2003 JEEP GRAND CHEROKEE seats

8W-02 COMPONENT INDEX
Component Page
A/C Compressor Clutch................. 8W-42
A/C Pressure Transducer................ 8W-42
Accelerator Pedal Position Sensor......... 8W-30
Accessory Delay Relay.................. 8W-64
Adjustable Pedals..................... 8W-30
Airbags............................. 8W-43
Ambient Temperature Sensor............ 8W-45
Antennas............................ 8W-47
Ash Receiver Lamp.................... 8W-44
Auto Shut Down Relay................. 8W-30
Automatic Day/Night Mirror............. 8W-49
Automatic Headlamp Light Sensor/VTSS
LED.............................. 8W-39
Automatic Zone Control Module.......... 8W-42
Back-Up Lamp Relay................... 8W-51
Battery Temperature Sensor............. 8W-30
Battery............................. 8W-20
Blend Door Motor/Actuator.............. 8W-42
Blower Motor......................... 8W-42
Body Control Module................... 8W-45
Boost Pressure Sensor.................. 8W-30
Brake Lamp Switch.................... 8W-33
Camshaft Position Sensor............... 8W-30
Capacitors........................... 8W-30
Cargo Lamp.......................... 8W-44
Center High Mounted Stop Lamp......... 8W-51
Cigar Lighter......................... 8W-41
Circuit Breakers...................... 8W-12
Clockspring.................. 8W-33, 41, 43, 47
Coil On Plugs......................... 8W-30
Coil Rail............................. 8W-30
Combination Flasher................... 8W-52
Compact Disc Changer.................. 8W-47
Controller Antilock Brake............... 8W-35
Coolant Level Sensor................... 8W-45
Courtesy Lamps....................... 8W-44
Crankcase Heater..................... 8W-30
Crankshaft Position Sensor.............. 8W-30
Cylinder Lock Switches................. 8W-61
Data Link Connector................... 8W-18
Diagnostic Junction Port................ 8W-18
EGR Solenoid......................... 8W-30
Electric Brake........................ 8W-54
Electronic Speed Control Servo........... 8W-33
Engine Control Module................. 8W-30
Engine Coolant Temperature Sensor...... 8W-30
Engine Oil Pressure Sensor.............. 8W-30
Engine Starter Motor................... 8W-21
EVAP/Purge Solenoid................... 8W-30
Fog Lamps........................ 8W-50, 51
Fuel Injectors......................... 8W-30
Fuel Pressure Sensor................... 8W-30Component Page
Fuel Pressure Solenoid................. 8W-30
Fuel Pump........................... 8W-30
Fuel Tank Module..................... 8W-30
Fuses............................ 8W-10, 12
Fusible Link....................... 8W-10, 20
Grounds............................. 8W-15
Generator......................... 8W-20, 30
Glove Box Lamp...................... 8W-44
Glow Plugs........................... 8W-30
Headlamp Leveling Motor............... 8W-50
Heated Seats......................... 8W-63
High Beam Headlamps................. 8W-50
Hood Ajar Switch...................... 8W-39
Horns............................... 8W-41
Hydraulic Cooling Module............ 8W-30, 42
Idle Air Control Motor.................. 8W-30
Ignition Switch....................... 8W-10
Impact Sensors....................... 8W-43
Input Speed Sensor.................... 8W-31
Instrument Cluster.................... 8W-40
Intake Air Temperature Sensor........... 8W-30
Intake Port Swirl Actuator.............. 8W-30
Intrusion Transceiver Module............ 8W-49
Junction Block........................ 8W-12
Knock Sensor......................... 8W-30
Lamp Assemblies................... 8W-51, 52
Leak Detection Pump.................. 8W-30
License Lamps........................ 8W-51
Liftgate............................. 8W-61
Line Pressure Sensor................... 8W-31
Low Beam Headlamps.................. 8W-50
Low Beam Relay...................... 8W-50
Low Beam/Daytime Running Lamp Relay . . . 8W-50
Lumbar Motor........................ 8W-63
Lumbar Switch....................... 8W-63
Manifold Absolute Pressure Sensor........ 8W-30
Manual Temperature Control............. 8W-42
Mass Air Flow Sensor.................. 8W-30
Memory Set Switch................. 8W-62, 63
Mode Door Motor/Actuator............... 8W-42
Multi-Function Switch............... 8W-50, 53
Output Speed Sensor................... 8W-31
Overhead Map/Courtesy Lamp........... 8W-44
Oxygen Sensors....................... 8W-30
Park Brake Switch..................... 8W-40
Park Lamp........................... 8W-50
Park/Neutral Position Switch............ 8W-31
Park/Turn Signal Lamps................ 8W-50
Power Amplifier....................... 8W-47
Power Connector...................... 8W-41
Power Distribution Center............... 8W-10
Power Mirrors........................ 8W-62
WJ8W-02 COMPONENT INDEX 8W - 02 - 1

