Jeep Wrangler TJ. Manual — part 300
driver/passenger door ajar warning, the head/park
lights-on reminder, and the key-in ignition reminder.
For the remaining chime warning functions, the
EMIC uses a combination of hard wired inputs, elec-
tronic message inputs received from other modules
over the PCI data bus, and internal programming.
(Refer
to
8
-
ELECTRICAL/CHIME/BUZZER
-
OPERATION).
The hard wired chime inputs to the EMIC may be
diagnosed using conventional diagnostic methods.
However, proper testing of the EMIC programming
and the electronic chime request messages received
by the EMIC over the PCI data bus requires the use
of a DRBIII
t scan tool. Refer to the appropriate diag-
nostic information.
ELECTRONIC PINION FACTOR
Each time the EMIC receives an electronic pinion
factor request message from the Powertrain Control
Module (PCM) over the PCI data bus, it provides a
response to the PCM containing the appropriate elec-
tronic pinion factor information. Because there are
numerous optional combinations of tire size, axle
ratio, and transfer case type which are available for
this vehicle, the electronic pinion factor needs to be
considered for accurate processing of the vehicle
speed and distance information. The instrument clus-
ter stores the electronic pinion factor information and
broadcasts it over the PCI data bus upon request by
the PCM. Using this factor and the Vehicle Speed
Sensor (VSS) input, the PCM then calculates the
proper vehicle speed and distance information, and
transmits the appropriate electronic vehicle speed
messages over the PCI data bus for use by other elec-
tronic modules in the vehicle.
Proper testing of the PCI data bus and the elec-
tronic data bus message inputs to and outputs from
the EMIC that control the electronic pinion factor
function requires the use of a DRBIII
t scan tool.
Refer to the appropriate diagnostic information.
INTERIOR LIGHTING CONTROL
The EMIC contains an integral timer and logic cir-
cuit to perform both timer and control functions for
the interior courtesy lamps. The EMIC uses hard
wired inputs from the ignition switch, both door ajar
switches on separate driver and passenger door ajar
switch sense circuits, from the resistor multiplexed
panel lamps dimmer circuitry of the left multi-func-
tion switch on the panel lamps dimmer signal circuit
and its control logic to provide a battery current out-
put to the courtesy lamps on a courtesy lamp feed
circuit. The EMIC control provides a theater-type
fade-to-off feature that will slowly dim the courtesy
lamps about five seconds after both doors are closed.
The EMIC interior lighting control programming
provides an illuminated entry/exit feature by moni-
toring the door ajar and ignition switch inputs. When
a door is opened with the ignition switch in the Off
position, the EMIC turns on the courtesy lamps.
When the ignition switch is turned to the On or Start
positions, the EMIC turns the courtesy lamps off
immediately with no theater dimming. When the
ignition switch is turned from the On position to the
Off position, the EMIC turns on the interior lights
for about ten seconds or until the ignition switch is
again turned to the On or Start positions, whichever
occurs first.
The EMIC interior lighting control programming
also provides a battery saver feature (load shedding)
for the interior lighting. Unless the engine is run-
ning, the EMIC will automatically turn off the inte-
rior lights if they are left on for more than about
twenty minutes, regardless of the status of the igni-
tion switch, door ajar switch, or left multi-function
switch inputs to the cluster.
The hard wired inputs and output of the EMIC
interior lighting control may be diagnosed using con-
ventional diagnostic methods; however, there are no
other diagnostic tools available for the EMIC timer
and logic circuitry. If the input and output compo-
nents and circuits of the interior lighting system test
OK, but the system fails to operate as designed, the
EMIC must be replaced.
REAR WINDOW DEFOGGER CONTROL
The EMIC contains an integral timer and logic cir-
cuit to perform the rear window defogger timer and
control functions for the optional rear window defog-
ger system. The EMIC uses a hard wired input from
the rear window defogger switch on the rear window
defogger switch sense circuit and its control logic to
determine the correct output to the rear window
defogger relay. The EMIC controls the ground path of
the rear window defogger relay control coil through
an output on the rear window defogger relay control
circuit.
The
EMIC
is
programmed
to
interpret
each
momentary ground signal it receives on the rear win-
dow defogger switch sense circuit as a request to
change the current state of the output on the rear
window defogger relay control circuit. Therefore, with
the ignition switch in the On position, the first
ground input on the rear window defogger switch
sense circuit turns the system On, the second ground
input turns the system Off, and so forth. Once the
rear window defogger system has been turned On, it
can be turned off manually by depressing the rear
window defogger switch a second time or by turning
the ignition switch to the Off position.
