exj 8v, JEEP Manuals, Electronic Service Manual (jeep cherokee xj do 2000)
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XJ
OVERHEAD CONSOLE SYSTEMS
8V - 1
OVERHEAD CONSOLE SYSTEMS
TABLE OF CONTENTS
page
page
GENERAL INFORMATION
DESCRIPTION AND OPERATION
DIAGNOSIS AND TESTING
TRIP COMPUTER, COMPASS, AND
SERVICE PROCEDURES
REMOVAL AND INSTALLATION
TRIP COMPUTER, COMPASS, AND
GARAGE DOOR OPENER STORAGE BIN
SPECIAL TOOLS
GENERAL INFORMATION
door opener storage bin, and a sunglasses storage
bin.
On models equipped with the Remote Keyless
Entry (RKE) option, the RKE receiver is also located
within the overhead console housing. Refer to Group
8P - Power Lock Systems for more information on
this feature.
Following are general descriptions of the major
components used in the overhead console. Refer to
the owner’s manual in the vehicle glove box for more
information on the features, use and operation of the
various overhead console components.
INTRODUCTION
An overhead console featuring a mini trip com-
puter, an electronic compass, and an outside ambient
temperature thermometer is an available factory-in-
stalled option on this model. Refer to 8W-49 - Over-
head Console in Group 8W - Wiring Diagrams for
complete circuit descriptions and diagrams.
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.
DESCRIPTION AND OPERATION
TRIP COMPUTER
A mini trip computer is available on this model to
provide several electronic functions and features. The
trip computer contains a central processing unit and
interfaces with other modules in the vehicle on the
Chrysler Collision Detection (CCD) data bus network.
The CCD data bus network allows the sharing of
sensor information. This helps to reduce wire har-
ness complexity, reduce internal controller hardware,
and reduce component sensor current loads. At the
same time, this system provides increased reliability,
enhanced
OVERHEAD CONSOLE
The overhead console for this model includes a
mini trip computer, an electronic compass, and an
outside ambient temperature thermometer. The over-
head console also houses two front-mounted and two
rear-mounted reading and courtesy lamps, a garage
diagnostics,
and
allows
the
addition
of
many new feature capabilities.
8V - 2
OVERHEAD CONSOLE SYSTEMS
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DESCRIPTION AND OPERATION (Continued)
Some of the functions and features that the trip
computer supports and/or controls, include the fol-
lowing display options:
²
cession flag can exceed the compensating ability of
the compass unit if placed on the roof panel. Mag-
netic bit drivers used on the fasteners that hold the
assembly to the roof header can also affect compass
operation. If the vehicle roof should become magne-
tized, demagnetizing and calibration may be required
to restore proper compass operation. See Compass
Calibration or Compass Demagnetizing in the Service
Procedures section of this group for these procedures.
The compass, trip computer, and thermometer dis-
play module cannot be repaired, and is only available
for service as a unit. If faulty or damaged, the com-
plete module must be replaced. The push button
(Step and U. S./Metric) switch module is serviced
separately.
Compass and temperature
²
Trip odometer (ODO)
²
Average fuel economy (AVG ECO)
²
Instant fuel economy (ECO)
²
Distance to empty (DTE)
²
Elapsed time (ET)
Blank display.
Momentarily depressing and releasing the Step
button when the ignition switch is in the On position
will cause the overhead console display to step
sequentially through the listed display options.
Momentarily depressing and releasing the U. S./Met-
ric button toggles the display between U. S. and Met-
ric measurements.
The push button (Step and U. S./Metric) switch
module in the overhead console is hard wired to the
trip computer. The compass flux-gate unit is integral
to the trip computer, compass, and thermometer dis-
play module unit. Data input for all other trip com-
puter functions is received through CCD data bus
messages. The trip computer uses its internal pro-
gramming and all of these inputs to calculate and
display the requested data. If the data displayed is
incorrect, see Trip Computer, Compass, and Ther-
mometer Display Module - Self-Diagnostic Test in the
Diagnosis and Testing section of this group. If these
tests prove inconclusive, the use of a DRB scan tool
and the proper Diagnostic Procedures manual are
recommended for further testing of the trip computer
and the CCD data bus.