Component Page
Power Outlet......................... 8W-41
Power Seats.......................... 8W-63
Power Windows....................... 8W-60
Powertrain Control Module.............. 8W-30
Radio............................... 8W-47
Rain Sensor.......................... 8W-49
Recirculation Door Motor/Actuator........ 8W-42
Red Brake Warning Indicator Switch....... 8W-35
Remote Keyless Module................. 8W-39
Remote Radio Switches................. 8W-47
Splices.............................. 8W-10
Seat Belt Switch...................... 8W-43
Seat Module.......................... 8W-63
Sentry Key Immobilizer Module.......... 8W-39
Shifter Assembly...................... 8W-31
Side Impact Sensors................... 8W-43
Side Marker Lamps.................... 8W-50
Side Repeater Lamps................... 8W-52
Siren............................... 8W-49
Speakers............................ 8W-47Component Page
Speed Control Switches................. 8W-33
Sunroof............................. 8W-64
Temperature Valve Actuator............. 8W-42
Throttle Position Sensor................ 8W-30
Trailer Tow.......................... 8W-54
Transfer Case Position Sensor............ 8W-31
Transmission......................... 8W-31
Turn Signal Lamps.................... 8W-52
Underhood Lamp...................... 8W-44
Vehicle Information Center.............. 8W-49
Viscous/Cabin Heater................... 8W-30
Visor/Vanity Lamps.................... 8W-44
Washer Fluid Level Switch.............. 8W-53
Wastegate Solenoid.................... 8W-30
Water In Fuel Sensor................... 8W-30
Wheel Speed Sensors................... 8W-35
Window Defogger...................... 8W-48
Wiper High/Low Relay.................. 8W-53
Wiper Motor.......................... 8W-53
Washer Pump......................... 8W-5
8W - 02 - 2 8W-02 COMPONENT INDEXWJ

8W-63 POWER SEATS
Component Page
Body Control Module................ 8W-63-12
Circuit Breaker No. 2 (JB).... 8W-63-2, 3, 4, 10, 11
Driver Door Module.................. 8W-63-3
Driver Heated Seat Back............ 8W-63-6, 7
Driver Heated Seat Cushion.......... 8W-63-6, 7
Driver Heated Seat Switch............ 8W-63-12
Driver Lumbar Motor............. 8W-63-10, 11
Driver Lumbar Switch............. 8W-63-10, 11
Driver Power Seat Front Riser Motor . . . 8W-63-2, 5
Driver Power Seat Front Riser
Motor Sensor..................... 8W-63-8
Driver Power Seat Horizontal Motor.... 8W-63-2, 5
Driver Power Seat Horizontal
Motor Sensor.................... 8W-63-8, 9
Driver Power Seat Rear Riser Motor . . . 8W-63-2, 5
Driver Power Seat Rear Riser
Motor Sensor..................... 8W-63-8
Driver Power Seat Recliner Motor..... 8W-63-2, 5
Driver Power Seat Recliner
Motor Sensor.................... 8W-63-8, 9Component Page
Driver Power Seat Switch............ 8W-63-2, 5
Fuse 20........................... 8W-63-12
G200............................. 8W-63-12
G300.................... 8W-63-3, 4, 5, 10, 11
G301.................. 8W-63-2, 3, 4, 5, 10, 11
Junction Block.......... 8W-63-2, 3, 4, 10, 11, 12
Memory Set Switch................... 8W-63-3
Passenger Heated Seat Back......... 8W-63-6, 7
Passenger Heated Seat Cushion....... 8W-63-6, 7
Passenger Heated Seat Switch......... 8W-63-12
Passenger Lumbar Motor.......... 8W-63-10, 11
Passenger Lumbar Switch.......... 8W-63-10, 11
Passenger Power Seat Front
Riser Motor....................... 8W-63-4
Passenger Power Seat Horizontal Motor . . . 8W-63-4
Passenger Power Seat Rear
Riser Motor....................... 8W-63-4
Passenger Power Seat Recliner Motor.... 8W-63-4
Passenger Power Seat Switch........... 8W-63-4
Seat Module.............. 8W-63-3, 5, 6, 7, 8, 9
WJ8W-63 POWER SEATS 8W - 63 - 1

