Jeep XJ User Manual

INSTRUMENT PANEL SYSTEMS

CONTENTS

page page

DESCRIPTION AND OPERATION

CIGAR LIGHTER RELAY ................... 4

INSTRUMENT CLUSTER ................... 2

INSTRUMENT PANEL ..................... 1

INSTRUMENT PANEL CIGAR LIGHTER ....... 3

INSTRUMENT PANEL POWER OUTLET ....... 4

INSTRUMENT PANEL SYSTEM ............. 1

DIAGNOSIS AND TESTING

CIGAR LIGHTER RELAY .................. 12

INSTRUMENT CLUSTER ................... 5

INSTRUMENT PANEL CIGAR LIGHTER ...... 11

INSTRUMENT PANEL POWER OUTLET ...... 12

REMOVAL AND INSTALLATION

CIGAR LIGHTER RELAY .................. 15

CLUSTER BEZEL ........................ 16

GLOVE BOX ........................... 22

GLOVE BOX COMPONENTS ............... 22

GLOVE BOX LATCH STRIKER ............. 24

HEADLAMP SWITCH .................... 17

INSTRUMENT CLUSTER .................. 18

INSTRUMENT CLUSTER COMPONENTS ..... 18

INSTRUMENT PANEL ACCESSORY SWITCH

BEZEL .............................. 15

INSTRUMENT PANEL ASSEMBLY .......... 26

INSTRUMENT PANEL CENTER BEZEL ....... 14

INSTRUMENT PANEL CENTER SUPPORT

BRACKET ............................ 25

INSTRUMENT PANEL END CAP ............ 24

INSTRUMENT PANEL TOP COVER .......... 21

KNEE BLOCKER ........................ 13

STEERING COLUMN OPENING COVER ...... 13

DESCRIPTION AND OPERATION

INSTRUMENT PANEL SYSTEM

DESCRIPTION

The instrument panel serves as the command cen­ter of the vehicle, which necessarily makes it a very
complex unit. The instrument panel is designed to
house the controls and monitors for standard and
optional powertrains, climate control systems, audio
systems, lighting systems, safety systems and many
other comfort or convenience items. The instrument
panel is also designed so that all of the various con­trols can be safely reached and the monitors can be
easily viewed by the vehicle operator when driving,
while still allowing relative ease of access to each of
these items for service. See the owner’s manual in
the vehicle glove box for more information on the fea­tures, use and operation of all of the instrument
panel components and systems.

This group is responsible for covering service infor­mation for the vehicle instrument panel systems.
However, complete service information coverage for
all of the systems and components housed in the
instrument panel in a single section of the service
manual would not be practical. Therefore, the service
information for any component will be found in the
group designated to cover the vehicle system that the
component belongs to, even though the component is

mounted on or in the instrument panel. If you cannot
locate a listing for the component or system you are
servicing in the table of contents for this group, or if
you are uncertain as to which vehicle system a com­ponent belongs to, it is suggested that you refer to
the alphabetical Component and System Index
found at the back of this service manual.

NOTE: This group covers both Left-Hand Drive
(LHD) and Right-Hand Drive (RHD) versions of this
model. Whenever required and feasible, the RHD
versions of affected vehicle components have been
constructed as mirror-image of the LHD versions.
While most of the illustrations used in this group
represent only the LHD version, the diagnostic and
service procedures outlined can generally be
applied to either version. Exceptions to this rule
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required.

INSTRUMENT PANEL

DESCRIPTION

This instrument panel uses a full-width structural
plastic foundation as its primary support. When the
two primary molded plastic components of this struc­ture are vibration welded together they provide supe­rior instrument panel stiffness and integrity to help

XJ INSTRUMENT PANEL SYSTEMS 8E - 1

reduce buzzes, squeaks, and rattles even on the
bumpiest roads.

This type of construction also provides improved
energy absorption which, in conjunction with the
dual airbag modules and seat belts, helps to improve
occupant protection. This foundation structure also
serves as the air duct for the heating and air condi­tioning system panel outlets, which greatly reduces
the number of components used over conventional
instrument panel construction.

Modular instrument panel construction allows all
of the gauges and controls to be serviced from the
front of the panel. In addition, most of the instru­ment panel electrical components can be accessed
without complete instrument panel removal. If neces­sary, the instrument panel can be removed from the
vehicle as an assembly.

