2003 JEEP GRAND CHEROKEE Information

8W-18 BUS COMMUNICATIONS
Component Page
Adjustable Pedals Module.............. 8W-18-2
Airbag Control Module.............. 8W-18-4, 7
Automatic Zone Control Module....... 8W-18-4, 7
Body Control Module......... 8W-18-4, 7, 8, 9, 10
Compact Disc Changer.............. 8W-18-3, 5
Controller Antilock Brake.......... 8W-18-2, 3, 5
Data Link Connector......... 8W-18-4, 7, 8, 9, 10
Diagnostic Junction Port...... 8W-18-4, 7, 8, 9, 10
Driver Door Module................ 8W-18-2, 5
Engine Control Module........... 8W-18-3, 5, 10
Fuse 17....................... 8W-18-8, 9, 10
G103......................... 8W-18-8, 9, 10
Instrument Cluster.......... 8W-18-4, 7, 8, 9, 10Component Page
Intrusion Transceiver Module......... 8W-18-2, 6
Junction Block.................. 8W-18-8, 9, 10
Passenger Door Module.............. 8W-18-3, 6
Power Amplifier................... 8W-18-3, 5
Powertrain Control Module....... 8W-18-3, 5, 8, 9
Radio............................ 8W-18-4, 7
Rain Sensor...................... 8W-18-2, 6
Seat Module...................... 8W-18-2, 5
Sentry Key Immobilizer Module....... 8W-18-4, 7
Shifter Assembly................... 8W-18-4, 7
Transmission Control Module . . 8W-18-3, 6, 8, 9, 10
Vehicle Information Center........... 8W-18-2, 6
WJ8W-18 BUS COMMUNICATIONS 8W - 18 - 1

8W-40 INSTRUMENT CLUSTER
Component Page
Airbag Control Module.............. 8W-40-4, 5
Body Control Module....... 8W-40-2, 4, 5, 6, 7, 10
Combination Flasher................. 8W-40-3
Controller Antilock Brake...... 8W-40-4, 5, 6, 7, 9
Data Link Connector.............. 8W-40-2, 4, 5
Diagnostic Junction Port . . 8W-40-4, 5, 6, 7, 8, 9, 10
Engine Control Module......... 8W-40-4, 5, 9, 10
Fuse 17............................ 8W-40-2Component Page
Fuse 22.......................... 8W-40-2, 3
G200............................ 8W-40-2, 3
Instrument Cluster . . 8W-40-2, 3, 4, 5, 6, 7, 8, 9, 10
Junction Block.................... 8W-40-2, 3
Park Brake Switch................. 8W-40-6, 7
Powertrain Control Module . . 8W-40-4, 5, 6, 7, 8, 10
Transmission Control Module........... 8W-40-4
Vehicle Information Center............. 8W-40-7
WJ8W-40 INSTRUMENT CLUSTER 8W - 40 - 1

8W-49 OVERHEAD CONSOLE
Component Page
Accessory Delay Relay................ 8W-49-6
Automatic Day/Night Mirror.......... 8W-49-4, 5
Back-Up Lamp Relay................. 8W-49-5
Diagnostic Junction Port........... 8W-49-2, 3, 6
Driver Power Mirror.................. 8W-49-4
Fuse 7............................. 8W-49-7
Fuse 8........................... 8W-49-2, 3
Fuse 22........................ 8W-49-2, 3, 4
Fuse 25............................ 8W-49-6
G106.............................. 8W-49-7Component Page
G301........................ 8W-49-2, 3, 5, 6
Intrusion Transceiver Module........... 8W-49-7
Junction Block............... 8W-49-2, 3, 4, 6, 7
Left Rear Lamp Assembly.............. 8W-49-5
Park/Neutral Position Switch........... 8W-49-5
Rain Sensor........................ 8W-49-6
Siren.............................. 8W-49-7
Transmission Solenoid/TRS Assembly..... 8W-49-5
Vehicle Information Center........... 8W-49-2, 3
WJ8W-49 OVERHEAD CONSOLE 8W - 49 - 1

8W-70 SPLICE INFORMATION
Component PageS100.............................8W-10-11, 12
S102.............................8W-30-21, 45
S104................................8W-15-4
S105...............................8W-30-20
S106.............................8W-10-19, 20
S107............................8W-70-2, 3, 4, 5
S109...............................8W-10-21
S110 ................................8W-70-2
S111................................8W-10-23
S112............................8W-70-2, 3, 4, 5
S113................................8W-31-13
S114 ................................8W-15-2
