Jeep 2001 Wrangler TJ, Service Manual

Page: 45 / 508

(4) Disconnect the floor wire harness connector
from the seat belt switch pigtail wire connector.
Check for continuity between the seat belt switch
sense circuit cavity of the instrument panel wire har-
ness connector (Connector C2) for the instrument
cluster and a good ground. There should be no conti-
nuity. If OK, go to Step 5. If not OK, repair the
shorted seat belt switch sense circuit between the
instrument cluster and the seat belt switch as
required.
(5) Check for continuity between the seat belt
switch sense circuit cavities of the instrument panel
wire harness connector (Connector C2) for the instru-
ment cluster and the floor wire harness connector for
the seat belt switch. There should be continuity. If
OK, refer to PRELIMINARY DIAGNOSIS . If not
OK, repair the open seat belt switch sense circuit
between the instrument cluster and the seat belt
switch as required.
INTERIOR LIGHTING CONTROL DIAGNOSIS
Before performing this test, complete the testing of
each of the hard wired interior lighting switches.
Refer to the appropriate wiring information. The wir-
ing information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, 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.
NOTE: The following tests may not prove conclu-
sive in the diagnosis of this system. The most reli-
able, efficient, and accurate means to diagnose the
Interior Lighting Control function of the instrument
cluster requires the use of a DRBIII
T
scan tool.
Refer to the appropriate diagnostic information.
(1) Check the door ajar switch output fuse (Fuse 4
- 10 ampere) in the fuse block. If OK, go to Step 2. If
not OK, repair the shorted circuit or component as
required and replace the faulty fuse.
(2) Check for continuity between the door ajar
switch output fuse (Fuse 4 - 10 ampere) in the fuse
block and a good ground. There should be continuity.
If OK, go to Step 3. If not OK, repair the open
ground circuit between the fuse block and ground
(G300) as required.
(3) Disconnect and isolate the battery negative
cable. Disconnect the cross body wire harness connec-
tor for the driver and/or passenger door ajar switch
from the switch connector receptacle. Check for con-
tinuity between the door ajar switch output circuit
cavity of the driver or passenger door ajar switch and
a good ground. There should be continuity. If OK, go
to Step 4. If not OK, repair the open door ajar switch
output circuit between the driver or passenger door
ajar switch and the fuse block as required.
(4) 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 driver and/or passenger
door ajar switch sense circuit cavities of the instru-
ment 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 driver and/or passenger door
ajar switch sense circuits between the instrument
cluster and the driver and/or passenger door ajar
switches as required.
(5) Check for continuity between the driver and/or
passenger door ajar switch sense circuit cavities of
the instrument panel wire harness connector (Con-
nector C2) for the instrument cluster and the cross
body wire harness connector for the driver and/or
passenger door ajar switches. There should be conti-
nuity. If OK, use a DRBIII
t
scan tool to complete the
diagnosis of the instrument cluster interior lighting
control. Refer to the appropriate diagnostic informa-
tion. If not OK, repair the open driver and/or passen-
ger door ajar switch sense circuits between the
instrument cluster and the driver and/or passenger
door ajar switches as required.
REAR WINDOW DEFOGGER CONTROL DIAGNOSIS
Before performing this test, complete the testing of
the rear window defogger switch and the rear win-
dow defogger relay. Refer to the appropriate wiring
information. The wiring information includes wiring
diagrams, proper wire and connector repair proce-
dures, details of wire harness routing and retention,
connector pin-out information and location views for
the various wire harness connectors, splices and
grounds.
8Js - 10 INSTRUMENT CLUSTER
TJ
INSTRUMENT CLUSTER (Continued)