TJ
INSTRUMENT CLUSTER
8J - 9
INSTRUMENT CLUSTER (Continued)
The timer function of the EMIC will also automat-
ically turn the rear window defogger system Off. The
timer turns the system Off after about ten minutes of
operation; however, after the first timed interval has
expired, each time the system is turned On again
during that same ignition cycle, the timer will auto-
matically turn it Off after about five minutes of oper-
ation.
The hard wired input and output of the EMIC rear
window defogger control may be diagnosed using con-
ventional diagnostic methods; however, there are no
other diagnostic tools available for the EMIC rear
window defogger timer and logic circuitry. If the
input and output components and circuits of the rear
window defogger system test OK, but the system
fails to operate as designed, the EMIC must be
replaced.
INPUT AND OUTPUT CIRCUITS
HARD WIRED INPUTS
The hard wired inputs to the EMIC include the fol-
lowing:
• ABS Warning Indicator Driver
• Brake Warning Indicator Sense
• Driver Door Ajar Switch Sense
• Fog Lamp Feed
• Front Axle Lock Request (w/Off-Road Pack-
age Only)
• Front Lock Indicator Switch Sense (w/Off-
Road Package Only)
• Fused B(+) - Ignition-Off Draw
• Fused Ignition Switch Output (Run-Start)
• Headlamp Switch Output
• High Beam Indicator Driver
• Key-In Ignition Switch Sense
• Left Turn Signal
• Panel Lamps Dimmer Signal
• Passenger Door Ajar Switch Sense
• Rear Axle Lock Request (w/Off-Road Pack-
age Only)
• Rear Lock Indicator Switch Sense (w/Off-
Road Package Only)
• Rear Window Defogger Switch Sense
• Right Turn Signal
• Seat Belt Switch Sense
• 4WD Switch Sense (w/o Off-Road Package
only)
Refer to the appropriate wiring information for
additional details.
HARD WIRED OUTPUTS
The hard wired outputs of the EMIC include the
following:
• Courtesy Lamp Feed
• Axle Lock Switch Enable 1 (w/Off-Road
Package Only)
• Axle Lock Switch Enable 2 (w/Off-Road
Package Only)
• Panel Lamp Feed
• Rear Window Defogger Relay Control
Refer to the appropriate wiring information for
additional details.
GROUNDS
The EMIC receives a ground path through the fol-
lowing hard wired circuit:
• Ground - G201
Refer to the appropriate wiring information for
additional details.
COMMUNICATION
The EMIC has the following data bus communica-
tion circuit:
• PCI Data Bus
Refer to the appropriate wiring information for
additional details.
DIAGNOSIS AND TESTING - INSTRUMENT
CLUSTER
If all of the instrument cluster gauges and/or indi-
cators
are
inoperative,
refer
to
PRELIMINARY
DIAGNOSIS. If an individual gauge or Programma-
ble Communications Interface (PCI) data bus mes-
sage-controlled indicator is inoperative, refer to
ACTUATOR TEST. If an individual hard wired indi-
cator is inoperative, refer to the diagnosis and testing
information for that specific indicator. If the instru-
ment cluster interior lighting control function is inop-
erative, refer to INTERIOR LIGHTING CONTROL
DIAGNOSIS. If the axle locker control is inoperative,
refer to AXLE LOCKER CONTROL DIAGNOSIS. If
the instrument cluster rear window defogger control
function is inoperative, refer to REAR WINDOW
DEFOGGER CONTROL DIAGNOSIS.
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.
8J - 10
INSTRUMENT CLUSTER
TJ
INSTRUMENT CLUSTER (Continued)
CAUTION: Instrument clusters used in this model
automatically configure themselves for compatibil-
ity with the features and optional equipment in the
vehicle in which they are initially installed. The
instrument cluster is programmed to do this by
embedding the Vehicle Identification Number (VIN)
and other information critical to proper cluster
operation into electronic memory. This embedded
information is learned through electronic messages
received from other electronic modules in the vehi-
cle over the Programmable Communications Inter-
face (PCI) data bus, and through certain hard wired
inputs received when the cluster is connected to
the vehicle electrically. Once configured, the instru-
ment cluster memory may be irreparably damaged
and certain irreversible configuration errors may
occur if the cluster is connected electrically to
another vehicle; or, if an electronic module from
another vehicle is connected that provides data to
the instrument cluster (including odometer values)
that
conflicts
with
that
which
was
previously
learned and stored. Therefore, the practice of
exchanging (swapping) instrument clusters and
other electronic modules in this vehicle with those
removed from another vehicle must always be
avoided. Failure to observe this caution may result
in instrument cluster damage, which is not reim-
bursable under the terms of the product warranty.
Service replacement instrument clusters are pro-
vided with the correct VIN, and the certified odom-
eter value embedded into cluster memory, but will
otherwise be automatically configured for compati-
bility with the features and optional equipment in
the vehicle in which they are initially installed.