S115................................8W-10-17
S116................................8W-12-18
S118................................8W-10-22
S119 ..............................8W-31-9, 10
S120...............................8W-30-20
S121...............................8W-10-21
S122...............................8W-31-5, 6
S123.............................8W-10-19, 20
S123...............................8W-30-12
S124...............................8W-10-22
S125................................8W-30-6
S126...............................8W-30-23
S127...............................8W-10-27
S128.............................8W-10-19, 20
S130...............................8W-18-3, 5
S131...............................8W-70-6, 7
S132............................8W-15-9, 10, 11
S133............................8W-15-9, 10, 11
S134...............................8W-15-6, 7
S135...............................8W-10-18
S136...............................8W-10-18
S137...............................8W-10-31
S139................................8W-15-3
S140................................8W-15-7
S141................................8W-15-6
S142..............................8W-12-3, 32
S143..............................8W-12-5, 32
S145................................8W-70-6
S147...............................8W-30-51
S151................................8W-15-5
S152................................8W-15-8
S153...............................8W-12-14
S154...............................8W-12-33
S155...............................8W-12-33
S156...............................8W-12-14
S158................................8W-70-5
S160................................8W-30-11
S162...............................8W-10-26
S163..............................8W-12-7, 15
S165................................8W-51-9
S168...............................8W-10-26
S169...............................8W-30-47
S170...............................8W-30-44
S171...............................8W-30-36
S172...............................8W-30-36
S174................................8W-15-6
S175................................8W-21-2
S176...............................8W-10-26
S200...............................8W-63-12
S201...............................8W-15-15
S202...............................8W-44-10
S203...............................8W-15-14
S204...............................8W-12-22
S205...............................8W-15-15
S206...............................8W-12-22
S207...............................8W-12-16
S208................................8W-44-8
S209................................8W-12-11
S210...............................8W-18-4, 7
S211................................8W-15-13
S212................................8W-53-2
S213................................8W-33-5
S214................................8W-33-5
S215...............................8W-47-13
S216...............................8W-47-13
S217...............................8W-18-10Component PageS221................................8W-12-11
S222...............................8W-30-37
S223............................8W-18-8, 9, 10
S224.............................8W-15-17, 18
S300...............................8W-15-21
S301...............................8W-15-21
S302...............................8W-61-5, 6
S303...............................8W-61-5, 6
S304...............................8W-12-16
S305...............................8W-18-2, 6
S306...............................8W-12-27
S307...............................8W-15-19
S308...............................8W-12-36
S309...............................8W-12-12
S310...............................8W-51-7, 8
S311 ................................8W-51-5
S312...............................8W-18-2, 6
