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Dodge Dakota (R1). Manual - part 320

with the headlamp switch. The illumination bright-
ness of these lamps is adjusted by the panel lamps
dimmer rheostat when the headlamp switch thumb-
wheel is rotated (down to dim, up to brighten). The
illumination lamps receive battery current through
the panel lamps dimmer rheostat and a fuse in the
JB on a fused panel lamps dimmer switch signal cir-
cuit. The illumination lamps are grounded at all
times.

In addition, an analog/digital (A/D) converter in

the EMIC converts the analog panel lamps dimmer
rheostat input from the headlamp switch to a digital
dimming level signal for controlling the lighting level
of the VFD. The EMIC also broadcasts this digital
dimming information as a message over the PCI data
bus for use by the Compass Mini-Trip Computer
(CMTC) in synchronizing the lighting level of its
VFD with that of the EMIC. The headlamp switch
thumbwheel also has a Parade position to provide a
parade mode. The EMIC monitors the request for
this mode through a hard wired day brightness sense
circuit input from the headlamp switch. In this mode,
the EMIC will override the selected panel dimmer
switch signal and send a message over the PCI data
bus to illuminate all vacuum fluorescent displays at
full brightness for easier visibility when driving in
daylight with the exterior lighting turned On. The
parade mode has no effect on the incandescent bulb
illumination intensity.

The hard wired cluster illumination lamps are

diagnosed using conventional diagnostic methods.
Proper testing of the VFD dimming level and the PCI
data bus dimming level message functions requires
the use of a DRBIII

t scan tool. Refer to the appro-

priate diagnostic information.

CHIME WARNING REQUESTS

The EMIC is programmed to request chime service

from the Central Timer Module (CTM) when certain
indicator lamps are illuminated. When the pro-
grammed conditions are met, the EMIC generates an
electronic chime request message and sends it over
the PCI data bus to the CTM. Upon receiving the
proper chime request message, the CTM activates an
integral chime tone generator to provide the audible
chime tone to the vehicle operator. (Refer to 8 -
ELECTRICAL/CHIME/BUZZER

OPERATION).

Proper testing of the EMIC, the CTM and the PCI
data bus chime request message functions requires
the use of a DRBIII

t scan tool. Refer to the appro-

priate diagnostic information.

DIAGNOSIS AND TESTING - INSTRUMENT
CLUSTER

If all of the instrument cluster gauges and/or indi-

cator lamps are inoperative, refer to PRELIMINARY
DIAGNOSIS. If an individual gauge or Programma-
ble Communications Interface (PCI) data bus mes-
sage-controlled indicator lamp is inoperative, refer to
ACTUATOR TEST. If an individual hard wired indi-
cator lamp is inoperative, refer to the diagnosis and
testing information for that specific indicator. If the
instrument cluster illumination lighting is inopera-
tive, refer to CLUSTER ILLUMINATION DIAGNO-
SIS. If the instrument cluster Vacuum-Fluorescent
Display (VFD) dimmer service or chime request func-
tion is inoperative, use a DRBIII

t scan tool to diag-

nose the problem. Refer to the appropriate diagnostic
procedures.

Refer to the appropriate wiring information. The

wiring 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.

NOTE: Certain indicators in this instrument cluster
are programmable or automatically configured. This
feature allows those indicators to be activated or
deactivated for compatibility with certain optional
equipment. If the problem being diagnosed involves
improper illumination of the upshift indicator, use a
DRBIII

scan tool to be certain that the instrument

cluster has been programmed with the proper vehi-
cle equipment option settings. If the problem being
diagnosed involves improper illumination of the
cruise indicator, the door or gate ajar indicators, the
overdrive-off indicator, the service four-wheel drive
indicator, the transmission overtemp indicator, or
the gear selector indicator, disconnect and isolate
the battery negative cable. After about five minutes,
reconnect the battery negative cable and turn the
ignition switch to the On position. The instrument
cluster will automatically relearn the equipment in
the vehicle and properly configure the configurable
indicators accordingly.

8J - 6

INSTRUMENT CLUSTER

INSTRUMENT CLUSTER (Continued)

PRELIMINARY DIAGNOSIS

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) If the indicators operate, but none of the

gauges operate, go to Step 2. If all of the gauges and
the PCI data bus message-controlled indicator lamps
are inoperative, go to Step 5.

(2) Check the fused B(+) fuse (Fuse 1 - 15 ampere)

in the Junction Block (JB). 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

(Fuse 1 - 15 ampere) in the JB. If OK, go to Step 4. If
not OK, repair the open fused B(+) circuit between
the JB and the Power Distribution Center (PDC) 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 panel
wire harness connector (Connector C1) for the instru-
ment cluster. If OK, refer to ACTUATOR TEST. If
not OK, repair the open fused B(+) circuit between
the instrument cluster and the JB as required.

(5) Check the fused ignition switch output (run-

start) fuse (Fuse 8 - 10 ampere) in the JB. 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.

Check for battery voltage at the fused ignition switch
output (run-start) fuse (Fuse 8 - 10 ampere) in the
JB. If OK, go to Step 7. If not OK, repair the open
fused

ignition

switch

output

(run-start)

circuit

between the JB and the ignition switch as required.

(7) Turn the ignition switch to the Off position.

Disconnect and isolate the battery negative cable.
Reinstall the instrument cluster. Reconnect the bat-
tery negative cable. Turn the ignition switch to the
On position. Set the park brake. The brake indicator
in the instrument cluster 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 thumbwheel on the headlamp switch to the
full bright position. The cluster illumination lamps
should light. If OK, go to Step 10. If not OK, repair
the open ground circuit (Z1) between the instrument
panel wire harness connector (Connector C1) for the
instrument cluster and ground (G208) as required.

(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 igni-
tion switch output (run-start) circuit cavity of the
instrument panel wire harness connector (Connector
C1) for the instrument cluster. If OK, refer to
ACTUATOR TEST. If not OK, repair the open fused
ignition switch output (run-start) circuit between the
instrument cluster and the JB as required.

(10) Disconnect and isolate the battery negative

cable. Remove the instrument cluster. Check for con-
tinuity between the ground circuit (Z2) cavity of the
instrument panel wire harness connector (Connector
C1) for the instrument cluster and a good ground.
There should be continuity. If OK, refer to ACTUA-
TOR TEST. If not OK, repair the open ground circuit
to ground (G113) 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 self-
diagnostic test that will confirm that the instrument
cluster circuitry, the gauges, and the PCI data bus
message-controlled indicators are capable of operat-
ing as designed. During the actuator test the instru-
ment cluster circuitry will position each of the gauge
needles at various calibration points, illuminate each
of the segments in the Vacuum-Fluorescent Displays
(VFDs), and turn all of the PCI data bus message-
controlled indicators on and off again.

Successful completion of the actuator test will con-

firm that the instrument cluster is operational. How-

INSTRUMENT CLUSTER

8J - 7

INSTRUMENT CLUSTER (Continued)

ever, there may still be a problem with the PCI data
bus, the Powertrain Control Module (PCM), the
Engine Control Module (ECM), the Central Timer
Module (CTM), the Transmission Control Module
(TCM), the Transfer Case Control Module (TCCM),
the Airbag Control Module (ACM), the Controller
Anti-lock Brake (CAB), or the inputs to one of these
electronic control modules. Use a DRBIII

t scan tool

to diagnose these components. Refer to the appropri-
ate diagnostic information.

(1) Begin the test with the ignition switch in the

Off position.

(2) Depress the odometer/trip odometer switch but-

ton.

(3) While still holding the odometer/trip odometer

switch button depressed, turn the ignition switch to
the On position, but do not start the engine.

(4) Keep the odometer/trip odometer switch button

depressed

for

about

ten

seconds,

until

CHEC

appears in the odometer display, then release the
odometer/trip odometer switch button.

(5) A series of three-digit numeric failure messages

may appear in the odometer display, depending upon
the failure mode. If a failure message appears, refer
to the Instrument Cluster Failure Message chart for
the description and proper correction. If no failure
message appears, the actuator test will proceed as
described in Step 6.

INSTRUMENT CLUSTER FAILURE MESSAGE

Message

Description

Correction

110

A failure has been identified in the instrument
cluster CPU, RAM, or EEPROM.

