection only, and then
use the following procedure:
1. Connect your iPhone® to one of the
media USB ports in your vehicle.
NOTE:
Be sure to use the factory-provided Lightning
cable that came with your phone, as
after-market cables may not work.
2. Once the device is connected and recog -
nized, Apple CarPlay® should automati -
cally launch, but you can also launch it
by touching the Apple CarPlay® icon on
the touchscreen, located under Apps. Apple CarPlay®
Once Apple CarPlay® is up and running on
your Uconnect system, the following features
can be utilized using your iPhone’s® data
plan:
Phone
Music
Messages
Maps
NOTE:
To use Apple CarPlay®, make sure that
cellular data is turned on and that you are in
an area with cellular coverage. Your data and
cellular coverage is shown on the left side of
the radio screen.
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