CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Passenger Heated Seat Module
C2GY At Heated Seat Back N/S
Passenger Heated Seat Module
C3GN At Heated Seat N/S
Passenger Power Seat Front
Riser MotorRD Under Seat N/S
Passenger Power Seat Horizontal
MotorBK Under Seat N/S
Passenger Power Seat Rear
Riser MotorRD Under Seat N/S
Passenger Power Seat Recliner
MotorGN Under Seat N/S
Passenger Power Seat Switch GN At Switch N/S
Passenger Power Window Motor RD At Motor 44
Passenger Power Window Switch BK At Switch 44
Passenger Seat Belt Switch On Seat Harness N/S
Passenger Seat Belt Tensioner On Seat Harness N/S
Power Folding Mirror Switch
(Export)BK Near Steering Column 31
Power Liftgate Module C1 BK Left Quarter 46, 47
Power Liftgate Module C2 Left Quarter 46, 47
Power Liftgate Motor BK Left Quarter 47
Power Mirror Switch BK Rear of Switch 30
Power Outlet (Except Lowline) BK Instrument Panel 20, 23, 25
Power Seat Circuit Breaker GY Under Seat N/S
Powertrain Control Module C1 BK Left Front Engine Compartment 11
Powertrain Control Module C2 BK Left Front Engine Compartment 11
Powertrain Control Module C3 BK Left Front Engine Compartment 11
Powertrain Control Module C4
(EATX)DKGN Left Front Engine Compartment 11
Power Window Circuit Breaker GY Left Side Kick Panel 41 42
Power Window Switch (LHD
Lowline)BK Driver Door 43
Radiator Fan No.1 (Gas) BK Left Side At Motor 1
Radiator Fan No.1 (Diesel) GY Left Side At Motor 1
Radiator Fan No.2 (Gas) BK Right Side At Motor 1, 2
Radiator Fan No.2 (Diesel) GY Right Side At Motor 1, 2
Radiator Fan Relay (Gas) Top of Left Front Frame Rail 1
Radiator Fan Relay No. 1
(Diesel)BL Left Front Engine Compartment 2
Radiator Fan Relay No. 2
(Diesel)BL Left Front Engine Compartment 2
Radiator Fan Relay No. 3
(Diesel)BL Left Front Engine Compartment 2
Radio C1 Rear of Radio 20
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-9
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Right Front Park/Turn Signal
Lamp (Except Export)BK At Lamp 1, 3
Right Front Wheel Speed Sensor GY Right Fender Side Shield 3,10, 16, 17
Right Full Open Switch (Power
Sliding Door)BK Right Sliding Door 45
Right Headlamp (Except Export) BK At Lamp 1, 3
Right Headlamp Leveling Motor
(Export)WT At Right Headlamp N/S
Right High Beam Lamp (Export) BK At Right Headlamp N/S
Right Instrument Panel Speaker BK At Speaker 20, 23, 24
Right Liftgate Flood Lamp GY At Lamp 49
Right Low Beam Lamp (Export) BK At Right Headlamp N/S
Right Mid Reading Lamp
(Premium/ Luxury)GY At Lamp N/S
Right Park Lamp (Export) BK AT Lamp N/S
Right Power Mirror BK At Mirror 20, 24, 28
Right Rear Lamp Assembly BK At Lamp 48
Right Rear Pillar Speaker BK At Speaker 48
Right Rear Reading Lamp
(Luxury)GY At Lamp N/S
Right Rear Speaker (Highline) BK/RD At Speaker 48
Right Rear Speaker (Lowline) At Speaker N/S
Right Rear Vent Motor NAT At Motor 48
Right Rear Wheel Speed Sensor BK Right Rear of Floor Pan 48
Right Remote Radio Switch BK At Steering Wheel N/S
Right Repeater Lamp (Export) GY Right Front Fender 39
Right Seat Airbag YL At Passenger Seat N/S
Right Side Impact Sensor 1
(Premium ORC)DKGY Right B Pillar 39
Right Sliding Door Control
Module C1BK Rear of Door 45, 46
Right Sliding Door Control
Module C2Rear of Door 45, 46
Right Sliding Door Latch Sensing
SwitchBK At Sliding Door 45
Right Sliding Door Lock Motor BK Rear of Door 45
Right Sliding Door Lock
Motor/Ajar Switch (Manual Sliding
Door)BK At Latch N/S
Right Sliding Door Motor BK At Sliding Door 45
Right Speed Control Switch BK At Steering Wheel N/S
Right Stop/Turn Signal Relay BK LT Quarter Panel N/S
Right Turn Signal Lamp OR At Lamp N/S
Right Visor/Vanity Lamp BK At Lamp N/S
RS8W-91 CONNECTOR/GROUND/SPLICE LOCATION8W-91-11
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
SPLICE NUMBER LOCATION FIG.
