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8E - 4
INSTRUMENT PANEL SYSTEMS
DESCRIPTION AND OPERATION (Continued)
ACCESSORY RELAY
DESCRIPTION
The accessory relay is an electromechanical device
that switches fused battery current to the standard
accessory power outlet or optional cigar lighter when
the ignition switch is turned to the Accessory or On
positions. The accessory relay is located in a wire
harness connector that is secured to the 100-way con-
nector bracket under the driver side of the instru-
ment panel, near the cowl side inner panel in the
passenger compartment.
The accessory 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 accessory 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 mov-
able) electrical contacts. The movable (common feed)
relay contact is held against one of the fixed contacts
(normally closed) by spring pressure. When the elec-
tromagnetic 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 con-
nected in parallel with the electromagnetic coil in the
relay, and helps to dissipate voltage spikes that are
produced when the coil is de-energized.
DIAGNOSIS AND TESTING
INSTRUMENT CLUSTER
If all of the gauges and/or indicator lamps are inop-
erative, 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 Dia-
grams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS,
REFER
TO
GROUP
8M
-
PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING
WHEEL,
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG 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 CCD data bus message-controlled indicator lamps
are inoperative, go to Step 5.
(2) Check the fused B(+) fuse in the Power Distri-
bution 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 fuseblock module. 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 fuseblock module. If
OK, go to Step 7. If not OK, repair the open fused
ignition switch output (run/start) circuit to the igni-
tion 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
STEERING
COLUMN,
TJ
OR
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