2002 JEEP GRAND CHEROKEE Heated seats

²Ten-way power drivers and passenger seats
with Memory- This power seat option is standard
on Overland models and optional on Limited models.
This option includes a six-way adjustable seat cush-
ion track with power seat back recliners and power
lumbar supports. Heated Seats are standard with
this option.
Refer toHeated Seat Systemfor more informa-
tion on the heated seat option. Refer toMemory
Systemin the Memory System section of this group
for more information on the memory system.
The power seat system includes the following com-
ponents:
²Power lumbar adjuster (ten-way power seat
only)
²Power lumbar switch (ten-way power seat only)
²Power seat recliner (ten-way power seat only)
²Power seat switch
²Power seat track.
Refer toPower Seatin Wiring Diagrams for com-
plete circuit diagrams. Following are general descrip-
tions of the major components in the power seat/
memory seat system.
DESCRIPTION - MEMORY SYSTEM
An electronic memory system is standard equip-
ment on the Limited model. The memory system is
able to store and recall the driver side power seat
positions (including the power recliner position), and
both outside power mirror positions for two drivers.
For vehicles with a radio connected to the Program-
mable Communications Interface (PCI) data bus net-
work, the memory system is also able to store and
recall up to twenty - ten AM and ten FM - radio sta-
tion presets for two drivers. The memory system also
will store and recall the last station listened to for
each driver, even if it is not one of the twenty preset
stations.
The memory system will automatically return to
all of these settings when the corresponding num-
bered and color-coded button (Driver 1 - Black, or
Driver 2 - Gray) of the memory switch on the driver
side front door trim panel is depressed, or when the
doors are unlocked using the corresponding num-
bered and color-coded (Driver 1 - Black, or Driver 2 -
Gray) Remote Keyless Entry (RKE) transmitter. A
customer programmable feature of the memory sys-
tem allows the RKE recall of memory features to be
disabled in cases where there are more than two
drivers of the vehicle.
The memory system also has a customer program-
mable easy exit feature that will move the driver
seat rearward 55 millimeters (two inches) or to the
end of its travel, whichever occurs first, when the key
is removed from the ignition switch lock cylinder.A Memory Seat Module (MSM) or Memory Heated
Seat Module (MHSM) are used on this model to con-
trol and integrate the many electronic functions and
features included in the memory system. On vehicles
equipped with the heated seat system option, the
MHSM also controls the functions and features of
that system.
The memory system includes the following compo-
nents:
²Memory seat module (or memory heated seat
module)
²Memory switch
²Position potentiometers on both outside power
mirrors
²Position potentiometers on the driver side power
seat track and power seat recliner motors.
²Radio receiver (if PCI data bus capable).
Certain functions and features of the memory sys-
tem rely upon resources shared with other electronic
modules in the vehicle over the Programmable Com-
munications Interface (PCI) data bus network. The
PCI data bus network allows the sharing of sensor
information. This helps to reduce wire harness com-
plexity, internal controller hardware, and component
sensor current loads. At the same time, this system
provides increased reliability, enhanced diagnostics,
and allows the addition of many new feature capabil-
ities. For diagnosis of these electronic modules or of
the PCI data bus network, the use of a DRBtscan
tool and the proper Diagnostic Procedures manual
are recommended.
The other electronic modules that may affect mem-
ory system operation are as follows:
²Body Control Module (BCM)- Refer toBody
Control Modulein Electronic Control Modules for
more information.
²Driver Door Module (DDM)- Refer toDoor
Modulein Electronic Control Modules for more
information.
²Electronic Vehicle Information Center
(EVIC)- Refer toElectronic Vehicle Information
Centerin Overhead Console Systems for more infor-
mation.
²Passenger Door Module (PDM)- Refer to
Door Modulein Electronic Control Modules for
more information.
²Powertrain Control Module (PCM)- Refer to
Powertrain Control Modulein Electronic Control
Modules for more information.
²Radio Receiver- Refer toRadio Receiverin
Audio Systems for more information.
Refer toHeated Seat Systemfor more informa-
tion on this system. Refer toRemote Keyless Entry
Systemin Power Lock Systems for more information
on the RKE system. Refer toPower Mirrorin
Power Mirror Systems for more information on the
WJPOWER SEAT SYSTEM 8N - 19
POWER SEAT SYSTEM (Continued)

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

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

INSTALLATION
(1) Position seat on floor pan.
(2) If equipped, connect power seat wire harness
connector.
(3) Install rear bolts attaching seat to floor pan.
Tighten bolts to 40 N´m (30 ft. lbs.) torque.
(4) If equipped, install cover on seat track.
(5) Move seat to full rearward position.
(6) Install front bolts attaching seat to floor pan.
Tighten bolts to 40 N´m (30 ft. lbs.) torque.
FRONT SEAT BACK
REMOVAL
(1) Move seat to full rearward position.
(2) Remove inboard bolt attaching seat back frame
to seat cushion frame.
(3) Move seat to full forward position.
(4) Move seat back to full recline position.
(5) Remove screws attaching seat side shield to
seat frame.
(6) Disconnect wire harness connector from
recliner motor, if equipped.
(7) From the underside of the seat, disconnect the
wire harness connector for the power lumber and/or
heated seat, if equipped.
(8) Remove outboard bolts attaching recliner to
seat cushion frame.
(9) Route the power lumber and/or heated seat
harness through the seat cushion cover, if equipped.
(10) Separate seat back from seat cushion.
INSTALLATION
(1) Position seat back on seat cushion.
(2) Route the power lumber and heater harness
through the seat cushion cover, if equipped.
(3) Install recliner bolts attaching seat back frame
to seat cushion frame. Tighten bolts to 28 N´m (20 ft.
lbs.) torque.
(4) Install the inboard bolt attaching seat back
frame to seat cushion frame. Tighten bolt to 47N´m
(35 ft.lbs.).
(5) Connect wire harness connector to recliner
motor and/or heated seat, if equipped.
(6) From the underside of the seat, connect the
power lumber and/or heated seat wire harness con-
nector to the seat harness, if equipped.
(7) Install screws attaching seat side shield to seat
frame.
FRONT SEAT BACK COVER
REMOVAL
(1) Remove head restraint (Refer to 23 - BODY/
SEATS/FRONT HEADREST - REMOVAL).
(2) Using a trim stick, carefully pry head restraint
release button caps from the top of seat back.
(3) Remove seat back (Refer to 23 - BODY/SEATS/
FRONT SEAT BACK - REMOVAL).
(4) Disengage J-strap at base of seat back.
(5) Slide hand between the face of the seat back
pad and the cushion cover and carefully separate
hook and loop fastener (Fig. 5).
(6) Roll cover upward and disengage hog rings.
(7) Roll cover upward to top of seat back.
(8) Separate cover from seat back.
INSTALLATION
(1) Position cover inside-out at the top of seat
back.
(2) Roll cover downward.
(3) Engage hog rings.
(4) Align seat back cover with hook and loop fas-
teners and secure.
(5) Roll cover downward.
(6) Engage J-strap at base of seat back.
(7) Install seat back (Refer to 23 - BODY/SEATS/
FRONT SEAT BACK - INSTALLATION).
NOTE: The taller head restraint release button cap
is positioned on the left hand side and the head
restraint button cap with the hidden button is posi-
tioned on the right hand side.
Fig. 5 Seat Back Cover
1 - SEAT BACK COVER
2 - HOOK AND LOOP FASTENER
3 - SEAT BACK PAD
WJSEATS 23 - 85
FRONT SEAT (Continued)