S313...............................8W-51-5, 6
S314................................8W-33-2
S315...............................8W-70-6, 7
S316...............................8W-12-18
S317................................8W-61-5
S318................................8W-61-5
S319...............................8W-12-21
S323................................8W-18-9
S324...............................8W-18-3, 5
S326.............................8W-12-12, 13
S327...............................8W-12-32
S328................................8W-51-7
S329...............................8W-15-17
S330...............................8W-15-16
S331.............................8W-15-17, 18
S332.............................8W-15-17, 18
S333................................8W-47-3
S334................................8W-12-11
S336...............................8W-15-16
S337...............................8W-12-25
S338...............................8W-15-16
S339...............................8W-61-5, 6
S340...............................8W-61-5, 6
S341.............................8W-15-17, 22
S342................................8W-12-9
S345...............................8W-15-19
S346...............................8W-12-16
S347...............................8W-12-30
S348...............................8W-12-24
S349...............................8W-12-23
S351................................8W-70-8
S352................................8W-63-8
S353................................8W-12-9
S355.............................8W-15-18, 21
S356.............................8W-15-21, 22
S357.............................8W-15-16, 18
S358...............................8W-15-22
S359................................8W-50-9
S360................................8W-47-4
S361................................8W-47-4
S362................................8W-47-4
S363................................8W-47-4
S364................................8W-18-5
S365................................8W-39-11
S366...............................8W-12-15
S367...............................8W-12-36
S368................................8W-47-3
S369.............................8W-15-21, 22
S370...............................8W-15-19
S400...............................8W-12-17
S401...............................8W-15-20
S402...............................8W-15-20
S403...............................8W-12-16
S404...............................8W-12-30
S405...............................8W-12-30
S406................................8W-54-6
S407................................8W-54-6
S408...............................8W-15-19
S410...............................8W-15-19
S411 .............................8W-12-12, 13
S412...............................8W-15-20
WJ8W-70 SPLICE INFORMATION 8W - 70 - 1

Component Page
RIGHT FRONT WHEEL SPEED
SENSOR....................... 8W-80-115
RIGHT HEADLAMP LEVELING MOTOR
(BUILT-UP-EXPORT)............. 8W-80-115
RIGHT HIGH BEAM HEADLAMP..... 8W-80-116
RIGHT INSTRUMENT PANEL
SPEAKER...................... 8W-80-116
RIGHT LIFTGATE AJAR SWITCH..... 8W-80-116
RIGHT LOW BEAM HEADLAMP..... 8W-80-116
RIGHT MULTI-FUNCTION SWITCH . . . 8W-80-116
RIGHT REAR DOOR LOCK
MOTOR/AJAR SWITCH........... 8W-80-117
RIGHT REAR DOOR SPEAKER....... 8W-80-117
RIGHT REAR LAMP ASSEMBLY...... 8W-80-117
RIGHT REAR WHEEL SPEED
SENSOR....................... 8W-80-117
RIGHT REMOTE RADIO SWITCH.... 8W-80-117
RIGHT SIDE REPEATER LAMP
(BUILT-UP-EXPORT)............. 8W-80-118
RIGHT VISOR/VANITY LAMP........ 8W-80-118
SEAT BELT SWITCH............... 8W-80-118
SEAT MODULE C1 (PREMIUM)...... 8W-80-118
SEAT MODULE C2 (PREMIUM)...... 8W-80-119
SENTRY KEY IMMOBILIZER
MODULE...................... 8W-80-119
SHIFTER ASSEMBLY
(C201 DIESEL).................. 8W-80-119
SHIFTER ASSEMBLY (GAS)......... 8W-80-120
SHIFTER ASSEMBLY C1 (DIESEL).... 8W-80-120
SHIFTER ASSEMBLY C2 (DIESEL).... 8W-80-120
SIREN (BUILT-UP-EXPORT)......... 8W-80-120
SPEED CONTROL SWITCH NO. 1.... 8W-80-120
SPEED CONTROL SWITCH NO. 2.... 8W-80-121
SUNROOF CONTROL MODULE...... 8W-80-121
SUNROOF MOTOR C1.............. 8W-80-121
SUNROOF MOTOR C2.............. 8W-80-121
SUNROOF SWITCH................ 8W-80-121Component Page
TEMPERATURE VALVE
ACTUATOR (MTC)............... 8W-80-122
THROTTLE POSITION
SENSOR (4.0L).................. 8W-80-122
THROTTLE POSITION
SENSOR (4.7L).................. 8W-80-122
TRAILER TOW BRAKE
LAMP RELAY................... 8W-80-122
TRAILER TOW CIRCUIT
BREAKER...................... 8W-80-122
TRAILER TOW CONNECTOR........ 8W-80-123
TRAILER TOW LEFT TURN
RELAY........................ 8W-80-123
TRAILER TOW RIGHT TURN
RELAY........................ 8W-80-123
TRANSFER CASE POSITION
SENSOR....................... 8W-80-123
TRANSMISSION CONTROL
MODULE (4.7L)................. 8W-80-124
TRANSMISSION CONTROL
MODULE C1 (DIESEL)........... 8W-80-125
TRANSMISSION CONTROL
MODULE C2 (DIESEL)........... 8W-80-125
TRANSMISSION SOLENOID (4.0L).... 8W-80-125
TRANSMISSION SOLENOID
ASSEMBLY (DIESEL)............ 8W-80-126
TRANSMISSION SOLENOID/TRS
ASSEMBLY (4.7L)................ 8W-80-126
UNDERHOOD LAMP............... 8W-80-126
VEHICLE INFORMATION CENTER . . . 8W-80-127
VISCOUS/CABIN HEATER
(DIESEL)...................... 8W-80-127
WASHER FLUID LEVEL SWITCH.... 8W-80-127
WASTEGATE SOLENOID
(DIESEL)...................... 8W-80-127
WATER IN FUEL SENSOR
(DIESEL)...................... 8W-80-127
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 5

VEHICLE INFORMATION CENTER - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1- -
2 D25 20YL/VT PCI BUS
3 F70 20PK FUSED B(+)
4 Z155 20BK/OR GROUND
5 G5 20DB/WT FUSED IGNITION SWITCH OUTPUT (RUN-START)
6- -
VISCOUS/CABIN HEATER (DIESEL) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 A82 16PK/LG VISCOUS/CABIN HEATER RELAY OUTPUT
2 Z18 16BK GROUND
WASHER FLUID LEVEL SWITCH - GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 V11 20BK/TN WASHER FLUID SWITCH SENSE
2 Z141 20BK GROUND
WASTEGATE SOLENOID (DIESEL)-2WAY
CAV CIRCUIT FUNCTION
1 F15 18DB/WT FUSED AUTO SHUT DOWN RELAY OUTPUT
2 Y42 18OR/DB WASTEGATE SOLENOID CONTROL
WATER IN FUEL SENSOR (DIESEL) - BLACK 3 WAY
CAV CIRCUIT FUNCTION
1 K4 20BK/LB SENSOR GROUND
2 G123 20DG/WT WATER IN FUEL SENSOR SIGNAL
3 F15 20RD/DG FUSED AUTO SHUT DOWN RELAY OUTPUT
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 127

CONNECTOR NAME/
NUMBERCOLOR LOCATION FIG.
Trailer Tow Brake Lamp Relay BK Left Quarter Panel N/S
Trailer Tow Circuit Breaker BK Left Quarter Panel N/S
Trailer Tow Connector BK In Rear Bumper 39
Trailer Tow Left Turn Relay BK Left Quarter Panel N/S
Trailer Tow Right Turn Relay BK Left Quarter Panel N/S
Transfer Case Position Sensor BK On Transfer Case 7
Transmission Control Module
(4.7L)BK Rear of Engine Compartment 14, 15, 18
Transmission Control Module
C1 (Diesel)BK Right Rear Side of Engine
CompartmentN/S
Transmission Control Module
C2 (Diesel)BK Right Rear Side of Engine
Compartment8
Transmission Solenoid (4.0L
Gas)BK Left Side of Transmission 12
Transmission Solenoid
Assembly (Diesel)BK On Transmission 8
Transmission Solenoid/TRS
Assembly (4.7L)GY Left Side of Transmission 16
Underhood Lamp BK At Lamp 6
Vehicle Information Center BK In Overhead Console N/S
Viscous/Cabin Heater (Diesel) BK Left Rear of Engine Compartment N/S
Washer Fluid Level Switch GY Left Front of Engine Compartment 3, 4
Wastegate Solenoid (Diesel) Near Power Distribution Center N/S
Water In Fuel Sensor (Diesel) BK Left Rear of Engine Compartment N/S
GROUNDS
GROUND NUMBER LOCATION FIG.
