08 - Electrical/8W - Wiring/Power Distribution/JUNCTION ...



08 - Electrical/8W - Wiring/Power Distribution/JUNCTION BLOCK/Description

DESCRIPTION

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An electrical Junction Block (JB) is concealed beneath the driver side of the instrument panel in the passenger compartment of the vehicle. The JB is accessed by pulling down on the steering column opening cover (2) exposing the lower steering column and portions of the instrument panel wiring harness. The JB combines the functions previously provided by a separate fuseblock module and relay center. The JB serves to simplify and centralize numerous electrical components, as well as to distribute electrical current to many of the accessory systems in the vehicle. It also eliminates the need for numerous splice connections. The JB houses blade-type mini fuses, blade-type automatic resetting circuit breakers and International Standards Organization (ISO) relays.

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The molded plastic JB housing is secured with four screws and two snap retainers to the JB mounting bracket behind the instrument panel steering column opening cover (3). The steering column opening cover can be pulled downward to disengage the latches and provide service access to all of the fuses, relays and wire harness connectors (1) of the JB. Refer to Steering Column Opening Cover in Body for additional service information.

The JB contains six relays that are integral to the housing assembly. The relays cannot be replaced separately. If any of the relays are diagnosed inoperative or damaged the complete JB unit must be replaced. The six relays are:

• Lock relay

• Unlock relay

• Driver door unlock relay

• Rear wiper relay

• Ignition “RUN” relay

• Ignition “RUN/ACCESSORY DELAY” relay

DESCRIPTION

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The electrical current distributed throughout this vehicle is directed through the Power Distribution Center (PDC) (1) and Integrated Power Module (IPM) (2). The power distribution center is located in the left front corner of the engine compartment, between the IPM and the brake master cylinder. The power distribution center 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 power distribution center also houses blade-type mini fuses, and International Standards Organization (ISO) relays.

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The power distribution center housing is secured in the engine compartment at three points. Integral mounts on both sides of the power distribution center housing engage and latch to stanchions that are integral to the molded plastic support bracket. The power distribution center is integral to the headlamp and dash wire harness, which exits from the bottom of the power distribution center housing. The power distribution center 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 power distribution center housing. The power distribution center 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.

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