2020 JEEP WRANGLER UNLIMITED battery

155
To Start The Engine While In Autostop
Mode
While in a forward gear, the engine will start
when the brake pedal is released or the
throttle pedal is depressed. The transmission
will automatically re-engage upon engine
restart.
Conditions That Will Cause The Engine To Start
Automatically While In Autostop Mode:
The transmission selector is moved out of
DRIVE.
To maintain cabin temperature comfort.
Actual cabin temperature is significantly
different than temperature set on Auto
HVAC.
HVAC is set to full defrost mode.
HVAC system temperature or fan speed is
manually adjusted.
Battery voltage drops too low.
Low brake vacuum (e.g. after several brake
pedal applications).
Stop/Start OFF switch is pushed.
A Stop/Start system error occurs.
STOP/START AUTO STOP ACTIVE time
exceeds 5 minutes.
4WD system is put into 4L or Neutral
mode.
Steering wheel is turned beyond
threshold. (ESS Models Only)
To Manually Turn Off The Stop/Start
System
1. Push the Stop/Start OFF switch (located
on the switch bank). The light on the
switch will illuminate.
Stop/Start OFF switch
2. The “STOP/START OFF” message will appear in instrument cluster display
within the Stop/Start section. Refer to
“Instrument Cluster” in “Getting To Know Your Instrument Panel” in your
Owner’s Manual for further information.
3. At the next vehicle stop (after turning off the Stop/Start system), the engine will
not be stopped.
4. The Stop/Start system will reset itself back to an ON condition every time the
ignition is turned off and back on.To Manually Turn On The Stop/Start
System
Push the Stop/Start OFF switch (located on
the switch bank). The light on the switch will
turn off.

For complete details on the Stop/Start System
refer to the “Stop/Start System” in the
“Starting And Operating” section located in
your Owner’s Manual for further information.

System Malfunction
If there is a malfunction in the Stop/Start
system, the system will not shut down the
engine. A “SERVICE STOP/START SYSTEM”
message will appear in the instrument
cluster display. Refer to “Instrument Cluster
Display“ in “Getting to Know Your Instru -
ment Panel” for further information.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 155

STARTING AND OPERATING
176
(Continued)
(Continued)
RECREATIONAL TOWING (BEHIND MOTORHOME, ETC.)
Towing This Vehicle Behind Another Vehicle
Recreational Towing — Four-Wheel Drive
Models
NOTE:
The transfer case must be shifted into
NEUTRAL (N), transmission must be in
PARK, for recreational towing.
Towing Condition Wheels OFF the Ground Four-Wheel Drive Models
Flat TowNONESee Instructions
Automatic transmission in PARK.
Transfer case in NEUTRAL (N).
Disconnect negative battery cable.
Tow in forward direction.
Dolly Tow Front NOT ALLOWED
Rear NOT ALLOWED
On Trailer ALL OK
NOTE:
When towing your vehicle, always follow applicable laws. Contact local authorities for additional details.
CAUTION!
DO NOT dolly tow any 4WD vehicle.
Towing with only one set of wheels on
the ground (front or rear) will cause
severe transmission and/or transfer case
damage. Tow with all four wheels either
ON the ground, or OFF the ground (using
a vehicle trailer).Tow only in the forward direction. Towing
this vehicle backwards can cause severe
damage to the transfer case.
Automatic transmissions must be placed
in PARK for recreational towing.
CAUTION! (Continued)
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 176

STARTING AND OPERATING
178
12. Shift the transmission into PARK (NOT inNEUTRAL).
13. Attach the vehicle to the tow vehicle using a suitable tow bar.
14. Release the parking brake.
15. Disconnect the negative battery cable, and secure it away from the negative
battery post.Shifting Out of NEUTRAL (N)
Use the following procedure to prepare your
vehicle for normal usage.
1. Bring the vehicle to a complete stop,leaving it connected to the tow vehicle.
2. Firmly apply the parking brake.
3. Reconnect the negative battery cable.
4. Start the engine.
5. Press and hold the brake pedal.
6. Shift the transmission into NEUTRAL.
7. Turn the engine OFF.
8. Shift the transfer case lever to the desired position.
NOTE:
When shifting the transfer case out of
NEUTRAL (N), the engine should remain Off
to avoid gear clash. 9. Shift the transmission into PARK.
10. Release the brake pedal.
11. Disconnect vehicle from the tow vehicle.
12. Start the engine.
13. Press and hold the brake pedal.
14. Release the parking brake.
15. Shift the transmission into gear, release
the brake pedal, and check that the
vehicle operates normally.
CAUTION!
Damage to the transmission may occur if
the transmission is shifted into PARK with
the transfer case in NEUTRAL (N) and the
engine running. With the transfer case in
NEUTRAL (N) ensure that the engine is
OFF before shifting the transmission into
PARK.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 178

179
IN CASE OF EMERGENCY
HAZARD WARNING
FLASHERS
The Hazard Warning flasher switch is located
on the instrument panel below the climate
controls.Push the switch to turn on the
Hazard Warning flasher. When the
switch is activated, all directional turn signals will flash on and off to warn
oncoming traffic of an emergency. Push the
switch a second time to turn off the Hazard
Warning flashers.
This is an emergency warning system and it
should not be used when the vehicle is in
motion. Use it when your vehicle is disabled
and it is creating a safety hazard for other
motorists. When you must leave the vehicle to seek
assistance, the Hazard Warning flashers will
continue to operate even though the ignition
is placed in the OFF position.
NOTE:
With extended use the Hazard Warning
flashers may wear down your battery.
BULB REPLACEMENT
Replacement Bulbs
Interior Bulbs
Bulb Name Bulb Number
Automatic Transmission Indicator Lamp 658
Heater Control Lamps (2) 194
Rocker Switch Indicator Lamp (Rear Window Defogger, and Rear
Wash/Wipe) **
Soundbar Dome Lamp 912
** Bulbs only available from an authorized dealer.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 179