G100 (4.0L and Diesel) Near Starter N/S
G100 (4.7L) Near Intake Plenum N/S
G101 Near Battery 2
G102 Right Side of Engine 14, 15
G103 Right Side of Engine 7, 8, 10, 11, 14, 15
G104 (4.0L) Right Rear of Engine 10, 11
G104 (4.7L) Left Side of Engine 13
G105 Right Side of Engine 8
G106 Left Side of Engine Compartment 3, 4
G107 Left Side of Engine Compartment 3, 4
G108 Near Power Distribution Center 5
G200 Near Airbag Control Module 19, 20, 21, 22
G201 Near Airbag Control Module 19, 20, 21, 22
G300 Near Right Front Seat 34, 36
G301 Near Left Front Seat 33, 35
WJ8W-91 CONNECTOR/GROUND/SPLICE LOCATION 8W - 91 - 11
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

8W-97 POWER DISTRIBUTION
TABLE OF CONTENTS
page page
POWER DISTRIBUTION
DESCRIPTION..........................1
OPERATION............................1
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS.........2
CIGAR LIGHTER OUTLET
DESCRIPTION..........................2
OPERATION............................2
DIAGNOSIS AND TESTING - CIGAR LIGHTER
OUTLET.............................2
CIGAR LIGHTER OUTLET DOOR SPRING
REMOVAL.............................3
INSTALLATION..........................3
IOD FUSE
DESCRIPTION..........................3
OPERATION............................4
REMOVAL.............................4
INSTALLATION..........................4
JUNCTION BLOCK
DESCRIPTION..........................5
OPERATION............................5
REMOVAL.............................5
INSTALLATION..........................6
POWER DISTRIBUTION CENTER
DESCRIPTION..........................7
OPERATION............................8
REMOVAL.............................8
DISASSEMBLY
POWER DISTRIBUTION CENTER
DISASSEMBLY........................9ASSEMBLY
POWER DISTRIBUTION CENTER
ASSEMBLY..........................11
INSTALLATION.........................12
POWER OUTLET
DESCRIPTION - FRONT POWER OUTLET....12
OPERATION - FRONT POWER OUTLET......12
DIAGNOSIS AND TESTING - POWER OUTLET . 12
REMOVAL.............................13
INSTALLATION.........................13
POWER OUTLET RELAY
DESCRIPTION.........................13
OPERATION...........................14
DIAGNOSIS AND TESTING - POWER OUTLET
RELAY..............................14
REMOVAL.............................15
INSTALLATION.........................15
IOD WIRE HARNESS CONNECTOR
DESCRIPTION.........................15
OPERATION...........................15
FUSE COVER
REMOVAL.............................16
INSTALLATION.........................16
REAR POWER OUTLET
DESCRIPTION - REAR POWER OUTLET.....16
OPERATION - REAR POWER OUTLET.......17
DIAGNOSIS AND TESTING - REAR POWER
OUTLET............................17
REMOVAL.............................17
INSTALLATION.........................18
POWER DISTRIBUTION
DESCRIPTION
This group covers the various standard and
optional power distribution components used on this
model. The power distribution system for this vehicle
consists of the following components:
²Power Distribution Center (PDC)
²Junction Block (JB)
²Power Outlets
The power distribution system also incorporates
various types of circuit control and protection fea-
tures, including:
²Automatic resetting circuit breakers
²Blade-type fuses
²Bus bars
²Cartridge fuses²Circuit splice blocks
²Flashers
²Fusible links
²Standard and Micro-Relays
Following are general descriptions of the major
components in the power distribution system. See the
owner's manual in the vehicle glove box for more
information on the features and use of all of the
power distribution system components. Refer to Wir-
ing Diagrams for complete circuit diagrams.
OPERATION
The power distribution system for this vehicle is
designed to provide safe, reliable, and centralized dis-
tribution points for the electrical current required to
operate all of the standard and optional factory-in-
stalled electrical and electronic powertrain, chassis,
safety, security, comfort and convenience systems. At
WJ8W-97 POWER DISTRIBUTION 8W - 97 - 1