Toyota
Dodge Durango
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Power Distribution System » Description and operation
Junction block

DESCRIPTION

Fig. 2 Junction Block Location Fig. 2 Junction Block Location

1 - FUSE ACCESS PANEL

2 - JUNCTION BLOCK

3 - INSTRUMENT PANEL

An electrical Junction Block (JB) is concealed behind the left outboard end of the instrument panel cover (Fig. 2). The JB serves to simplify and centralize numerous electrical components, and to distribute electrical current to many of the accessory systems in the vehicle. It also eliminates the need for numerous splice connections and serves in place of a bulkhead connector between many of the engine compartment, instrument panel, and body wire harnesses. The JB houses up to nineteen blade-type fuses (two standard- type and seventeen mini-type), up to two bladetype automatic resetting circuit breakers, and two International Standards Organization (ISO) relays (one standard-type and one micro-type).

The molded plastic JB housing has integral mounting brackets that are secured with two screws to the left instrument panel end bracket. The left end of the instrument panel cover has a snap-fit fuse access panel that can be removed for service of the JB. A fuse puller and spare fuse holders are located on the back of the fuse access cover, as well as an adhesivebacked fuse layout map to ensure proper fuse identification.

The JB unit cannot be repaired and is only serviced as an assembly. If any internal circuit or the JB housing is faulty or damaged, the entire JB unit must be replaced.

OPERATION

All of the circuits entering and leaving the JB do so through up to nine wire harness connectors, which are connected to the JB through integral connector receptacles molded into the JB housing. Internal connection of all of the JB circuits is accomplished by an intricate combination of hard wiring and bus bars.

Refer to Junction Block in the index of this service manual for the location of complete JB circuit diagrams.

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