183
(Continued)
Center High Mounted Stop Lamp (CHMSL)
Please see an authorized dealer for service.
License Plate Lamps
1. Reach under the vehicle to access theback of the lamp.
2. Firmly grasp the bulb by the two latch features and squeeze them together to
unlock the bulb from the back of the
lamp housing.
Rear Fog Lamp
NOTE:
We advise referring to an authorized dealer
for service.
1. Reach under the vehicle to access theback of the fog lamp.
2. Disconnect the wire harness connector from the fog lamp connector receptacle.
3. Rotate the socket a quarter turn counter -
clockwise, then remove it from the
housing.
4. Pull the bulb straight out from the keyed opening in the housing and then connect
the replacement bulb and reassemble.
FUSES
General Information
The fuses protect electrical systems against
excessive current.
When a device does not work, you must
check the fuse element inside the blade fuse
for a break/melt.
Also, please be aware that when using power
outlets for extended periods of time with the
engine off may result in vehicle battery
discharge.
CAUTION!
Do not touch the new bulb with your
fingers. Oil contamination will severely
shorten bulb life. If the bulb comes in
contact with any oily surface, clean the
bulb with rubbing alcohol.
WARNING!
When replacing a blown fuse, always use
an appropriate replacement fuse with
the same amp rating as the original fuse.
Never replace a fuse with another fuse of
higher amp rating. Never replace a blown
fuse with metal wires or any other mate-
rial. Failure to use proper fuses may
result in serious personal injury, fire and/
or property damage.
Before replacing a fuse, make sure that
the ignition is off and that all the other
services are switched off and/or disen -
gaged.
If the replaced fuse blows again, contact
an authorized dealer.
If a general protection fuse for safety
systems (air bag system, braking
system), power unit systems (engine
system, gearbox system) or steering
system blows, contact an authorized
dealer.
CAUTION!
If it is necessary to wash the engine
compartment, take care not to directly hit
the fuse box, and the windshield wiper
motors with water.
WARNING! (Continued)
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 183

IN CASE OF EMERGENCY
184
Power Distribution Center (PDC)
The Power Distribution Center (PDC) is
located in the engine compartment near the
battery. This center contains cartridge fuses,
mini fuses, and relays. The PDC top cover is
labeled with each serviceable fuse/relay loca-
tion, function, and size. NOTE:
Fuses for safety systems (marked with *)
must be serviced by an authorized dealer.
Power Distribution Center
CavityCartridge Fuse Micro Fuse Description
F01– –Spare
F02 40 Amp Green –Starter
(*)
F03 –5 Amp Tan Intelligent Battery Sensor (IBS)
(*)
F04 –20 Amp Yellow Fuel Pump MTR/FPCM
(*)
F05 –5 Amp Tan Security Gateway

(*)
F06 – –Spare
F07 –15 Amp Blue Low Temp Radiator Cooling Pump (LTR) — If Equipped
(*)
F08 –15 Amp Blue Trans Control Module TCM-8HP CYGNUS
(*)
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 184

189
F69–5 Amp Tan Motor Generator Unit MGU Belt Starter Generator (BSG) — If
Equipped
(*)
F70 –25 Amp Clear INJ/IGN COIL (GAS)/GLO PLUG MOD (DSL)
(*)
F71 – –Spare
F72 –10 Amp Red HD ELEC ACC PKG — If Equipped
(*)
F73 20 Amp Blue –PWR TOP LT
(*)
F74 20 Amp Blue –PWR TOP RT
(*)
F75 –10 Amp Red Power Pack Unit - Battery Pack Control Module & Auxiliary
Power Module (PPU-BPCM & APM) Belt Starter Generator
(BSG) — If Equipped
(*)
F76 –20 Amp Yellow ECM (GAS)/PCM (DSL)
(*)
F77 –10 Amp Red HTD MIRRORS
F78 –10 Amp Red COMP/INTRUSION/SIREN/INTRUSION SENSORS
F79 –20 Amp Yellow SMART BAR CTRL MOD
(*)
F80 –15 Amp Blue Powertrain Control Module (PCM)
(*)
F81 30 Amp Pink –REAR DEFROSTER (EBL)
Cavity Cartridge Fuse Micro Fuse Description
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 189

201
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 improp-
erly, so please follow the procedures in this
section carefully.
NOTE:
When using a portable battery booster pack,
follow the manufacturer's operating instruc -
tions and precautions.
Preparations For Jump Start
The battery in your vehicle is located in the
left rear of the engine compartment.
Positive Battery Post
Positive Battery Post NOTE:
The positive battery post is covered with a
protective cap. Lift up on the cap to gain
access to the post.
WARNING!
Do not attempt jump starting if the battery
is frozen. It could rupture or explode and
cause personal injury.
CAUTION!
Do not use a portable battery booster pack
or any other booster source with a system
voltage greater than 12 Volts or damage to
the battery, starter motor, alternator or
electrical system may occur.
WARNING!
Take care to avoid the radiator cooling
fan whenever the hood is raised. It can
start anytime the ignition switch is ON.
You can be injured by moving fan blades.
Remove any metal jewelry such as rings,
watch bands and bracelets that could
make an inadvertent electrical contact.
You could be seriously injured.
Batteries contain sulfuric acid that can
burn your skin or eyes and generate
hydrogen gas which is flammable and
explosive. Keep open flames or sparks
away from the battery.
2020_JEEP_JL_WRANGLER_UG_RHD_UK.book Page 201