1. Replace the faulty instrument cluster.

900

The PCI data bus is not operational.

1. Check the PCI data bus connection at the
instrument cluster.

2. Check the instrument cluster fuses.

3. Check the PCI data bus functionality using a
DRBIII

scan tool. Refer to the appropriate

diagnostic information.

920

The instrument cluster is not receiving a
vehicle speed message from the PCM.

1. Check the PCM software level and reflash if
required.

2. Use a DRBIII

scan tool to verify that the

vehicle speed message is being sent by the
PCM.

921

The instrument cluster is not receiving a
distance pulse message from the PCM.

1. Check the PCM software level and reflash if
required.

2. Use a DRBIII

scan tool to verify that the

distance pulse message is being sent by the
PCM.

940

The instrument cluster is not receiving an
airbag lamp-on message from the ACM.

1. Check the PCI data bus connection at the
ACM.

2. Check the ACM fuse.

950

The instrument cluster is not receiving an ABS
lamp-on message from the CAB.

1. Check the PCI data bus connection at the
CAB.

2. Check the CAB fuse.

960

The instrument cluster is not receiving a
PRND21 message from the TCM.

1. Check the PCI data bus connection at the
TCM.

2. Check the TCM fuse.

999

An error has been discovered.

1. Record the failure message.

2. Depress the odometer/trip odometer switch
button to continue the Actuator Test.

8J - 8

INSTRUMENT CLUSTER

INSTRUMENT CLUSTER (Continued)

(6) The instrument cluster will begin the Vacuum

Fluorescent Display (VFD) walking segment test.
This test will require the operator to visually inspect
each VFD segment as it is displayed to determine a
pass or fail condition. First, all of the segments will
be illuminated at once; then, each individual segment
of the VFD will be illuminated in sequence. If any
segment in the display fails to illuminate, repeat the
test to confirm the failure. If the failure is confirmed,
replace the faulty instrument cluster. Following com-
pletion of the VFD walking segment test, the actua-
tor test will proceed as described in Step 7.

(7) The instrument cluster will perform a bulb

check of each indicator that the instrument cluster
circuitry controls. Each of the instrument cluster cir-
cuitry controlled indicators except the cruise indica-
tor and the overdrive-off indicator are illuminated by
a Light Emitting Diode (LED). If an LED fails to illu-
minate during this test, the instrument cluster must
be replaced. Following the bulb check test, the actua-
tor test will proceed as described in Step 8.

(8) The instrument cluster will perform a gauge

actuator test. In this test the instrument cluster cir-
cuitry positions each of the gauge needles at three
different calibration points, then returns the gauge
needles to their relaxed positions. If an individual
gauge does not respond properly, or does not respond
at all during the gauge actuator test, the instrument
cluster should be removed. However, check that the
gauge terminal pins are properly inserted through
the spring-clip terminal pin receptacles on the instru-
ment cluster electronic circuit board before consider-
ing instrument cluster replacement. If the gauge
terminal connections are OK, replace the faulty
instrument cluster.

(9) 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 on the PCI data bus during
the test.

(10) Go back to Step 1 to repeat the test, if

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 - DIAGNOSIS AND TEST-
ING). If no exterior lighting system problems are
found, the following procedure will help locate a
short or open in the cluster illumination lamp circuit.
If the problem being diagnosed involves a lack of
dimming control for the odometer/trip odometer or
gear selector indicator Vacuum Fluorescent Displays
(VFDs), but all of the other cluster illumination
lamps can be dimmed, test and repair the day bright-
ness circuit between the instrument cluster and the
headlamp switch as required. Refer to the appropri-
ate

wiring

information.

The

wiring

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 connec-
tors, splices and grounds.

(1) Check the instrument panel dimmer fuse (Fuse

9 - 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 instru-
ment panel dimmer fuse (Fuse 9 - 5 ampere) in the
JB. Rotate the panel lamps dimmer thumbwheel
downward 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 (Fuse 9 - 5 ampere) from the JB. Probe the
fused panel lamps dimmer switch signal circuit cav-
ity of the instrument panel wire harness connector

INSTRUMENT CLUSTER

8J - 9

INSTRUMENT CLUSTER (Continued)

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