S126 In Right Headlamp Leveling Assembly N/S
S127 (Diesel) In T/O for Engine Starter Motor N/S
S128 (Diesel) Near T/O for Engine Starter Motor N/S
S129 (Diesel) Near T/O for Battery (+) N/S
S130 (Diesel) Near T/O for Battery (+) N/S
S131 Near T/O for Transmission Control Module 11
S131 (3.3L/3.8L) Near T/O for C110 N/S
S132 (Diesel) Near T/O for Battery (+) N/S
S134 (Diesel) IN T/O for Engine Control Module N/S
S135 (Diesel) Near T/O for Glow Plug No.2 N/S
S136 (Diesel) In T/O for Radiator Fan Relays 2
S137 (Diesel) Above Starter 15
S138 (Diesel) Between T/O for Radiator Fan No.2 and T/O for G102 N/S
S139 (Diesel) Between T/O for Engine Starter Motor and T/O for
Engine Control Module C115, 16
S141 (2.4L) Near T/O for C110 11
S141 (Diesel) Near T/O for G100 N/S
S141 (3.3L/3.8L) Near T/O for Powertrain Control Module N/S
S142 (3.3L/3.8L) Near T/O for A/C Compressor Clutch 18
S144 (Diesel) Between T/O for Battery Temperature Sensor and T/O
for C103N/S
S148 (Diesel) Near T/O for Engine Starter Motor 5
S150 (Diesel) Between T/O for Battery Temperature Sensor and T/O
for C103N/S
S151 (Diesel) Near T/O for Radiator Fan Relays 2
S152 (Diesel) Near T/O for Radiator Fan No.1 N/S
S157 (Diesel) Near T/O for Glow Plug No.4 15
S177 In Right Headlamp Wiring Assembly N/S
S179 In Left Headlamp Wiring Assembly N/S
S187 (Diesel) In T/O for Engine Control Module C1 N/S
S188 (Diesel) Near T/O for Radiator Fan Relays 2
S201 In T/O to Instrument Panel Speaker 20, 26
S202 Near T/O for Instrument Panel Switch Bank 20, 26
S203 Near T/O for Instrument Panel Switch Bank 26
S204 Near T/O to Instrument Panel Speaker 20, 26
S205 Near T/O for C201 N/S
S206 Near T/O for Instrument Cluster 20
S207 Near T/O for A/C Heater Control 20, 26
S208 (RHD) Between T/O for Antenna Connector and T/O for Front
Cigar Lighter26
S209 Near T/O for Evaporator Temperature Sensor N/S
S210 (RHD) Near T/O for C203 26
S211 In Steering Column Wiring Assembly N/S
8W - 91 - 14 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONRS
CONNECTOR/GROUND/SPLICE LOCATION (Continued)
8W-97 POWER DISTRIBUTION SYSTEM
TABLE OF CONTENTS
page page
POWER DISTRIBUTION SYSTEM
DESCRIPTION..........................1
OPERATION............................1
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS.........1
INTEGRATED POWER MODULE
DESCRIPTION..........................2
OPERATION............................2
REMOVAL.............................2
INSTALLATION..........................3IOD FUSE
DESCRIPTION..........................3
OPERATION............................3
POWER OUTLET
DESCRIPTION..........................4
OPERATION............................4
DIAGNOSIS AND TESTING
DIAGNOSIS & TESTING - POWER OUTLET . . 4
REMOVAL.............................5
INSTALLATION..........................5
POWER DISTRIBUTION
SYSTEM
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:
²Integrated Power Module (IPM)
²Front Control Module (FCM)
²Power Outlets
Refer to Wiring Diagrams for complete circuit sche-
matics.
