Grand Cherokee 2WD V8-4.7L VIN N (2000)
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 disconnected to eliminate normal IOD;
and, the battery should be tested and recharged at regular intervals during the vehicle storage period to prevent the battery from becoming
discharged or damaged. Refer to Battery for the additional service information covering the battery.
JUNCTION BLOCK
Junction Block Location
An electrical Junction Block (JB) is concealed beneath the driver side of the instrument panel in the passenger compartment of the vehicle. 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 up to thirty-three blade type mini fuses, up to two blade-type automatic resetting circuit breakers, the
electronic combination flasher, the Daytime Running Lamp (DRL) module (Canada only) and up to twelve International Standards Organization
(ISO) relays (three standard-type and nine micro-type). The JB also incorporates an integral connector and mounting for the Body Control Module
(BCM). The BCM is secured with four screws directly to the dash panel side of the JB. Refer to Body Control Module for the location of more
information covering the BCM.
The molded plastic JB housing has integral mounts that are secured with two screws and two snap retainers to the instrument panel steering
column support bracket behind the instrument panel steering column opening cover. The JB is concealed above the molded plastic instrument
panel fuse cover. Integral latches molded into the fuse cover secure it the JB, the BCM and the 16-way data link connector tab of the instrument
panel steering column support bracket. The fuse cover can be pulled downward to disengage the latches and provide service access to all of the
fuses, relays and wire harness connectors of the JB. The fuse cover has a fuse puller and spare fuses secured to its upper surface. Refer to
Instrument Panel Fuse Cover for the additional service information covering the fuse cover.
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. The BCM is available for separate service replacement.
All of the circuits entering and leaving the JB do so through up to five 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 a printed circuit board. There
are also two separate wire harness connections to connector receptacles that are integral to the BCM.
IGNITION-OFF DRAW CONNECTOR