Removal of the steering column opening cover and
knee blocker provides access to the steering column
mounts, the steering column wiring, the headlamp
switch, the electronic combination flasher, and much
of the instrument panel wiring. Removal of the glove
box provides access to the heating and air condition­ing electrical and vacuum harnesses, the blower
motor relay, the radio antenna coaxial cable, the
lower passenger side airbag mounts, and additional
instrument panel wiring.

Removal of the instrument panel center bezel
allows access to the radio, the heating and air condi­tioning controls, the accessory switches, the cigar
lighter, and the accessory power outlet. Removal of
the instrument cluster bezel allows access to the
instrument cluster. Removal of the cluster assembly
allows access to the cluster illumination and indica­tor lamp bulbs, and more of the instrument panel
wiring.

Removal of the instrument panel top cover allows
access to the upper passenger side airbag mounts.
Instrument panel removal is required for service of
most internal components of the heating and air con­ditioning system housing.

INSTRUMENT CLUSTER

DESCRIPTION

Two basic instrument clusters are offered on this
model: low-line, or high-line. Both clusters are elec­tromechanical units that utilize integrated circuitry
and information carried on the Chrysler Collision
Detection (CCD) data bus network for control of all
gauges and many of the indicator lamps. These clus­ters also incorporate a digital Vacuum Fluorescent
Display (VFD) for the odometer/trip odometer display
functions. Some variations of each cluster exist due
to optional equipment and regulatory requirements.

The low-line cluster includes the following analog

gauges:

• Fuel gauge

• Speedometer.

This cluster also includes provisions for the follow-

ing indicator lamps:

• Airbag indicator lamp

• Anti-lock brake system lamp

• Brake warning lamp

• Coolant temperature warning lamp

• Cruise-on indicator lamp

• Four-wheel drive (Part Time and/or Full Time)

indicator lamps

• Headlamp high beam indicator lamp

• Low oil pressure warning lamp

• Low washer fluid warning lamp

• Malfunction indicator (Check Engine) lamp

• Seat belt reminder lamp

• Sentry Key Immobilizer System (SKIS) indicator

lamp

• Turn signal indicator lamps

• Upshift indicator lamp (manual transmission)

• Voltage warning lamp.

The high-line cluster replaces some of the indicator
lamps found in the low-line cluster with analog
gauges. The high-line cluster includes the following
analog gauges:

• Coolant temperature gauge

• Fuel gauge

• Oil pressure gauge

• Speedometer

• Tachometer

• Voltmeter.

The high-line cluster also adds a check gauges
lamp and a low fuel warning lamp to the remaining
indicator lamps found in the low-line cluster.

Both instrument clusters feature circuitry that has
a self-diagnostic actuator test capability, which will
test each of the CCD bus message-controlled func­tions of the cluster by lighting the appropriate indi­cator lamps and positioning the gauge needles at
several predetermined locations on the gauge faces in
a prescribed sequence. For more information on this
function, refer to Instrument Cluster in the Diag­nosis and Testing section of this group.

The instrument cluster circuitry also integrates a
chime tone generator and a timer circuit. These
items replace the chime or buzzer module, and the
separate timer circuit for the rear window defogger
system. Refer to Chime Warning System in the
Description and Operation section of Group 8U ­Chime/Buzzer Warning Systems for more information
on the chime functions of the instrument cluster.
Refer to Rear Window Defogger System in the
Description and Operation section of Group 8N -

8E - 2 INSTRUMENT PANEL SYSTEMS XJ

DESCRIPTION AND OPERATION (Continued)

Electrically Heated Systems for more information on
the timer function of the instrument cluster.

The instrument clusters for this model are serviced
only as complete units. If a cluster gauge or the clus­ter circuit board are faulty, the entire cluster must be
replaced. The cluster lens, the cluster hood and
mask, the rear cluster housing cover, the odometer
reset knob boot and the incandescent lamp bulbs and
holders are available for service replacement.

OPERATION

GAUGE

With the ignition switch in the On or Start posi­tions, voltage is supplied to all gauges through the
instrument cluster electronic circuit board. With the
ignition switch in the Off position, voltage is not sup­plied to the gauges. The gauges do not accurately
indicate any vehicle condition unless the ignition
switch is in the On or Start positions.