NOTE: Certain indicators in this instrument cluster
are automatically configured. This feature allows
those indicators to be activated for deactivated for
compatibility with certain optional equipment. If the
problem being diagnosed involves improper illumi-
nation of the airbag indicator, the cruise indicator,
or the SKIM indicator when the vehicle does not
have this equipment, the instrument cluster must
be replaced with a new unit.
PRELIMINARY DIAGNOSIS
WARNING:
TO
AVOID
PERSONAL
INJURY
OR
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) Check the fused B(+) fuse (Fuse 24 - 10
ampere) in the Power Distribution Center (PDC). 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 24 - 10 ampere) in the PDC. If OK, go to Step
3. If not OK, repair the open B(+) circuit between the
PDC and the battery as required.
(3) Disconnect and isolate the battery negative
cable. Remove the instrument cluster. Reconnect 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 PDC as required.
(4) Check the fused ignition switch output (run-
start) fuse (Fuse 10 - 10 ampere) in the fuse block. If
OK, go to Step 5. If not OK, repair the shorted circuit
or component as required and replace the faulty fuse.
(5) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run-start) fuse (Fuse 10 - 10 ampere) in the
fuse block. If OK, go to Step 6. If not OK, repair the
open fused ignition switch output (run-start) circuit
between the fuse block and the ignition switch as
required.
(6) 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
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 out-
put (run-start) circuit between the instrument cluster
and the fuse block as required.
(7) Check for continuity between the ground cir-
cuit cavity of the instrument panel wire harness con-
nector (Connector C1) for the instrument cluster and
a good ground. There should be continuity. If OK,
refer to ACTUATOR TEST. If not OK, repair the
open ground circuit to ground (G201) as required.
TJ
INSTRUMENT CLUSTER
8J - 11
INSTRUMENT CLUSTER (Continued)
ACTUATOR TEST
WARNING:
TO
AVOID
PERSONAL
INJURY
OR
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.
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, the PCI data bus mes-
sage controlled indicators, and the chime tone gener-
ator are capable of operating as designed. During the
actuator test the instrument cluster circuitry will
sound the chime tone generator, position each of the
gauge needles at various calibration points, illumi-
nate all of the segments in the Vacuum-Fluorescent
Display (VFD) unit, turn all of the PCI data bus mes-
sage-controlled indicators on and off again, and dis-
play messages in the VFD for certain faults that
have been set. It is suggested that a note pad and
pencil be used to write down any fault information
that is displayed during the test for reference.
Successful completion of the actuator test will con-
firm that the instrument cluster is operational. How-
ever, there may still be a problem with the PCI data
bus, the Powertrain Control Module (PCM), the Air-
bag Control Module (ACM), the Sentry Key Immobi-
lizer Module (SKIM), 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.
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 four screws securing the inoperative
gauge to the instrument cluster electronic circuit
board are properly tightened before considering
instrument cluster replacement. If the gauge mount-
ing screws check OK, replace the faulty instrument
cluster.
(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) Release the odometer/trip odometer switch but-
ton.
(5) The
instrument
cluster
will
automatically
begin the actuator test sequence, as follows:
(a) The cluster will generate a single chime tone
to confirm the functionality of the chime tone gen-
erator and the chime control circuitry.
(b) The cluster will scroll the number “8” across
the odometer/trip odometer VFD to confirm the
functionality of all VFD segments and their control
circuitry.
(c) The cluster will illuminate the decimal point
in the odometer/trip odometer VFD to confirm the
functionality of this VFD segment and its control
circuitry.
(d) The cluster will display the EMIC software
level in the odometer/trip odometer VFD (example:
“SOF 8.9”).
(e) The cluster will display the last six digits
(sequence number) of the Vehicle Identification
Number (VIN) in the odometer/trip odometer VFD.
(f) If any faults have been set by the cluster, the
cluster will display the fault information in the
odometer/trip
odometer
VFD
INSTRUMENT
CLUSTER FAILURE MESSAGE. If no faults have
been set, the cluster will scroll “no FAULtS” across
the odometer/trip odometer VFD.
(g) The cluster will turn on, then off again each
of the following indicators, one at a time, in
sequence to confirm the functionality of the indica-
tor and the cluster control circuitry:
− High Beam
− Brake
− Seatbelt
− MIL
− Check Gauges
− Low Fuel
− 4WD
− SKIS
− Cruise
(h) The cluster will sweep the needles for each of
the following gauges, one at a time, to several cal-
ibration points in sequence to confirm the function-
ality of the gauge and the cluster control circuitry:
− Speedometer
− Fuel
− Temperature
− Tachometer
− Voltage
− Oil Pressure
8J - 12
INSTRUMENT CLUSTER
TJ
INSTRUMENT CLUSTER (Continued)
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