Commander 4WD V8-4.7L VIN N (2006)
Relay Box: Description and Operation
Power Distribution Center
The electrical current distributed throughout this vehicle is directed through the Power Distribution Center (PDC) (1) and Integrated Power Module
(IPM) (2). The PDC is located in the left front corner of the engine compartment, between the IPM and the brake master cylinder. The PDC houses
maxi-type cartridge fuses, which replace most in-line fusible links. Some fusible links still exist in the electrical harness depending on powertrain
combination. The PDC also houses blade-type mini fuses, and International Standards Organization (ISO) relays.
The PDC housing is secured in the engine compartment at three points. Integral mounts on both sides of the PDC housing engage and latch to stanchions
that are integral to the molded plastic support bracket. The PDC is integral to the headlamp and dash wire harness, which exits from the bottom of the
PDC housing. The PDC housing has a molded plastic cover that includes two integral latches and pivot hooks that snap over a hinge pin on the side of
the PDC housing. The PDC cover is easily opened or removed for service access and has a convenient fuse and relay layout map integral to the inside
surface of the cover to ensure proper component identification.
The PDC cannot be repaired and is only serviced as a unit with the headlamp and dash wire harness. If the PDC main housing unit, fuse wedges or the
bus bars are inoperative or damaged, the complete headlamp and dash wire harness unit must be replaced.
All of the current from the battery and the generator output enters the PDC through two cables and a single two-holed eyelet that is secured with nuts to
the two PDC B(+) terminal studs just inside the front end of the PDC housing. The PDC cover is unlatched and opened to access the battery and
generator output connection B(+) terminal studs, the fuses or the relays. Internal connection of all of the PDC circuits is accomplished by an intricate
combination of hard wiring and bus bars.
For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector
