2002 DODGE RAM wheel

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 instrument cluster from the
instrument panel. Move the CTM away from its
mounting bracket far enough to access the instru-
ment panel wire harness connector(s) for the CTM.
Disconnect the instrument panel wire harness con-
nector (Connector C1) from the CTM connector recep-
tacle.
(2) Check for continuity between the tone request
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 tone
request circuit between the instrument cluster and
the CTM as required.
(3) Check for continuity between the tone request
circuit cavities of the instrument panel wire harness
connector (Connector C2) for the instrument cluster
and the instrument panel wire harness connector
(Connector C1) for the CTM. There should be conti-
nuity. If OK, replace the faulty instrument cluster. If
not OK, repair the open tone request circuit between
the instrument cluster and the CTM 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 headlamp switch, that system needs to be
repaired first. (Refer to 8 - ELECTRICAL/LAMPS/
LIGHTING - EXTERIOR/HEADLAMP - DIAGNOSIS
AND TESTING). If no exterior lighting system prob-
lems are found, the following procedure will help
locate a short or open in the cluster illumination
lamp circuit. If the problem being diagnosed involvesa lack of dimming control for the odometer/trip odom-
eter Vacuum Fluorescent Display (VFD), but all of
the other cluster illumination lamps can be dimmed,
test and repair the day brightness circuit between
the instrument cluster and the headlamp switch as
required. Refer to the appropriate wiring informa-
tion. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
details of wire harness routing and retention, connec-
tor 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.
(1) Check the instrument panel dimmer fuse (Fuse
5 - 5 ampere) in the Junction Block (JB). If OK, go to
Step 2. If not OK, repair the shorted circuit or com-
ponent as required and replace the faulty fuse.
(2) Turn the exterior lamps On with the headlamp
switch. Rotate the headlamp switch panel lamps dim-
mer thumbwheel upward to just before the interior
lamps detent. Check for battery voltage at the panel
lamps dimmer fuse (Fuse5-5ampere) in the JB.
Rotate the panel lamps dimmer thumbwheel down-
ward while observing the test voltmeter. The reading
should go from battery voltage to zero volts. If OK,
go to Step 3. If not OK, repair the open panel lamps
dimmer switch signal circuit between the headlamp
switch and the JB as required.
(3) Turn the exterior lamps Off. Disconnect and
isolate the battery negative cable. Remove the instru-
ment cluster. Remove the instrument panel dimmer
fuse (Fuse5-5ampere) from the JB. Probe the
fused panel lamps dimmer switch signal circuit cav-
ity of the instrument panel wire harness connector
(Connector C2) for the instrument cluster. Check for
continuity to a good ground. There should be no con-
tinuity. If OK, go to Step 4. If not OK, repair the
shorted fused panel lamps dimmer switch signal cir-
cuit between the instrument cluster and the JB as
required.
(4) Reinstall the instrument panel dimmer fuse
(Fuse5-5ampere) in the JB. Reconnect the battery
negative cable. Turn the exterior lamps On with the
BR/BEINSTRUMENT CLUSTER 8J - 9
INSTRUMENT CLUSTER (Continued)

headlamp switch. Rotate the headlamp switch panel
lamps dimmer thumbwheel upward to just before the
interior lamps detent. Check for battery voltage at
the fused panel lamps dimmer switch signal circuit
cavity of the instrument panel wire harness connec-
tor (Connector C2) for the instrument cluster. If OK,
replace the faulty bulb and bulb holder units. If not
OK, repair the open fused panel lamps dimmer
switch signal circuit between the instrument cluster
and the JB as required.
REMOVAL
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.
(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 (Fig. 2).(4) If the vehicle is equipped with an automatic
transmission, place the automatic transmission gear
selector lever in the Park position.
(5) Pull the instrument cluster rearward far
enough to disengage the two self-docking instrument
panel wire harness connectors from the cluster con-
nector receptacles.
(6) If the vehicle is equipped with an automatic
transmission, pull the instrument cluster rearward
far enough to access and remove the two screws that
secure the gear selector indicator to the back of the
instrument cluster housing (Fig. 3).
(7) If the vehicle is equipped with an automatic
transmission, disengage the gear selector indicator
from the back of the instrument cluster housing.
