Content .. 299 300 301 302 ..

Jeep Wrangler TJ. Manual - part 301

INSTRUMENT CLUSTER FAILURE MESSAGE

VFD Message

Description

Correction

buS b0

PCM - MIL Message

The cluster is not receiving a MIL lamp
message from the PCM. A DRBIII

scan tool

is required for further diagnosis. Refer to the
appropriate diagnostic information.

buS b1

SKIM - SKIM Message

The cluster is not receiving a SKIS lamp
message from the SKIM. A DRBIII

scan tool

is required for further diagnosis. Refer to the
appropriate diagnostic information.

buS b8

ACM - Airbag Message

The cluster is not receiving an Airbag lamp
message from the ACM. A DRBIII

scan tool

is required for further diagnosis. Refer to the
appropriate diagnostic information.

PanEL OPEn

Panel Sense - Open Circuit

The cluster is not receiving an input from the
the panel lamps dimmer circuitry of the left
multi-function switch on the panel lamps
dimmer signal circuit. Repair the open circuit
or replace the faulty switch as required.

Airbag

Telltale Open/Shorted

The EMIC airbag indicator is open or shorted.
Replace the faulty cluster.

(6) The actuator test is now completed. The instru-

ment cluster will automatically exit the self-diagnos-
tic mode and return to normal operation at the
completion of the test, if the ignition switch is turned
to the Off position during the test, or if a vehicle
speed message indicating that the vehicle is moving
is received from the PCM over the PCI data bus dur-
ing the test.

(7) Go back to Step 1 to repeat the test, if neces-

sary.

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:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

NOSIS OR SERVICE. THIS IS THE ONLY SURE WAY
TO DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT.

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

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 body wire harness connector for
the driver and/or passenger door ajar switch from the
switch connector receptacle. Check for continuity
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

INSTRUMENT CLUSTER

8J - 13

INSTRUMENT CLUSTER (Continued)

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 body
wire harness connector for the driver and/or passen-
ger door ajar switches. There should be continuity. If
OK, use a DRBIII

t scan tool to complete the diagno-

sis of the instrument cluster interior lighting control.
Refer to the appropriate diagnostic information. If
not OK, repair the open driver and/or passenger door
ajar switch sense circuits between the instrument
cluster and the driver and/or passenger door ajar
switches as required.

AXLE LOCKER CONTROL DIAGNOSIS

If the problem being diagnosed involves a rear or

front lock indicator in the instrument cluster that is
blinking on and off, be certain to complete inspection
of the appropriate front or rear axle locker relays,
locker pumps, pneumatic lines, locker indicator
switches, and axle locker mechanisms before per-
forming the following tests. If the problem being
diagnosed involves a rear or front lock indicator in
the instrument cluster that stays on when it should
be off, or stays off when it should be on, complete the
testing of the axle locker switch before performing
the following tests.

These tests will establish the integrity of the hard

wired circuits related to the axle locker control func-
tion of the instrument cluster. However, proper test-
ing of the instrument cluster programming and the
electronic vehicle speed and transfer case shift posi-
tion messages received by the cluster over the PCI
data bus requires the use of a DRBIII

t scan tool.

Refer to the appropriate diagnostic information.
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 SUPPLEMENTAL RESTRAINT
SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, DRIVER AIRBAG,
PASSENGER AIRBAG, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. DISCON-
NECT AND ISOLATE THE BATTERY NEGATIVE
(GROUND) CABLE, THEN WAIT TWO MINUTES FOR
THE SYSTEM CAPACITOR TO DISCHARGE BEFORE
PERFORMING FURTHER DIAGNOSIS OR SERVICE.
THIS IS THE ONLY SURE WAY TO DISABLE THE
SUPPLEMENTAL RESTRAINT SYSTEM. FAILURE TO
TAKE

THE

PROPER

PRECAUTIONS

COULD

RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.

(1) Disconnect and isolate the battery negative

cable. Remove the rear and front axle locker relays
from their receptacles in the Power Distribution Cen-
ter (PDC). Remove the axle lock switch from the
instrument panel. Disconnect the instrument panel
wire harness connector for the axle lock switch from
the switch connector receptacle. Remove the instru-
ment cluster from the instrument panel.

(2) Check for continuity between each of the rear

and front axle lock request circuit cavities of the
appropriate instrument panel wire harness connec-
tors (Connector C1 for rear, Connector C2 for front)
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 or front axle lock request
circuit between the instrument cluster, the axle lock
switch, and the rear or front axle locker relay as
required.

(3) Check for continuity between each of the rear

and/or front axle lock request circuit cavities of the
instrument panel wire harness connectors (Connector
C1 for rear, Connector C2 for front) for the instru-
ment cluster, the instrument panel wire harness con-
nector for the axle lock switch, and the rear or front
axle locker relay receptacle in the PDC. In each case,
there should be continuity. If OK, go to Step 4. If not
OK, repair the open rear and/or front axle lock
request circuit between the instrument cluster, the
axle lock switch, and the PDC as required.

