Cluster Illumination Diagnosis - Jeep Wrangler 2001 Service Manual

TJ
INSTRUMENT CLUSTER (Continued)
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable. Remove the rear window defogger relay from
the receptacle in the Power Distribution Center
(PDC). Disconnect the instrument panel wire harness
connector for the rear window defogger switch from
the switch connector receptacle. Remove the instru-
ment cluster from the instrument panel.
(2) Check for continuity between the rear window
defogger switch sense circuit cavity of the instrument
panel wire harness connector (Connector C2) for the
instrument cluster and a good ground. There should
be no continuity. If OK, go to Step 3. If not OK,
repair the shorted rear window defogger switch sense
circuit between the instrument cluster and the rear
window defogger switch as required.
(3) Check for continuity between the rear window
defogger switch sense circuit cavities of the instru-
ment panel wire harness connectors for the instru-
ment cluster (Connector C2) and the rear window
defogger switch. There should be continuity. If OK,
go to Step 4. If not OK, repair the open rear window
defogger switch sense circuit between the instrument
cluster and the rear window defogger switch as
required.
(4) Check for continuity between the rear window
defogger relay control circuit cavity of the instrument
panel wire harness connector (Connector C2) for the
instrument cluster and a good ground. There should
be no continuity. If OK, go to Step 5. If not OK,
repair the shorted rear window defogger relay control
circuit between the instrument cluster and the PDC
as required.
(5) Check for continuity between the rear window
defogger relay control circuit cavities of the instru-
ment panel wire harness connector (Connector C2)
for the instrument cluster and the rear window
defogger relay receptacle in the PDC. There should
be continuity. If OK, replace the faulty instrument
cluster. If not OK, repair the open rear window
defogger relay control circuit between the instrument
cluster and the PDC as required.
2001 JEEP WRANGLER

CLUSTER ILLUMINATION DIAGNOSIS

The diagnosis found here addresses an inoperative
instrument cluster illumination lamp condition. If
the problem being diagnosed is a single inoperative
illumination lamp, be certain that the bulb and bulb
holder unit are properly installed in the instrument
cluster electronic circuit board. If no installation
problems are found replace the faulty bulb and bulb
holder unit. If all of the cluster illumination lamps
are inoperative and the problem being diagnosed
includes inoperative exterior lighting controlled by
the left multi-function switch, that system needs to
be repaired first. If the exterior lamps controlled by
the left multi-function switch are inoperative, (Refer
to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERI-
OR/HEADLAMP - DIAGNOSIS AND TESTING). If
no exterior lighting system problems are found, the
following procedure will help locate a short or open
in the cluster illumination lamp circuit. Refer to the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
(1) Disconnect and isolate the battery negative
cable. Disconnect the cross body wire harness connec-
tor for the left multi-function switch from the switch
connector receptacle. Check for continuity between
the ground circuit cavity of the cross body wire har-
ness connector for the left multi-function switch and
a good ground. There should be continuity. If OK, go
to Step 2. If not OK, repair the open ground circuit to
ground (G300) as required.
(2) Remove the instrument cluster from the instru-
ment panel. Disconnect the instrument panel wire
harness connector (Connector C2) for the instrument
cluster from the cluster connector receptacle. Check
for continuity between the panel lamp dimmer signal
circuit cavity of the instrument panel wire harness
connector (Connector C2) for the instrument cluster
INSTRUMENT CLUSTER 8Js - 11