(8) Remove the instrument cluster from the instru-
ment panel.
DISASSEMBLY
Some of the components for the instrument cluster
used in this vehicle are serviced individually. The
serviced components include: the automatic transmis-
sion gear selector indicator, the incandescent instru-
ment cluster indicator lamp and illumination lamp
bulbs (including the integral bulb holders), the clus-
ter lens and hood unit, and the cluster housing rear
cover. The remaining components are serviced only
as a part of the cluster housing unit, which includes:
the cluster housing, the electronic circuit board unit,
the cluster overlay, the gauges, and the odometer/trip
odometer reset switch button. Following are the pro-
cedures for disassembling the serviced components
from the instrument cluster unit.
Fig. 2 Instrument Cluster Remove/Install
1 - INSTRUMENT CLUSTER
2 - SCREW
3 - PRNDL CABLE
4 - SELF-DOCKING WIRE HARNESS CONNECTOR
Fig. 3 Gear Selector Indicator Remove/Install
1 - INSTRUMENT CLUSTER
2 - GEAR SELECTOR INDICATOR
3 - SCREW
8J - 10 INSTRUMENT CLUSTERBR/BE
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.
GEAR SELECTOR INDICATOR
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the instrument cluster from the instru-
ment panel. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - REMOVAL).
(3) Remove the steering column opening cover
from the instrument panel. (Refer to 23 - BODY/IN-
STRUMENT PANEL/STEERING COLUMN OPEN-
ING COVER - REMOVAL).
(4) Reach through the instrument panel steering
column opening to access and disengage the loop end
of the gear selector indicator cable from the PRNDL
driver lever on the left side of the steering column
(Fig. 4).(5) Squeeze the sides of the plastic adjuster and
bracket unit to disengage the tabs that secure it to
the sides of the steering column window.
(6) Remove the gear selector indicator mechanism
and cable unit through the instrument panel cluster
opening.
CLUSTER BULB
This procedure applies to each of the incandescent
cluster illumination lamp or indicator lamp bulb and
bulb holder units. However, the illumination lamps
and the indicator lamps use different bulb and bulb
holder unit sizes. They must never be interchanged.
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the instrument cluster from the instru-
ment panel. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - REMOVAL).
(3) Turn the bulb holder counterclockwise about
sixty degrees on the cluster electronic circuit board
(Fig. 5).
(4) Pull the bulb and bulb holder unit straight
back to remove it from the bulb mounting hole in the
cluster electronic circuit board.
CLUSTER LENS AND HOOD
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the instrument cluster from the instru-
ment panel. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - REMOVAL).
Fig. 4 Gear Selector Indicator Cable Remove/Install
1 - STEERING COLUMN
2 - CABLE
3 - LOOP END
4 - LEVER
5 - ADJUSTER AND BRACKET
Fig. 5 Cluster Bulb Remove/Install
1 - INSTRUMENT CLUSTER
2 - BULB AND HOLDER
BR/BEINSTRUMENT CLUSTER 8J - 11
INSTRUMENT CLUSTER (Continued)

(3) Remove the seven screws that secure the lens
and hood unit to the cluster housing (Fig. 6).
(4) Gently pull the lens and hood unit away from
the cluster housing.
CAUTION: Do not touch the face of the gauge over-
lay or the back of the cluster lens with your finger.
It will leave a permanent finger print.
CLUSTER HOUSING REAR COVER
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the instrument cluster from the instru-
ment panel. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - REMOVAL).
(3) Remove the six screws that secure the rear
cover to the back of the cluster housing (Fig. 7).
(4) Remove the rear cover from the back of the
cluster housing.
CLUSTER HOUSING
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the instrument cluster from the instru-
ment panel. (Refer to 8 - ELECTRICAL/INSTRU-
MENT CLUSTER - REMOVAL).
(3) Remove the lens and hood unit from the cluster
housing. Refer to CLUSTER LENS AND HOOD .
(4) Remove the rear cover from the cluster hous-
ing. Refer to CLUSTER HOUSING REAR COVER .
ASSEMBLY
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.
GEAR SELECTOR INDICATOR
(1) Position the gear selector indicator mechanism
and cable unit into the instrument panel cluster
opening.
(2) Route the cable through the instrument panel
and under the steering column to the PRNDL driver
lever on the left side of the steering column.