All of the instrument cluster gauges, except the
odometer, are air core magnetic units. Two fixed elec­tromagnetic coils are located within the gauge. These
coils are wrapped at right angles to each other
around a movable permanent magnet. The movable
magnet is suspended within the coils on one end of a
shaft. The gauge needle is attached to the other end
of the shaft.

One of the coils has a fixed current flowing
through it to maintain a constant magnetic field
strength. Current flow through the second coil
changes, which causes changes in its magnetic field
strength. The current flowing through the second coil
is changed by the instrument cluster electronic cir­cuitry in response to messages received on the
Chrysler Collision Detection (CCD) data bus network.

The gauge needle moves as the movable permanent
magnet aligns itself to the changing magnetic fields
created around it by the electromagnets. The instru­ment cluster circuitry is programmed to move all of
the gauge needles back to the low end of their respec­tive scales after the ignition switch is turned to the
Off position.

INDICATOR LAMP

Indicator lamps are located in the instrument clus­ter and are served by the cluster circuit board and
connectors. Many of the indicator lamps in the
instrument cluster are controlled by the instrument
cluster circuitry in response to messages received
over the Chrysler Collision Detection (CCD) data bus
network.

The anti-lock brake system lamp, brake warning
lamp, four-wheel drive indicator lamps, headlamp
high beam indicator lamp, low washer fluid warning
lamp and turn signal indicator lamps are hard wired.

The seat belt reminder lamp is controlled by the
instrument cluster programming. The instrument
cluster circuitry uses CCD data bus messages from
the Powertrain Control Module (PCM), Airbag Con­trol Module (ACM), and the Sentry Key Immobilizer
Module (SKIM) to control all of the remaining indi­cator lamps.

Each of the indicator lamps in the instrument clus­ter uses incandescent bulbs and holders, which are
available for service replacement.

CLUSTER ILLUMINATION LAMP

The cluster illumination lamps are hard wired in
the instrument cluster. When the park or head lamps
are turned on, the cluster illumination lamps light.
Illumination brightness is adjusted by rotating the
headlamp switch knob (clockwise to dim, counter­clockwise to brighten). The instrument cluster illumi­nation lamps receive battery feed from the panel
dimmer rheostat in the headlamp switch through a
fuse in the fuseblock module.

The instrument cluster electronic circuitry also
monitors the cluster illumination lamp dimming level
whenever the park or head lamps are turned on. The
instrument cluster electronic circuitry responds by
adjusting the dimming level of the odometer Vacuum
Fluorescent Display (VFD), and sending dimming
level messages over the Chrysler Collision Detection
(CCD) data bus network. When the park lamps or
headlamps are turned off, the VFD is illuminated at
full brightness for improved daylight visibility.

Each of the cluster illumination lamps is located on
the instrument cluster circuit board. Each cluster
illumination lamp has a replaceable bulb and bulb
holder.

INSTRUMENT PANEL CIGAR LIGHTER

DESCRIPTION

A cigar lighter is standard equipment on this
model. The cigar lighter is installed in the instru­ment panel accessory switch bezel, which is located
near the bottom of the instrument panel center bezel
area, below the heater and air conditioner controls.
The cigar lighter base is secured by a snap fit within
the accessory switch bezel.

The cigar lighter receptacle is serviced only as a
part of the accessory switch bezel unit. If the cigar
lighter base is faulty or damaged, the accessory
switch bezel unit must be replaced. The cigar lighter
knob and heating element unit is available for ser­vice. This component cannot be repaired and, if
faulty or damaged, it must be replaced.

XJ INSTRUMENT PANEL SYSTEMS 8E - 3

DESCRIPTION AND OPERATION (Continued)

OPERATION

The cigar lighter consists of two major components:
a knob and heating element unit, and the cigar
lighter base or receptacle shell. The receptacle shell
is connected to ground, and an insulated contact in
the bottom of the shell is connected to battery cur­rent. The cigar lighter receives battery voltage from a
fuse in the junction block through the cigar lighter
relay only when the ignition switch is in the Acces­sory or On positions. Refer to Cigar Lighter Relay
in the Description and Operation section of this
group for more information on this component.

