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 Instru-
ment Panel Fuse Cover in the index of this service
manual for the location of additional service informa-
tion covering the fuse cover.
The JB unit cannot be repaired and is only ser-
viced 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.
OPERATION
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 con-
nection 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. Refer to Junction
Block in the index of this service manual for the
location of complete JB circuit diagrams.
IGNITION-OFF DRAW CONNECTOR
DESCRIPTION
All vehicles are equipped with an Ignition-Off
Draw (IOD) connector that is located in a molded
connector receptacle on the lower rear surface of the
Junction Block (JB) housing (Fig. 4). The JB is con-
cealed above the molded plastic instrument panel
fuse cover. Integral latches molded into the fuse
cover secure it the JB, the Body Control Module
(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.
Refer to Instrument Panel Fuse Cover in the
index of this service manual for the location of addi-
tional service information covering the fuse cover.
OPERATION
The term ignition-off draw identifies a normal con-
dition where power is being drained from the battery
with the ignition switch in the Off position. The IOD
connector feeds the memory and sleep mode func-
tions for some of the electronic modules in the vehicle
as well as various other accessories that require bat-
tery current when the ignition switch is in the Off
position, including the clock.
Fig. 4 Ignition-Off Draw Connector
1 – SNAP CLIPS
2 – SCREW
3 – BULKHEAD CONNECTOR
4 – LEFT BODY WIRE HARNESS
5 – IOD CONNECTOR
6 – FUSED B+ CONNECTOR
7 – RIGHT BODY WIRE HARNESS
8 – SCREW
9 – BULKHEAD CONNECTOR
10 – JUNCTION BLOCK
8O - 4
POWER DISTRIBUTION SYSTEMS
WJ
DESCRIPTION AND OPERATION (Continued)