(3) Squeeze the sides of the plastic adjuster and
bracket unit and engage the tabs that secure it with
the sides of the steering column window.
(4) Engage the loop end of the gear selector indi-
cator cable onto the PRNDL driver lever on the left
side of the steering column (Fig. 4).
(5) Reinstall the instrument cluster onto the
instrument panel. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - INSTALLATION).
(6) Confirm proper operation of the gear selector
indicator. Calibrate the indicator, if required. (Refer
to 19 - STEERING/COLUMN - INSTALLATION).
(7) Reinstall the steering column opening cover
onto the instrument panel. (Refer to 23 - BODY/IN-Fig. 6 Instrument Cluster Components
1 - COVER
2 - HOUSING
3 - MASK AND GAUGES
4 - HOOD
5 - LENS
6 - CIRCUIT BOARD
7 - ODOMETER RESET BUTTON
Fig. 7 Cluster Housing Rear Cover Remove/Install
1 - REAR CLUSTER HOUSING COVER
8J - 12 INSTRUMENT CLUSTERBR/BE
INSTRUMENT CLUSTER (Continued)

STRUMENT PANEL/STEERING COLUMN OPEN-
ING COVER - INSTALLATION).
(8) Reconnect the battery negative cable.
CLUSTER BULB
This procedure applies to each of the incandescent
cluster illumination lamp or indicator lamp bulb and
bulb holder units. However, the illumination lamps
and the indicator lamps use different bulb and bulb
holder unit sizes. They must never be interchanged.
CAUTION: Be certain that any bulb and bulb holder
unit removed from the cluster electronic circuit
board is reinstalled in the correct position. Always
use the correct bulb size and type for replacement.
An incorrect bulb size or type may overheat and
cause damage to the instrument cluster, the elec-
tronic circuit board and/or the gauges.
(1) Insert the bulb and bulb holder unit straight
into the correct bulb mounting hole in the cluster
electronic circuit board (Fig. 5).
(2) With the bulb holder fully seated against the
cluster electronic circuit board, turn the bulb holder
clockwise about sixty degrees to lock it into place.
(3) Reinstall the instrument cluster onto the
instrument panel. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - INSTALLATION).
(4) Reconnect the battery negative cable.
CLUSTER LENS AND HOOD
CAUTION: Do not touch the face of the gauge over-
lay or the back of the cluster lens with your finger.
It will leave a permanent finger print.
(1) Align the cluster lens and hood unit with the
cluster housing. Be certain that the odometer/trip
odometer switch button is installed through the
clearance hole in the lens (Fig. 6).
(2) Install and tighten the seven screws that
secure the lens and hood unit to the cluster housing.
Tighten the screws to 2.2 N´m (20 in. lbs.).
(3) Reinstall the instrument cluster onto the
instrument panel. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - INSTALLATION).
(4) Reconnect the battery negative cable.
CLUSTER HOUSING REAR COVER
(1) Position the rear cover onto the back of the
cluster housing (Fig. 7).
(2) Install and tighten the six screws that secure
the rear cover to the back of the cluster housing.
Tighten the screws to 2.2 N´m (20 in. lbs.).
(3) Reinstall the instrument cluster onto the
instrument panel. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - INSTALLATION).(4) Reconnect the battery negative cable.
CLUSTER HOUSING
(1) Assemble the rear cover onto the cluster hous-
ing. Refer to CLUSTER HOUSING REAR COVER .
(2) Assemble the lens and hood unit onto the clus-
ter housing. Refer to CLUSTER LENS AND HOOD .
(3) Reinstall the instrument cluster onto the
instrument panel. (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - INSTALLATION).
(4) Reconnect the battery negative cable.
INSTALLATION
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) Position the instrument cluster to the instru-
ment panel.
(2) If the vehicle is equipped with an automatic
transmission, position the gear selector indicator onto
the back of the cluster housing (Fig. 3).
(3) If the vehicle is equipped with an automatic
transmission, install and tighten the two screws that
secure the gear selector indicator mechanism to the
back of the cluster housing. Tighten the screws to 2.2
N´m (20 in. lbs.).