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 fuses
²Circuit splice blocks
²Flashers
²Fusible links
²Relays
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.
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 many standard and optional facto-
ry-installed electrical and electronic powertrain,
chassis, safety, security, comfort and convenience sys-
tems. At the same time, the power distribution sys-
tem was designed to provide ready access to these
electrical distribution points for the vehicle techni-
cian to use when conducting diagnosis and repair of
faulty circuits. The power distribution system can
also prove useful for the sourcing of additional elec-
trical circuits that may be required to provide the
electrical current needed to operate many accessories
that the vehicle owner may choose to have installed
in the aftermarket.
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS
Terminal Pick Kit 6680
RS8W-97 POWER DISTRIBUTION SYSTEM8W-97-1
INTEGRATED POWER MODULE
DESCRIPTION
The Integrated Power Module (IPM) is a combina-
tion of the Power Distribution Center (PDC) and the
Front Control Module (FCM). The IPM is located in
the engine compartment, next to the battery on this
model (Fig. 1). The power distribution center mates
directly with the Front Control Module (FCM) to
form the IPM Fuse and Relay Center. The power dis-
tribution center (PDC) is a printed circuit board
based module that contains fuses and relays, while
the front control module contains the electronics con-
trolling the IPM and other functions. This IPM con-
nects directly to the battery positive via a four pin
connector. The ground connection is via two other
connectors. The IPM provides the primary means of
voltage distribution and protection for the entire
vehicle.
The molded plastic IPM housing includes a base
and cover. The IPM cover is easily opened or removed
for service access by squeezing the two marked cover
latches and has a fuse and relay layout map integral
to the inside surface of the cover. This IPM housing
base and cover are secured in place by an IPM
mounting bracket. This mounting bracket is designed
to allow the IPM to rotate counter-clockwise once the
locking tab is disengaged. The IPM mounting bracketis secured in place by bolts threaded into the left
front wheel house.
OPERATION
All of the current from the battery and the gener-
ator output enters the Integrated Power Module
(IPM) via a four- pin connector on the bottom of the
module. The IPM cover is unlatched and opened or
removed to access the fuses or relays. Internal con-
nections of all of the power distribution center cir-
cuits is accomplished by a combination of bus bars
and a printed circuit board. Refer to the Wiring sec-
tion of the service manual for complete IPM circuit
schematics.
REMOVAL
(1) Disconnect the negative and positive battery
cables.
(2) Remove the battery thermal guard from the
vehicle. Refer to the Battery section for the proce-
dure.
(3) Remove the battery from the vehicle. Refer to
the Battery section for the procedure.
(4) Using a flat-bladed screwdriver, twist the Inte-
grated Power Module (IPM) bracket retaining latch
outward to free the intelligent power module from its
mounting bracket (Fig. 2).
(5) Rotate the IPM counter-clockwise to access and
disconnect the various electrical connectors (Fig. 3).
(6) Free the IPM from its mounting bracket by
removing the IPM bracket clips from the hinge. A
screwdriver slipped up from under the hinge will free
the clips.
Fig. 1 BATTERY THERMAL GUARD
1 - BATTERY THERMAL GUARD
2 - INTEGRATED POWER MODULE
3 - FRONT CONTROL MODULE
Fig. 2 RELEASING INTEGRATED POWER MODULE
FROM ITS MOUNTING BRACKET
8W - 97 - 2 8W-97 POWER DISTRIBUTION SYSTEMRS
INSTALLATION
(1) Snap the left side of the Integrated Power Mod-
ule (IPM) housing in its mounting bracket and con-
nect the various electrical connectors. Care must be
taken that the Connector Positive Assurance (CPA)
on the five-pin B+ connector is positively engaged to
prevent generating a Diagnostic Trouble Code (DTC).
NOTE: IPM electrical connectors are color coded to
ease location reference.
