2013 JEEP WRANGLER ECU

Brake Master Cylinder
The fluid level in the master cylinders should be checked
whenever the vehicle is serviced. If necessary, add fluid
to bring level to the full level mark on the side of the
reservoir of the brake master cylinder. With disc brakes,
fluid level can be expected to fall as the brake pads wear.
If the brake fluid level is abnormally low, check system
for leaks.
Refer to “Fluids, Lubricants, and Genuine Parts” in
“Maintaining Your Vehicle” for further information.
WARNING!
•Use only manufacturer’s recommended brake fluid.
Refer to “Fluids, Lubricants, and Genuine Parts” in
“Maintaining Your Vehicle” for further information.
Using the wrong type of brake fluid can severely
(Continued)
WARNING! (Continued)
damage your brake system and/or impair its perfor-
mance. The proper type of brake fluid for your
vehicle is also identified on the original factory
installed hydraulic master 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
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 unexpectedly during hard or pro-
longed braking, resulting in sudden brake failure.
This could result in a collision.
(Continued)
7
MAINTAINING YOUR VEHICLE 593

ABS (Anti-Lock Brake System)................307
Adding Engine Coolant (Antifreeze) ............588
Adding Fuel ............................ .517
Additives, Fuel .......................... .515
Airbag ..................................62
Airbag Deployment ........................71
Airbag Light .............................73
Airbag Maintenance ........................72
Airbag, Side ..............................70
Air Cleaner, Engine (Engine Air Cleaner Filter) . . . .577
Air Conditioner Maintenance .................579
Air Conditioning ......................... .395
Air Conditioning Controls ...................395
Air Conditioning Filter .....................407
Air Conditioning, Operating Tips ..............408
Air Conditioning Refrigerant .................579
Air Conditioning System ....................395
Air Pressure, Tires ........................ .489
Alarm Light ............................ .309Alarm (Security Alarm)
......................21
Alterations/Modifications, Vehicle ...............9
Antenna, Satellite Radio .....................357
Antifreeze (Engine Coolant) ..................588
Disposal ............................. .590
Anti-Lock Brake System (ABS) ................459
Anti-Lock Warning Light ....................307
Appearance Care ........................ .600
Arming Theft System (Security Alarm) ...........22
Assistance Towing ........................ .130
Auto Down Power Windows ..................44
Automatic Dimming Mirror ..................113
Automatic Door Locks ......................41
Automatic Headlights ..................... .170
Automatic Oil Change Indicator ...............329
Automatic Temperature Control (ATC) ..........399
Automatic Transaxle Interlock System .........................17
644 INDEX

Hazard Warning Flasher..................546
Headlights ........................... .169
Headlight Switch ...................... .169
High Beam ........................... .305
High Beam Indicator .....................305
Hill Descent Control Indicator ..............474
Illuminated Entry ........................23
Instrument Cluster ..................... .169
Interior ............................. .173
Lights On Reminder .....................171
Low Fuel ............................ .304
Oil Pressure .......................... .305
Passing ............................. .172
Rear Servicing ........................ .617
Rear Tail ............................ .617
Seat Belt Reminder ..................... .305
Security Alarm (Theft Alarm) ...............309
Service .............................. .615
Side Marker .......................... .617Theft Alarm (Security Alarm)
...............309
Tire Pressure Monitoring (TPMS) ............310
Traction Control ....................... .472
Turn Signal .......................... .103
Voltage ............................. .304
Warning (Instrument Cluster Description) ......304
Loading Vehicle ......................... .519
Tires ............................... .482
Locking Axle ........................... .438
Locks ..................................38
Automatic Door .........................41
Child Protection .........................42
Door .................................38
Power Door ............................40
Steering Wheel ..........................17
Lubrication, Body ........................ .582
Maintenance Free Battery ....................577
Maintenance Procedures ....................573
10
INDEX 653

Safety Checks Inside Vehicle.................101
Safety Checks Outside Vehicle ................103
Safety Defects, Reporting ....................637
Safety, Exhaust Gas ....................... .100
Safety Information, Tire .....................476
Safety Tips ............................. .100
Satellite Radio Antenna .....................357
Schedule, Maintenance .....................622
Seat Belt Maintenance ..................... .604
Seat Belt Reminder .........................60
Seat Belts ................................50
Adjustable Upper Shoulder Anchorage .........56
And Pregnant Women .....................61
Child Restraint ..........................75
Extender ..............................61
Front Seat .............................50
Inspection ........................... .101
Pretensioners ...........................60 Reminder
............................ .305
Untwisting Procedure .....................56
Seats ................................. .153
Adjustment .......................... .154
Easy Entry ........................... .156
Fold and Tumble Rear ....................163
Heated .............................. .160
Height Adjustment ..................... .155
Rear Folding ......................... .165
Removal ............................ .164
Seatback Release ....................... .156
Tilting .............................. .156
Security Against Theft .......................21
Security Alarm (Theft Alarm) ..................21
Sentry Key (Immobilizer) ....................18
Sentry Key Programming ....................20
Sentry Key Replacement .....................19
Service Assistance ........................ .633
10
INDEX 657