C300 (LHD) - GRAY (LEFT BODY SIDE)
CAV CIRCUIT
A P130 16DG/WT (HEATED SEATS)
B Q13 16DB
C B40 14LB
D F9 14RD/BK (EXCEPT BASE))
E P144 16BK/VT (HEATED SEATS)
F A141 16DG/BK (EXCEPT DIESEL)
G-
H-
J-
K-
L Q23 16RD/WT
M-
1 D25 20YL/VT
2 V13 18BR/LG
3 V22 18BR/YL
4 P112 20YL/WT
5 P114 20YL/RD
6 P35 18OR/VT
7 P36 18PK/VT
8 L50 18WT/TN
9 B1 18YL/DB
10 B2 18YL
11 B3 18LG/DB
12 B4 18LG
13 -
14 -
15 -
16 P29 20BR/WT (HEATED SEATS)
17 P86 18PK/BK (HEATED SEATS)
18 E21 20OR/RD
19 K4 20BK/LB
20 K226 20LB/YL
21 L62 18BR/RD
22 L95 18DG/YL (BUILT-UP-EXPORT)
23 -
24 L1 18VT/BK
25 -
26 -
27 -
28 -
29 -
30 -
31 -
32 -
8W - 80 - 44 8W-80 CONNECTOR PIN-OUTWJ

C303 - WHITE (REAR DOOR SIDE)
CAV CIRCUIT
1 X58 18TN/DG (BASE)
1 X55
1 X92 18TN/DG (PREMIUM)
2 X52 18WT/VT (BASE)
2 X90 18WT/VT (PREMIUM)
3 E21 20OR/RD
4 P35 18OR/VT
5 P36 18PK/VT
6-
7-
8 Q14 16GY
9 Q24 16DG
10 Z1 16BK
11 G76 18TN/YL
C304 - BLACK (BODY SIDE)
CAV CIRCUIT
1 P86 20PK/BK (RHD)
1 P86 18PK/BK (LHD)
2 P130 16DG/WT
3 D25 20YL/VT
4 F37 16RD/LB (RHD)
4 F37 16RD (LHD)
5 Z238 16BK (RHD)
5 Z243 16BK (LHD)
6 P29 20BR/WT
7 Z155 18BK/OR (RHD)
7 Z155 20BK/OR (LHD)
8 Z5 16BK/VT (RHD)
8 P144 16BK/VT (LHD)
9-
10 -
C304 - BLACK (POWER SEAT SIDE)
CAV CIRCUIT
1 P86 20DG/YL (HEATED SEATS)
2 P130 16DG/WT (HEATED SEATS)
3 D25 20VT/YL (PREMIUM POWER
SEATS)
4 F35 16RD
5 Z1 16BK
6 P29 20BR/WT (HEATED SEATS)
7 Z2 20BK/OR (PREMIUM POWER SEATS)
8 Z5 16BK/VT (HEATED SEATS)
9-
10 -
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 51

C306 - BLACK (BODY SIDE)
CAV CIRCUIT
1 P130 16DG/WT
2 Z238 16BK
3 F37 16RD/LB
4 P86 20PK/BK
5 P29 20BR/WT
6 P144 16BK/LG
C306 - BLACK (POWER SEAT SIDE)
CAV CIRCUIT
1 P130 16DG/WT (HEATED SEATS)
2 Z1 16BK
3 F37 16RD/LB
4 P86 20DG/YL (HEATED SEATS)
5 P29 20BR/WT (HEATED SEATS)
6 Z5 16BK/VT (HEATED SEATS)
C307 - WHITE (BODY SIDE)
CAV CIRCUIT
1 X93 18DG/WT (RHD)
1 X91 18WT/DG (LHD)
2 X93 18DG/WT (LHD)
2 X91 18WT/DG (RHD)
3 E20 20OR/DB (RHD)
3 E21 20OR/RD (LHD)
4 P35 18OR/VT
5 P36 18PK/VT
6-
7-
8 Q13 16DB (LHD)
8 Q14 16GY (RHD)
9 Q24 16DG (RHD)
9 Q23 16RD/TN (LHD)
10 Z243 16BK
11 G77 20TN/OR
C307 - WHITE (REAR DOOR SIDE)
CAV CIRCUIT
1 X57 18TN/DG (BASE)
1 X93 18TN/DG (PREMIUM)
2 X51 18WT/VT (BASE)
2 X91 18WT/VT (PREMIUM)
3 E21 20OR/RD
4 P35 18OR/VT
5 P36 18PK/VT
6-
7-
8 Q14 16GY
9 Q24 16DG
10 Z1 16BK
11 G76 18TN/YL
8W - 80 - 52 8W-80 CONNECTOR PIN-OUTWJ