The cigar lighter knob and heating element are
encased within a spring-loaded housing, which also
features a sliding protective heat shield. When the
knob and heating element are inserted in the recep­tacle shell, the heating element resistor coil is
grounded through its housing to the receptacle shell.
If the cigar lighter knob is pushed inward, the heat
shield slides up toward the knob exposing the heat­ing element, and the heating element extends from
the housing toward the insulated contact in the bot­tom of the receptacle shell.

Two small spring-clip retainers are located on
either side of the insulated contact inside the bottom
of the receptacle shell. These clips engage and hold
the heating element against the insulated contact
long enough for the resistor coil to heat up. When the
heating element is engaged with the contact, battery
current can flow through the resistor coil to ground,
causing the resistor coil to heat.

When the resistor coil becomes sufficiently heated,
excess heat radiates from the heating element caus­ing the spring-clips to expand. Once the spring-clips
expand far enough to release the heating element,
the spring-loaded housing forces the knob and heat­ing element to pop back outward to their relaxed
position. When the cigar lighter knob and element
are pulled out of the receptacle shell, the protective
heat shield slides downward on the housing so that
the heating element is recessed and shielded around
its circumference for safety.

CIGAR LIGHTER RELAY

DESCRIPTION

The cigar lighter relay is an electromechanical
device that switches fused battery current to the
cigar lighter when the ignition switch is turned to
the Accessory or On positions. The cigar lighter relay
is located in the junction block, on the right cowl side
panel below the instrument panel in the passenger
compartment.

The cigar lighter relay is a International Standards
Organization (ISO) relay. Relays conforming to the
ISO specifications have common physical dimensions,

current capacities, terminal patterns, and terminal
functions.

The cigar lighter relay cannot be repaired or
adjusted and, if faulty or damaged, it must be
replaced.

OPERATION

The ISO relay consists of an electromagnetic coil, a
resistor or diode, and three (two fixed and one mov­able) electrical contacts. The movable (common feed)
relay contact is held against one of the fixed contacts
(normally closed) by spring pressure. When the elec­tromagnetic coil is energized, it draws the movable
contact away from the normally closed fixed contact,
and holds it against the other (normally open) fixed
contact.

When the electromagnetic coil is de-energized,
spring pressure returns the movable contact to the
normally closed position. The resistor or diode is con­nected in parallel with the electromagnetic coil in the
relay, and helps to dissipate voltage spikes that are
produced when the coil is de-energized.

INSTRUMENT PANEL POWER OUTLET

DESCRIPTION

An accessory power outlet is standard equipment
on this model. The power outlet is installed in the
instrument panel accessory switch bezel, which is
located near the bottom of the instrument panel cen­ter bezel area, below the heater and air conditioner
controls. The power outlet base is secured by a snap
fit within the accessory switch bezel. A plastic protec­tive cap snaps into the power outlet base when the
power outlet is not being used, and hangs from the
power outlet base mount by an integral bail strap
while the power outlet is in use.

The power outlet receptacle unit and the accessory
power outlet protective cap are serviced only as a
part of the accessory switch bezel unit. If the power
outlet base is faulty or damaged, the entire accessory
switch bezel unit must be replaced.

OPERATION

The power outlet base or receptacle shell is con­nected to ground, and an insulated contact in the
bottom of the shell is connected to battery current.
The power outlet receives battery voltage from a fuse
in the junction block at all times.

While the power outlet is very similar to a cigar
lighter base unit, it does not include the two small
spring-clip retainers inside the bottom of the recepta­cle shell that are used to secure the cigar lighter
heating element to the insulated contact.

8E - 4 INSTRUMENT PANEL SYSTEMS XJ

DESCRIPTION AND OPERATION (Continued)

DIAGNOSIS AND TESTING

INSTRUMENT CLUSTER

If all of the gauges and/or indicator lamps are inop­erative, perform the Preliminary Diagnosis. If an
individual gauge or Chrysler Collision Detection
(CCD) data bus message-controlled indicator lamp is
inoperative, go directly to the Actuator Test. If an
individual hard wired indicator lamp is inoperative,
refer to Instrument Cluster - Hard Wired Lamp
Diagnosis in the Diagnosis and Testing section of
this group for the procedures to diagnosis that lamp.
For complete circuit diagrams, refer to Instrument
Cluster in the Contents of Group 8W - Wiring Dia­grams.