(4) Align the instrument cluster with the cluster
opening in the instrument panel and push the cluster
firmly and evenly into place. The instrument panel
wire harness has two self-docking connectors that
will be automatically aligned with, and connected to
the instrument cluster connector receptacles when
the cluster is properly installed in the instrument
panel.
(5) Install and tighten the four screws that secure
the instrument cluster to the instrument panel (Fig.
2). Tighten the screws to 2.2 N´m (20 in. lbs.).
(6) Reinstall the cluster bezel onto the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - INSTALLATION).
(7) If the vehicle is equipped with an automatic
transmission, confirm proper operation of the gear
selector indicator. Calibrate the indicator, if required.
BR/BEINSTRUMENT CLUSTER 8J - 13
INSTRUMENT CLUSTER (Continued)

(Refer to 19 - STEERING/COLUMN - INSTALLA-
TION).
(8) Reconnect the battery negative cable.
NOTE: Some of the indicators in this instrument
cluster are either programmable (upshift indicator)
or automatically configured (cruise, overdrive-off,
and transmission overtemp indicators) when the
cluster is connected to the vehicle electrical sys-
tem. This feature allows those indicator lamps to be
enabled or disabled for compatibility with certain
optional equipment. If a new instrument cluster is
being installed, use a DRBIIITscan tool to program
the instrument cluster with the proper vehicle
equipment option setting to enable and/or disable
the upshift indicator lamp. Refer to the appropriate
diagnostic information.
ABS INDICATOR
DESCRIPTION
An Antilock Brake System (ABS) indicator is stan-
dard equipment on all instrument clusters. This indi-
cator serves both the standard equipment Rear
Wheel Anti-Lock (RWAL) and optional equipment
4-Wheel Anti-Lock (4WAL) brake systems. The ABS
indicator is located near the lower edge of the instru-
ment cluster overlay, to the left of center. The ABS
indicator consists of a stencilled cutout of the Inter-
national Control and Display Symbol icon for ªFail-
ure of Anti-lock Braking Systemº in the opaque layer
of the instrument cluster overlay. The dark outer
layer of the overlay prevents the indicator from being
clearly visible when it is not illuminated. An amber
lens behind the cutout in the opaque layer of the
overlay causes the icon to appear in amber through
the translucent outer layer of the overlay when it is
illuminated from behind by a Light Emitting Diode
(LED) soldered onto the instrument cluster electronic
circuit board. The ABS indicator is serviced as a unit
with the instrument cluster.
OPERATION
The ABS indicator gives an indication to the vehi-
cle operator when the ABS system is faulty or inop-
erative. This indicator is controlled by a transistor on
the instrument cluster circuit board based upon clus-
ter programming and electronic messages received by
the cluster from the Controller Antilock Brake (CAB)
over the Chrysler Collision Detection (CCD) data bus.
The ABS indicator Light Emitting Diode (LED)
receives battery current on the instrument cluster
electronic circuit board through the fused ignition
switch output (st-run) circuit whenever the ignition
switch is in the On or Start positions; therefore, theLED will always be off when the ignition switch is in
any position except On or Start. The LED only illu-
minates when it is provided a path to ground by the
instrument cluster transistor. The instrument cluster
will turn on the ABS indicator for the following rea-
sons:
²Bulb Test- Each time the ignition switch is
turned to the On position the ABS indicator is illu-
minated by the cluster for about two seconds as a
bulb test.
²ABS Lamp-On Message- Each time the clus-
ter receives a lamp-on message from the CAB, the
ABS indicator will be illuminated. The indicator
remains illuminated until the cluster receives a
lamp-off message from the CAB, or until the ignition
switch is turned to the Off position, whichever occurs
first.
²Communication Error- If the cluster receives
no lamp-on or lamp-off messages from the CAB for
six consecutive seconds, the ABS indicator is illumi-
nated. The indicator remains illuminated until the
cluster receives a valid message from the CAB, or
until the ignition switch is turned to the Off position,
whichever occurs first.
²Actuator Test- Each time the instrument clus-
ter is put through the actuator test, the ABS indica-
tor will be turned on during the bulb check portion of
the test to confirm the functionality of the LED and
the cluster control circuitry.
²ABS Diagnostic Test- The ABS indicator is
blinked on and off by lamp-on and lamp-off messages
from the CAB during the performance of the ABS
diagnostic tests.
