HB 8W-97 POWER DISTRIBUTION - SERVICE INFORMATION 8W - 97 - 1
8W-97 POWER DISTRIBUTION - SERVICE INFORMATION
TABLE OF CONTENTS
page page
POWER DISTRIBUTION - SERVICE
INFORMATION
DESCRIPTION ..........................1
OPERATION ............................1
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS .........2
MODULE-INTEGRATED POWER
DESCRIPTION ..........................3
OPERATION ............................3
REMOVAL .............................3
INSTALLATION ..........................4
IOD FUSE
DESCRIPTION ..........................4
OPERATION ............................4
JUNCTION BLOCK
DESCRIPTION ..........................5
OPERATION ............................5
REMOVAL .............................6
INSTALLATION ..........................6
POWER DISTRIBUTION CENTER
DESCRIPTION ..........................7
OPERATION ............................7
REMOVAL .............................7
INSTALLATION ..........................8
POWER OUTLET
REMOVAL .............................8
INSTALLATION ..........................8
POWER DISTRIBUTION - SERVICE INFORMATION
DESCRIPTION
The power distribution system for this vehicle consists of the following components:
• Cigar Lighter Outlet
• Front Control Module (FCM)
• Integrated Power Module (IPM)
• Power Distribution Center (PDC)
• Power Outlets
Refer to Wiring Diagrams for complete circuit schematics.
The power distribution system also incorporates various types of circuit control and protection features, including:
• Automatic resetting circuit breakers
• Blade-type fuses
• Cartridge fuses
• Relays
OPERATION
The power distribution system for this vehicle is designed to provide safe, reliable, and centralized distribution points
for the electrical current required to operate all of the many standard and optional factory-installed electrical and
electronic powertrain, chassis, safety, security, comfort and convenience systems. At the same time, the power distribution system was designed to provide ready access to these electrical distribution points for the technician to use
when conducting diagnosis and repair of inoperative circuits. The power distribution system can also prove useful
for the sourcing of additional electrical circuits that may be required to provide the electrical current needed to operate many accessories that the vehicle owner may choose to have installed.
8W - 97 - 2 8W-97 POWER DISTRIBUTION - SERVICE INFORMATION HB
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS
HB 8W-97 POWER DISTRIBUTION - SERVICE INFORMATION 8W - 97 - 3
MODULE-INTEGRATED POWER
DESCRIPTION
The Integrated Power Module (IPM) is a combination
of the Power Distribution Center (PDC) (1) and the
Front Control Module (FCM) (2). The IPM is located in
the engine compartment, next to the battery. The
power distribution center mates directly with the (FCM)
to form the IPM. The (PDC) is a printed circuit board
based module that contains fuses and relays, while
the FCM contains the electronics controlling the IPM
and other functions. The IPM connects directly to the
battery positive via a stud located on top of the unit.
The ground connection is via electrical connectors.
The IPM provides the primary means of voltage distribution and protection for the entire vehicle.
OPERATION
All of the current from the battery and the generator output enters the integrated power module via a stud on the top
of the module. Internal connections of all of the power distribution center circuits is accomplished by a combination
of bus bars and a printed circuit board.
REMOVAL
1. Disconnect the negative and positive battery
cables.
2. Unsnap cover and remove the B+ terminal nut from
the integrated power module (IPM). Remove the
B+ cable.
3. Remove the IPM from the retaining bracket (1).
4. Disconnect the connectors from the (IPM).
5. Remove the Front Control Module (FCM) (2) retaining screws.
6. Disconnect the front control module by pulling it
straight off the integrated power module.
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