(2) Being certain no wires are stressed or pinched,
rotate the IPM clock-wise until secured in mounting
bracket. An audible click may be heard.
(3) Install the battery in the vehicle. Refer to the
Battery section for the procedure.
(4) Install the battery thermal guard in the vehi-
cle. Refer to the Battery section for the procedure.
(5)
Connect the negative and positive battery cables.
(6) Using a diagnostic scan tool, check for any
stored diagnostic trouble codes and correct, check
that all vehicle options are operational before return-
ing the vehicle to service.
IOD FUSE
DESCRIPTION
All vehicles are equipped with an Ignition-Off
Draw (IOD) fuse that is removed from its normal
cavity in the Integrated Power Module (IPM) whenthe vehicle is shipped from the factory. Dealer per-
sonnel are to remove the IOD fuse from the storage
location and install it into the IPM fuse cavity
marked IOD as part of the preparation procedures
performed just prior to new vehicle delivery.
The IPM has a molded plastic cover that can be
removed to provide service access to all of the fuses
and relays in the IPM. An integral latch and hinges
are molded into the IPM cover for easy removal. A
fuse layout map is integral to the underside of the
IPM cover to ensure proper fuse and relay identifica-
tion. The IOD fuse is a 20 ampere blade-type mini
fuse and, when removed, it is stored in a fuse cavity
adjacent to the washer fuse within the IPM.
OPERATION
The term ignition-off draw identifies a normal condi-
tion where power is being drained from the battery with
the ignition switch in the Off position. The IOD fuse
feeds the memory and sleep mode functions for some of
the electronic modules in the vehicle as well as various
other accessories that require battery current when the
ignition switch is in the Off position, including the
clock. The only reason the IOD fuse is removed is to
reduce the normal IOD of the vehicle electrical system
during new vehicle transportation and pre-delivery stor-
age to reduce battery depletion, while still allowing
vehicle operation so that the vehicle can be loaded,
unloaded and moved as needed by both vehicle trans-
portation company and dealer personnel.
The IOD fuse is removed from the IPM fuse cavity
when the vehicle is shipped from the assembly plant.
Dealer personnel must install the IOD fuse when the
vehicle is being prepared for delivery in order to
restore full electrical system operation. Once the
vehicle is prepared for delivery, the IOD function of
this fuse becomes transparent and the fuse that has
been assigned the IOD designation becomes only
another Fused B(+) circuit fuse. The IOD fuse serves
no useful purpose to the dealer technician in the ser-
vice or diagnosis of any vehicle system or condition,
other than the same purpose as that of any other
standard circuit protection device.
The IOD fuse can be used by the vehicle owner as
a convenient means of reducing battery depletion
when a vehicle is to be stored for periods not to
exceed about thirty days. However, it must be
remembered that removing the IOD fuse will not
eliminate IOD, but only reduce this normal condition.
If a vehicle will be stored for more than about thirty
days, the battery negative cable should be discon-
nected to eliminate normal IOD; and, the battery
should be tested and recharged at regular intervals
during the vehicle storage period to prevent the bat-
tery from becoming discharged or damaged. Refer to
Battery Systemfor additional service information.
Fig. 3 DISCONNECTING IPM
1 - INTEGRATED POWER MODULE FUSE & RELAY CENTER
RS8W-97 POWER DISTRIBUTION SYSTEM8W-97-3
INTEGRATED POWER MODULE (Continued)
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak. If a leak is
present in this area, remove transmission for further
inspection.
(a) Circular spray pattern generally indicates
seal leakage or crankshaft damage.
(b) Where leakage tends to run straight down,
possible causes are a porous block, oil gallery cup
plug, bedplate to cylinder block mating surfaces
and seal bore. See proper repair procedures for
these items.
(4) If no leaks are detected, pressurize the crank-
case as previously described.
CAUTION: Do not exceed 20.6 kPa (3 psi).
(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
(7) After the oil leak root cause and appropriate
corrective action have been identified, replace compo-
nent(s) as necessary.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
Ensure the battery is completely charged and the
engine starter motor is in good operating condition.
Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
(1) Check engine oil level and add oil if necessary.
(2) Drive the vehicle until engine reaches normal
operating temperature. Select a route free from traf-
fic and other forms of congestion, observe all traffic
laws, and accelerate through the gears several times
briskly.
(3) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for abnor-
mal firing indicators fouled, hot, oily, etc. Record cyl-
inder number of spark plug for future reference.(4) Remove the Auto Shutdown (ASD) relay from
the PDC.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gauge adaptor Special Tool
8116 or the equivalent, into the #1 spark plug hole in
cylinder head. Connect the 0±500 psi (Blue) pressure
transducer (Special Tool CH7059) with cable adap-
tors to the DRBIIIt. For Special Tool identification,
(Refer to 9 - ENGINE - SPECIAL TOOLS).
(7) Crank engine until maximum pressure is
reached on gauge. Record this pressure as #1 cylin-
der pressure.
(8) Repeat the previous step for all remaining cyl-
inders.
(9) Compression should not be less than 689 kPa
(100 psi) and not vary more than 25 percent from cyl-
inder to cylinder.
(10) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(11) If the same cylinder or cylinders repeat an
abnormally low reading on the second compression
test, it could indicate the existence of a problem in
the cylinder in question.The recommended com-
pression pressures are to be used only as a
guide to diagnosing engine problems. An engine
should not be disassembled to determine the
cause of low compression unless some malfunc-
tion is present.
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
²Exhaust and intake valve leaks (improper seat-
ing).
²Leaks between adjacent cylinders or into water
jacket.
²Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the pressure cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
RSENGINE 2.4L9-9
ENGINE 2.4L (Continued)
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak. If a leak is
present in this area, remove transmission for further
inspection.
(a) Circular spray pattern generally indicates
seal leakage or crankshaft damage.
(b) Where leakage tends to run straight down,
possible causes are a porous block, oil gallery cup
plug, bedplate to cylinder block mating surfaces
and seal bore. See proper repair procedures for
these items.
(4) If no leaks are detected, pressurize the crank-
case as previously described.
CAUTION: Do not exceed 20.6 kPa (3 psi).
(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
(7) After the oil leak root cause and appropriate
corrective action have been identified, replace compo-
nent(s) as necessary.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
Ensure the battery is completely charged and the
engine starter motor is in good operating condition.
Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
(1) Check engine oil level and add oil if necessary.
(2) Drive the vehicle until engine reaches normal
operating temperature. Select a route free from traf-
fic and other forms of congestion, observe all traffic
laws, and accelerate through the gears several times
briskly.
(3) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for abnor-
mal firing indicators fouled, hot, oily, etc. Record cyl-
inder number of spark plug for future reference.(4) Remove the Auto Shutdown (ASD) relay from
the PDC.
(5) Be sure throttle blade is fully open during the
compression check.
(6) Insert compression gauge adaptor Special Tool
8116 or the equivalent, into the #1 spark plug hole in
cylinder head. Connect the 0±500 psi (Blue) pressure
transducer (Special Tool CH7059) with cable adap-
tors to the DRBIIIt. For Special Tool identification,
(Refer to 9 - ENGINE - SPECIAL TOOLS).
(7) Crank engine until maximum pressure is
reached on gauge. Record this pressure as #1 cylin-
der pressure.
(8) Repeat the previous step for all remaining cyl-
inders.
(9) Compression should not be less than 689 kPa
(100 psi) and not vary more than 25 percent from cyl-
inder to cylinder.
(10) If one or more cylinders have abnormally low
compression pressures, repeat the compression test.
(11) If the same cylinder or cylinders repeat an
abnormally low reading on the second compression
test, it could indicate the existence of a problem in
the cylinder in question.The recommended com-
pression pressures are to be used only as a
guide to diagnosing engine problems. An engine
should not be disassembled to determine the
cause of low compression unless some malfunc-
tion is present.
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
²Exhaust and intake valve leaks (improper seat-
ing).
²Leaks between adjacent cylinders or into water
jacket.
²Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the pressure cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
RSENGINE 3.3/3.8L9-83
ENGINE 3.3/3.8L (Continued)