The CAB continually monitors the ABS circuits
and sensors to decide whether the system is in good
operating condition. The CAB then sends the proper
lamp-on or lamp-off messages to the instrument clus-
ter. If the CAB sends a lamp-on message after the
bulb test, it indicates that the CAB has detected a
system malfunction and/or that the ABS system has
become inoperative. The CAB will store a Diagnostic
Trouble Code (DTC) for any malfunction it detects.
Each time the ABS indicator fails to light due to an
open or short in the cluster ABS indicator circuit, the
cluster sends a message notifying the CAB of the
condition, and the CAB will store a DTC. For proper
diagnosis of the antilock brake system, the CAB, the
CCD data bus, or the message inputs to the instru-
ment cluster that control the ABS indicator, a
DRBIIItscan tool is required. Refer to the appropri-
ate diagnostic information.
8J - 14 INSTRUMENT CLUSTERBR/BE
INSTRUMENT CLUSTER (Continued)

on the instrument cluster circuit board based upon a
hard wired input to the instrument cluster, cluster
programming, and electronic messages received by
the cluster from the Controller Antilock Brake (CAB)
over the Chrysler Collision Detection (CCD) data bus.
The brake indicator Light Emitting Diode (LED)
receives battery current on the instrument cluster
electronic circuit board through the fused ignition
switch output (st-run) circuit whenever the ignition
switch is in the On or Start positions; therefore, the
LED will always be off when the ignition switch is in
any position except On or Start. The LED only illu-
minates when it is provided a path to ground by the
instrument cluster transistor. The instrument cluster
will turn on the brake indicator for the following rea-
sons:
²Bulb Test- Each time the ignition switch is
turned to the On position the brake indicator is illu-
minated by the instrument cluster for about four sec-
onds as a bulb test.
²Park Brake-On- If the park brake is applied
or not fully released with the ignition switch in the
On position, the brake indicator is illuminated solid.
The brake indicator will blink on and off repeatedly
when the park brake is applied or not fully released
and the ignition switch is in the On position if a
vehicle with an automatic transmission is not in
Park or Neutral, or if the engine is running on vehi-
cles with a manual transmission.
²Brake Lamp-On Message- Each time the
cluster receives a lamp-on message from the CAB,
the brake indicator will be illuminated. The indicator
remains illuminated until the cluster receives a
lamp-off message from the CAB, or until the ignition
switch is turned to the Off position, whichever occurs
first.
²Actuator Test- Each time the instrument clus-
ter is put through the actuator test, the brake indi-
cator will be turned on during the bulb check portion
of the test to confirm the functionality of the LED
and the cluster control circuitry.
The park brake switch on the park brake pedal
mechanism provides a hard wired ground input to
the instrument cluster circuitry through the park
brake switch sense circuit whenever the park brake
is applied or not fully released. The CAB continually
monitors the brake pressure switch on the brake
combination valve to determine if the pressures in
the two halves of the split brake hydraulic system
are unequal. The CAB then sends the proper lamp-on
or lamp-off messages to the instrument cluster. If the
CAB sends a lamp-on message after the bulb test, it
indicates that the CAB has detected a brake hydrau-
lic system malfunction and/or that the ABS system
has become inoperative. The CAB will store a Diag-
nostic Trouble Code (DTC) for any malfunction itdetects. The park brake switch input to the instru-
ment cluster can be diagnosed using conventional
diagnostic tools and methods. For proper diagnosis of
the antilock brake system, the CAB, the CCD data
bus, or the message inputs to the instrument cluster
that control the brake indicator, a DRBIIItscan tool
is required. Refer to the appropriate diagnostic infor-
mation.
DIAGNOSIS AND TESTING - BRAKE INDICATOR
The diagnosis found here addresses an inoperative
brake indicator condition. If the brake indicator
comes on or stays on with the ignition switch in the
On position and the park brake released, or comes on
while driving, the brake system must be diagnosed
and repaired prior to performing the following tests.
(Refer to 5 - BRAKES - DIAGNOSIS AND TEST-
ING). If no brake system problem is found, the fol-
lowing procedure will help locate a faulty park brake
switch or park brake switch sense circuit. Refer to
the appropriate wiring information. The wiring infor-
mation 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 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 instrument panel wire harness
connector for the park brake switch from the switch
terminal. 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 2. If not OK, adjust or replace the
faulty park brake switch.