WARNING: ON VEHICLES EQUIPPED WITH AIR­BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

PRELIMINARY DIAGNOSIS

(1) If the indicator lamps operate, but none of the
gauges operate, go to Step 2. If all of the gauges and
the data bus message-controlled indicator lamps are
inoperative, go to Step 5.

(2) Check the fused B(+) fuse in the Power Distri­bution Center (PDC). If OK, go to Step 3. If not OK,
repair the shorted circuit or component as required
and replace the faulty fuse.

(3) Check for battery voltage at the fused B(+) fuse
in the PDC. If OK, go to Step 4. If not OK, repair the
open fused B(+) circuit to the battery as required.

(4) Disconnect and isolate the battery negative
cable. Remove the instrument cluster. Connect the
battery negative cable. Check for battery voltage at
the fused B(+) circuit cavity of the instrument cluster
wire harness connector A. If OK, refer to Instru-
ment Cluster - Actuator Test in the Diagnosis and
Testing section of this group. If not OK, repair the
open fused B(+) circuit to the fuse in the PDC as
required.

(5) Check the fused ignition switch output (run/
start) fuse in the junction block. If OK, go to Step 6.
If not OK, repair the shorted circuit or component as
required and replace the faulty fuse.

(6) Turn the ignition switch to the On position and
check for battery voltage at the fused ignition switch
output (run/start) fuse in the junction block. If OK,
go to Step 7. If not OK, repair the open fused ignition

switch output (run/start) circuit to the ignition switch
as required.

(7) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Install the instrument cluster. Connect the battery
negative cable. Turn the ignition switch to the On
position. Set the park brake. The red brake warning
lamp should light. If OK, go to Step 8. If not OK, go
to Step 9.

(8) Turn the ignition switch to the Off position.
Turn on the park lamps and adjust the panel lamps
dimmer rheostat in the headlamp switch to the full
bright position. The cluster illumination lamps
should light. If OK, refer to Instrument Cluster -
Actuator Test in the Diagnosis and Testing section
of this group. If not OK, go to Step 10.

(9) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster. Connect the battery
negative cable. Turn the ignition switch to the On
position. Check for battery voltage at the fused igni­tion switch output (run/start) circuit cavity of the
instrument cluster wire harness connector A. If OK,
refer to Instrument Cluster - Actuator Test in the
Diagnosis and Testing section of this group. If not
OK, repair the open fused ignition switch output
(run/start) circuit to the fuse in the junction block as
required.

(10) Disconnect and isolate the battery negative
cable. Remove the instrument cluster. Check for con­tinuity between the ground circuit cavity of the
instrument cluster wire harness connector A and a
good ground. There should be continuity. If OK, refer
to Instrument Cluster - Actuator Test in the
Diagnosis and Testing section of this group. If not
OK, repair the open ground circuit to ground as
required.

ACTUATOR TEST

The instrument cluster actuator test will put the
instrument cluster into its self-diagnostic mode. In
this mode the instrument cluster can perform a self­diagnostic test that will confirm that the instrument
cluster circuitry, the gauges, and the CCD data bus
message controlled indicator lamps are capable of
operating as designed. During the actuator test the
instrument cluster circuitry will position each of the
gauge needles at various specified calibration points,
and turn all of the CCD data bus message-controlled
lamps on and off at specified time intervals (Fig. 1)
or (Fig. 2).

Successful completion of the actuator test will con­firm that the instrument cluster is operational. How­ever, there may still be a problem with the CCD data
bus, the Powertrain Control Module (PCM), the Air­bag Control Module (ACM), the Sentry Key Immobi-

XJ INSTRUMENT PANEL SYSTEMS 8E - 5

lizer Module (SKIM) or the inputs to one of these
electronic control modules. Use a DRB scan tool and
the proper Diagnostic Procedures manual for testing
of these components.

If an individual gauge does not respond properly,
or does not respond at all during the actuator test,
the instrument cluster should be removed. However,
check that the gauge mounting screws on the instru­ment cluster electronic circuit board for proper tight­ness before considering instrument cluster
replacement. If the gauge mounting screws check
OK, replace the faulty cluster.