CONNECTOR NAME/
NUMBERCOLOR LOCATION FIG.
Right Front Park/Turn Signal
Lamp (Except Built-Up-Export)BK At Lamp N/S
Right Front Side Marker Lamp
(Except Built-Up-Export)WT At Lamp N/S
Right Front Turn Signal Lamp
(Built-Up-Export)WT At Lamp N/S
Right Front Wheel Speed
SensorGY In Right Front Wheel Opening N/S
Right Headlamp Leveling
Motor (Built-Up-Export)BK At Motor N/S
Right High Beam Headlamp BK At Lamp N/S
Right Instrument Panel
SpeakerWT At Speaker 19, 20
Right Liftgate Ajar Switch BK In Liftgate 38
Right Low Beam Headlamp GY At Lamp N/S
Right Multi-Function Switch WT On Steering Column 23
Right Rear Door Lock
Motor/Ajar SwitchBK In Right Rear Door 29
Right Rear Door Speaker WT In Right Rear Door 29
Right Rear Lamp Assembly BK At Lamp Assembly 37
Right Rear Wheel Speed
SensorBK Near Right Rear Wheel 33, 35
Right Remote Radio Switch BK At Switch in Steering Wheel N/S
Right Side Repeater Lamp
(Built-Up-Export)BK On Right Front Fender 5
Right Visor/Vanity Lamp BK At Lamp N/S
Seat Belt Switch WT At Driver Seat N/S
Seat Module - C1 (Premium) BK Under Driver Seat N/S
Seat Module - C2 (Premium) OR Under Driver Seat N/S
Sentry Key Immobilizer Module BK On Steering Column 23
Shifter Assembly (Gas) WT Between Front Seats 23
Shifter Assembly C1 (Diesel) Between Front Seats N/S
Shifter Assembly C2 (Diesel) Between Front Seats N/S
Siren (Built-up-export) Left Front Fender 3, 4
Speed Control Switch NO. 1 BK On Steering Wheel N/S
Speed Control Switch NO. 2 BK On Steering Wheel N/S
Sunroof Control Module At Sunroof 32
Sunroof Motor C1 WT At Sunroof N/S
Sunroof Motor C2 BK In Overhead N/S
Sunroof Switch GY At Switch N/S
Temperature Valve Actuator
(MTC)BK On HVAC Housing N/S
Throttle Position Sensor (4.0L) BK Left Side of Engine 9
Throttle Position Sensor (4.7L) WT Left Side of Engine 13
8W - 91 - 10 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONWJ
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

ENGINE
TABLE OF CONTENTS
page page
ENGINE - 4.0L............................ 1ENGINE - 4.7L........................... 61
ENGINE - 4.0L
TABLE OF CONTENTS
page page
ENGINE - 4.0L
DESCRIPTION..........................2
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION............3
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - PERFORMANCE............4
DIAGNOSIS AND TESTINGÐ ENGINE
DIAGNOSIS - MECHANICAL..............6
DIAGNOSIS AND TESTINGÐCYLINDER
COMPRESSION PRESSURE..............8
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE.......8
DIAGNOSIS AND TESTINGÐREAR SEAL
AREA LEAKS..........................9
STANDARD PROCEDURE
STANDARD PROCEDURE - FORM-IN-
PLACE GASKETS AND SEALERS..........9
STANDARD PROCEDURE - REPAIR
DAMAGED OR WORN THREADS.........10
STANDARD PROCEDUREÐHYDROSTATIC
LOCK...............................10
STANDARD PROCEDURE - CYLINDER
BORE HONING.......................10
STANDARD PROCEDURE - ENGINE CORE
AND OIL GALLERY PLUGS..............11
REMOVAL.............................11
INSTALLATION.........................13
SPECIFICATIONS
ENGINE - 4.0L........................14
TORQUE - 4.0L ENGINE................17
AIR CLEANER ELEMENT
REMOVAL - 4.0L........................18
INSTALLATION - 4.0L....................19
AIR CLEANER HOUSING
REMOVAL - 4.0L........................19
INSTALLATION - 4.0L....................19CYLINDER HEAD
DESCRIPTION.........................19
REMOVAL.............................19
CLEANING............................21
INSPECTION..........................21
INSTALLATION.........................21
CYLINDER HEAD COVER(S)
DESCRIPTION.........................22
REMOVAL.............................22
CLEANING............................23
INSPECTION..........................23
INSTALLATION.........................23
INTAKE/EXHAUST VALVES & SEATS
DESCRIPTION.........................23
STANDARD PROCEDURE - VALVE SERVICE . . 23
REMOVAL.............................25
INSTALLATION.........................25
ROCKER ARM / ADJUSTER ASSEMBLY
DESCRIPTION.........................26
OPERATION...........................26
REMOVAL.............................26
CLEANING............................26
INSPECTION..........................27
INSTALLATION.........................27
VALVE STEM SEALS
DESCRIPTION.........................27
VALVE SPRINGS
DESCRIPTION.........................28
STANDARD PROCEDURE - VALVE SPRING
TENSION TEST.......................28
REMOVAL.............................28
INSTALLATION.........................29
ENGINE BLOCK
CLEANING............................30
INSPECTION..........................30
CAMSHAFT & BEARINGS
DESCRIPTION.........................30
WJENGINE 9 - 1