(2) Remove the instrument cluster from the instru-
ment panel. With the park brake switch still discon-
nected, check for continuity between the park brake
switch sense circuit cavity of the instrument panel
wire harness connector for the park brake switch and
a good ground. There should be no continuity. If OK,
go to Step 3. If not OK, repair the shorted park
8J - 16 INSTRUMENT CLUSTERBR/BE
BRAKE/PARK BRAKE INDICATOR (Continued)

high beam indicator. If no headlamp system problems
are found, the following procedure will help locate a
short or open in the high beam indicator circuit.
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.
INDICATOR DOES NOT ILLUMINATE WITH HIGH BEAMS
SELECTED
(1) Check the fused B(+) fuse (Fuse 14 - 10
ampere) in the Junction Block (JB). 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 battery voltage at the fused B(+) fuse
(Fuse 14 - 10 ampere) in the JB. If OK, go to Step 3.
If not OK, repair the open fused B(+) circuit between
the JB and the Power Distribution Center (PDC) as
required.
(3) Be certain that the headlamp high beams are
selected with the headlamp beam select switch by
turning the headlamp switch to the On position, pull-
ing the multi-function switch stalk toward the steer-
ing wheel, then inspecting the headlamps at the
front of the vehicle. Once the headlamp high beams
are selected, turn the headlamp switch to the Off
position. Disconnect and isolate the battery negative
cable. Remove the instrument cluster from the
instrument panel. Reconnect the battery negative
cable. Check for battery voltage at the fused B(+) cir-
cuit cavity of the instrument panel wire harness con-
nector (Connector C1) for the instrument cluster. If
OK, go to Step 4. If not OK, repair the open fused
B(+) circuit between the instrument cluster and the
JB as required.
(4) Disconnect and isolate the battery negative
cable. Check for continuity between the high beam
indicator driver circuit cavity of the instrument panel
wire harness connector (Connector C2) for the instru-ment cluster and a good ground. There should be
continuity. If OK, replace the faulty headlamp high
beam indicator bulb and bulb holder unit. If not OK,
repair the open high beam indicator driver circuit
between the instrument cluster and the headlamp
beam select (multi-function) switch as required.
INDICATOR STAYS ILLUMINATED WITH HIGH BEAMS NOT
SELECTED
(1) Be certain that the headlamp low beams are
selected with the headlamp beam select switch by
turning the headlamp switch to the On position, pull-
ing the multi-function switch stalk toward the steer-
ing wheel, then inspecting the headlamps at the
front of the vehicle. Once the headlamp low beams
are selected, turn the headlamp switch to the Off
position. Disconnect and isolate the battery negative
cable. Remove the instrument cluster from the
instrument panel. Check for continuity between the
high beam indicator driver 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, replace the
faulty instrument cluster. If not OK, repair the
shorted high beam indicator driver circuit between
the instrument cluster and the headlamp beam select
(multi-function) switch as required.
LOW FUEL INDICATOR
DESCRIPTION
A low fuel indicator is standard equipment on all
instrument clusters. The low fuel indicator is located
near the lower edge of the instrument cluster overlay,
to the right of center. The low fuel indicator consists
of a stenciled cutout of the International Control and
Display Symbol icon for ªFuelº in the opaque layer of
the instrument cluster overlay. The dark outer layer
of the overlay prevents the indicator from being
clearly visible when it is not illuminated. An amber
lens behind the cutout in the opaque layer of the
overlay causes the icon to appear in amber through
the translucent outer layer of the overlay when the
indicator is illuminated from behind by a Light Emit-
ting Diode (LED) soldered onto the instrument clus-
ter electronic circuit board. The low fuel indicator is
serviced as a unit with the instrument cluster.
OPERATION
The low fuel indicator gives an indication to the
vehicle operator when the level of fuel in the fuel
tank becomes low. This indicator is controlled by a
transistor on the instrument cluster circuit board
based upon cluster programming and electronic mes-
sages received by the cluster from the Powertrain
Control Module (PCM) over the Chrysler Collision
8J - 22 INSTRUMENT CLUSTERBR/BE
HIGH BEAM INDICATOR (Continued)