If an individual indicator lamp does not illuminate
during the actuator test, the instrument cluster
should be removed. However, check that the incan­descent lamp bulb is not faulty and that the bulb
holder is properly installed on the instrument cluster
electronic circuit board before considering instrument
cluster replacement. If the bulb and bulb holder
check OK, replace the faulty instrument cluster.

(1) Begin the test with the ignition switch in the
Off position.

(2) Depress the trip odometer reset button.

(3) While holding the trip odometer reset button
depressed, turn the ignition switch to the On posi­tion, but do not start the engine.

(4) Release the trip odometer reset button.

(5) Compare the operation of the suspect gauge(s)
and/or indicator lamp(s) with the Instrument Cluster
Actuator Test chart (Fig. 1) or (Fig. 2).

(6) The instrument cluster will automatically exit
the self-diagnostic 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 on the
CCD data bus during the test.

(7) Go back to Step 1 to repeat the test, if
required.

HARD WIRED LAMP DIAGNOSIS

Each of the lamps found in this section depends
upon a hard wired circuit input to the instrument
cluster for proper operation. The following procedures
will help to diagnose conditions that may cause an
inoperative hard wired lamp circuit condition.

WARNING: ON VEHICLES EQUIPPED WITH AIR­BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE­CAUTIONS COULD RESULT IN ACCIDENTAL AIR­BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.

ANTI-LOCK BRAKE SYSTEM LAMP

The diagnosis found here addresses an inoperative
Anti-lock Brake System (ABS) lamp condition. If the
ABS lamp stays on with the ignition switch in the
On position, or comes on and stays on while driving,
refer to Antilock Brakes in the Diagnosis and Test­ing section of Group 5 - Brakes for diagnosis. If no
ABS problem is found, the following procedure will
help locate a short or open in the ABS lamp circuit.
For complete circuit descriptions, refer to Instru-
ment Cluster in the Contents of Group 8W - Wiring
Diagrams.

(1) Check the fused ignition switch output (run/
start) fuse in the junction block. If OK, go to Step 2.
If not OK, repair the shorted circuit or component as
required and replace the faulty fuse.

(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/start) fuse in the junction block. If OK,
go to Step 3. If not OK, repair the open fused ignition
switch output (run/start) circuit to the ignition switch
as required.

(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster. Connect the battery
negative cable. Turn the ignition switch to the On
position and within five seconds check for continuity
between the ABS warning indicator driver circuit
cavity of the instrument cluster wire harness connec­tor A and a good ground. There should be continuity
for five seconds after ignition On, and then an open
circuit. If OK, replace the faulty bulb. If not OK, go
to Step 4.

(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the Controller Anti-lock Brake (CAB) wire
harness connector. Check for continuity between the
ABS warning indicator driver circuit cavity of the
instrument cluster wire harness connector A and a
good ground. There should be no continuity. If OK, go
to Step 5. If not OK, repair the shorted ABS warning
indicator driver circuit as required.

(5) Check for continuity between the ABS warning
indicator driver circuit cavities of the instrument
cluster wire harness connector A and the CAB wire
harness connector. There should be continuity. If OK,
refer to Antilock Brakes in the Diagnosis and Test­ing section of Group 5 - Brakes for diagnosis of the
CAB. If not OK, repair the open ABS warning indi­cator driver circuit as required.

BRAKE WARNING LAMP

The diagnosis found here addresses an inoperative
brake warning lamp condition. If the brake warning
lamp stays on with the ignition switch in the On
position and the park brake released, or comes on

8E - 6 INSTRUMENT PANEL SYSTEMS XJ

DIAGNOSIS AND TESTING (Continued)

Fig. 1 Low-Line Instrument Cluster Actuator Test

XJ INSTRUMENT PANEL SYSTEMS 8E - 7

DIAGNOSIS AND TESTING (Continued)

Fig. 2 High-Line Instrument Cluster Actuator Test

8E - 8 INSTRUMENT PANEL SYSTEMS XJ

DIAGNOSIS AND TESTING (Continued)

while driving, refer Base Brake System for vehicles
not equipped with the four wheel anti-lock brake sys­tem, or refer to Antilock Brakes for vehicles
equipped with the four wheel anti-lock brake system
in the Diagnosis and Testing section of Group 5 ­Brakes for further diagnosis. If no brake system
problem is found, the following procedure will help
locate a short or open circuit, or a faulty switch. For
complete circuit diagrams, refer to Instrument
Cluster in the Contents of Group 8W - Wiring Dia­grams.