(4) Check for continuity between the axle lock

switch enable 1 and/or enable 2 circuit cavity of the
instrument panel wire harness connector (Connector
C1 for enable 1, Connector C2 for enable 2) 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 axle lock switch enable 1 or enable
2 circuit between the instrument cluster and the axle
lock switch as required.

(5) Check for continuity between the axle lock

switch enable 1 and/or enable 2 circuit cavities of the
instrument panel wire harness connector (Connector

8J - 14

INSTRUMENT CLUSTER

INSTRUMENT CLUSTER (Continued)

C1 for enable 1, Connector C2 for enable 2) for the
instrument cluster and the instrument panel wire
harness connector for the axle lock switch. There
should be continuity. If OK, go to Step 6. If not OK,
repair the open axle lock switch enable 1 or enable 2
circuit between the instrument cluster and the axle
lock switch as required.

(6) Disconnect the rear and/or front locker indica-

tor switch pigtail harness connector from the rear or
front axle jumper harness connector. Check for conti-
nuity between the ground circuit cavity of the rear or
front axle jumper harness connector and a good
ground. There should be continuity. If OK, go to Step
7. If not OK, repair the open ground circuit between
the rear or front axle jumper harness connector for
the rear or front locker indicator switch and ground
(G105) as required.

(7) Check for continuity between the ground cir-

cuit and the rear or front locker indicator switch
sense circuit cavities of the rear or front locker indi-
cator switch pigtail harness connector. There should
be continuity with the axle locker engaged, and no
continuity with the axle locker disengaged. If OK, go
to Step 8. If not OK, replace the faulty rear or front
locker indicator switch.

(8) Check for continuity between the rear or front

locker indicator switch sense circuit cavity of the rear
or front axle jumper harness connector for the locker
indicator switch and a good ground. There should be
no continuity. If OK, go to Step 9. If not OK, repair
the shorted rear or front locker indicator switch
sense circuit between the rear or front axle jumper
harness connector for the locker indicator switch and
the instrument cluster as required.

(9) Check for continuity between the rear or front

locker indicator switch sense circuit cavities of the
rear or front axle jumper harness connector for the
locker indicator switch and the instrument cluster.
There should be continuity. If OK, use a DRBIII

scan tool to perform additional testing of the instru-
ment cluster. Refer to the appropriate diagnostic
information. If not OK, repair the open rear or front
locker indicator switch sense circuit between the rear
or front axle jumper harness connector for the locker
indicator switch and the instrument cluster 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.

WARNING:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

WHEEL, STEERING COLUMN, AIRBAG, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE SYSTEM CAPACITOR TO DIS-
CHARGE BEFORE PERFORMING FURTHER DIAG-
NOSIS OR SERVICE. THIS IS THE ONLY SURE WAY
TO DISABLE THE SUPPLEMENTAL RESTRAINT
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT.

(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

INSTRUMENT CLUSTER

8J - 15

INSTRUMENT CLUSTER (Continued)

cluster. If not OK, repair the open rear window
defogger relay control circuit between the instrument
cluster and the PDC as required.

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:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

(1) Disconnect and isolate the battery negative

cable. Disconnect the body wire harness connector for
the left multi-function switch from the switch connec-
tor receptacle. Check for continuity between the
ground circuit cavity of the body wire harness con-
nector 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
and a good ground. There should be no continuity. If
OK, go to Step 3. If not OK, repair the shorted panel
lamp dimmer signal circuit between the instrument
cluster and the left multi-function switch as required.

(3) Check for continuity between the panel lamp

dimmer signal circuit cavities of the instrument
panel wire harness connector (Connector C2) for the
instrument cluster and the body wire harness con-
nector for the left multi-function switch. There
should be continuity. If OK, use a DRBIII

t scan tool

to complete the diagnosis of the instrument cluster
illumination lighting. Refer to the appropriate diag-
nostic information. If not OK, repair the open panel
lamp dimmer signal circuit between the instrument
cluster and the left multi-function switch as required.

REMOVAL

WARNING:

AVOID

PERSONAL

INJURY

DEATH, ON VEHICLES EQUIPPED WITH AIRBAGS,
DISABLE THE SUPPLEMENTAL RESTRAINT SYS-
TEM

BEFORE

ATTEMPTING

ANY

STEERING

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the cluster bezel from the instrument

panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - REMOVAL).

(3) Remove the four screws that secure the instru-

ment cluster to the instrument panel structural sup-
port (Fig. 4).

(4) Pull

the

instrument

cluster

rearward

far

enough to access and disconnect the two instrument
panel wire harness connectors for the instrument
cluster from the connector receptacles on the back of
the cluster housing.

(5) Remove the instrument cluster from the instru-

ment panel.

8J - 16

INSTRUMENT CLUSTER

INSTRUMENT CLUSTER (Continued)

Content .. 299 300 301 302 ..