(1) Check the fused ignition switch output (run/
start) fuse in the junction block. If OK, go to Step 2.
If not OK, repair the shorted circuit or component as
required and replace the faulty fuse.

(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/start) fuse in the junction block. If OK,
go to Step 3. If not OK, repair the open fused ignition
switch output (run/start) circuit to the ignition switch
as required.

(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the wire harness connector at the park
brake switch. With the park brake released, check for
continuity between the park brake switch terminal
and a good ground. There should be no continuity. If
OK, go to Step 4. If not OK, adjust or replace the
faulty park brake switch.

(4) Disconnect the wire harness connector at the
brake warning switch. Check for continuity between
the two terminals of the brake warning switch. There
should be continuity. If OK, go to Step 5. If not OK,
replace the faulty brake warning switch.

(5) Check for continuity between each of the two
brake warning switch terminals and a good ground.
In each case, there should be no continuity. If OK, go
to Step 6. If not OK, replace the faulty brake warn­ing switch.

(6) With both the park brake switch and the brake
warning switch wire harness connectors still discon­nected, check for continuity between the red brake
warning indicator driver circuit cavity of the park
brake switch wire harness connector and a good
ground. There should be no continuity. If OK, go to
Step 7. If not OK, repair the shorted red brake warn­ing indicator driver circuit as required.

(7) With the ignition switch held in the Start posi­tion, check for continuity between the red brake
warning indicator driver circuit cavity of the park
brake switch wire harness connector and a good
ground. There should be continuity. If OK, go to Step

8. If not OK, repair the open red brake warning indi­cator driver circuit to the ignition switch as required.

(8) Turn the ignition switch to the Off position.
Remove the instrument cluster. Check for continuity

between the red brake warning indicator driver cir­cuit cavity of the instrument cluster wire harness
connector A and a good ground. There should be no
continuity. If OK, go to Step 9. If not OK, repair the
shorted red brake warning indicator driver circuit as
required.

(9) Check for continuity between the red brake
warning indicator driver circuit cavities of the instru­ment cluster wire harness connector A and the brake
warning switch wire harness connector. There should
be continuity. If OK, replace the faulty bulb. If not
OK, repair the open red brake warning indicator
driver circuit as required.

FOUR-WHEEL DRIVE INDICATOR LAMP - FULL TIME

The diagnosis found here addresses an inoperative
four-wheel drive indicator lamp condition. If the
problem being diagnosed is related to lamp accuracy,
be certain to confirm that the problem is with the
lamp or switch and not with a damaged or inopera­tive transfer case or transfer case linkage. Refer to
NV242 Diagnosis in the Diagnosis and Testing sec­tion of Group 21 - Transmission for more informa­tion. If no transfer case problem is found, the
following procedure will help locate a short or open
in the indicator lamp circuit. For complete circuit
diagrams, refer to Instrument Cluster in the Con­tents of Group 8W - Wiring Diagrams.

(1) Check the fused ignition switch output (run/
start) fuse in the junction block. If OK, go to Step 2.
If not OK, repair the shorted circuit or component as
required and replace the faulty fuse.

(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/start) fuse in the junction block. If OK,
go to Step 3. If not OK, repair the open fused ignition
switch output (run/start) circuit to the ignition switch
as required.

(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Disconnect the transfer case switch wire harness con­nector. Check for continuity between the ground cir­cuit cavity of the transfer case switch wire harness
connector and a good ground. There should be conti­nuity. If OK, go to Step 4. If not OK, repair the open
ground circuit to ground as required.

(4) Connect the battery negative cable. Turn the
ignition switch to the On position. Install a jumper
wire between the full time four wheel drive indicator
lamp driver circuit cavity of the transfer case switch
wire harness connector and a good ground. The full
time four-wheel drive indicator lamp should light. If
OK, replace the faulty transfer case switch. If not
OK, go to Step 5.

(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.

XJ INSTRUMENT PANEL SYSTEMS 8E - 9

DIAGNOSIS AND TESTING (Continued)