The trip computer, compass, and thermometer dis-
play module cannot be repaired, and is only available
for service as a unit. If faulty or damaged, the com-
plete module must be replaced. The push button
(Step and U. S./Metric) switch module is serviced
separately.
²
THERMOMETER
The thermometer displays the outside ambient
temperature. The temperature display can be
changed from Fahrenheit to Celsius using the U.
S./Metric button, located just rearward of the display
module. The displayed temperature is not an instant
reading of conditions, but an average temperature. It
may take the thermometer display several minutes
to respond to a major temperature change, such as
driving out of a heated garage into winter tempera-
tures.
When the ignition switch is turned to the Off posi-
tion, the last displayed temperature reading stays in
the thermometer unit memory. When the ignition
switch is turned to the On position again, the ther-
mometer will display the memory temperature if the
engine coolant temperature is above about 52° C
(125° F). If the engine coolant temperature is below
about 52° C (125° F), the thermometer will display
the actual temperature sensed by the ambient tem-
perature sensor. The thermometer temperature dis-
play update interval varies with the vehicle speed.
The thermometer function is supported by an
ambient temperature sensor. The sensor is mounted
outside the passenger compartment near the front
and center of the vehicle and is hard-wired to the
module. The ambient temperature sensor is available
as a separate service item.
The thermometer, compass, and trip computer dis-
play module cannot be repaired, and are only avail-
able for service as a unit. If faulty or damaged, the
complete module must be replaced. The push button
(Step and U. S./Metric) switch module and ambient
temperature sensor are serviced separately.
COMPASS
The compass will display the direction in which the
vehicle is pointed using the eight major compass
headings (Examples: north is N, northeast is NE). It
does not display the headings in actual degrees.
The self-calibrating compass unit requires no
adjusting in normal use. The only calibration that
may prove necessary is to drive the vehicle in three
complete circles, on level ground, in not less than 48
seconds. This will reorient the compass unit to its
vehicle.
The compass unit also will compensate for magne-
tism the body of the vehicle may acquire during nor-
mal use. However, avoid placing anything magnetic
directly on the roof of the vehicle. Magnetic mounts
for an antenna, a repair order hat, or a funeral pro-
READING AND COURTESY LAMP
All reading and courtesy lamps located in the over-
head console are activated by the door ajar switches.
When the doors are closed, the lamps can be individ-
ually activated by depressing the corresponding lens.
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OVERHEAD CONSOLE SYSTEMS
8V - 3
DESCRIPTION AND OPERATION (Continued)
When a door is open, depressing the lamp lens
switches will not turn the lamps off. Refer to Group
8L - Lamps, for diagnosis of the reading and courtesy
lamps.
The reading and courtesy lamp lens, and bulbs are
available for service replacement. The reading and
courtesy lamp holders and switches are only avail-
able as part of the overhead console wire harness. If
any reading lamp switch is faulty or damaged, the
wire harness and all four switches must be replaced.
message inputs being received from the instrument
cluster over the Chrysler Collision Detection (CCD)
data bus. If the problem is a no-display condition,
use the following procedures. For circuit descriptions
and diagrams, refer to 8W-49 - Overhead Console in
Group 8W - Wiring Diagrams.
(1) Check the fuses in the junction block and 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(s).
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output fuse in the junction block. If OK, go to Step 3.
If not OK, repair the open 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 overhead console from the headliner.
Check for continuity between the ground circuit cav-
ities of the overhead console wire harness connector
and a good ground. There should be continuity. If
OK, go to Step 4. If not OK, repair the open circuit to
ground as required.
(4) Connect the battery negative cable. Check for
battery voltage at the fused B(+) circuit cavity of the
overhead console wire harness connector. If OK, go to
Step 5. If not OK, repair the open circuit to the junc-
tion block as required.
(5) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output circuit cavity of the overhead console wire
harness connector. If OK, proceed to the Self-Diag-
nostic Test in this group for further diagnosis of the
module and the CCD data bus. If not OK, repair the
open circuit to the junction block as required.
GARAGE DOOR OPENER STORAGE BIN
A compartment in the overhead console is designed
to hold most garage door opener remote control
transmitters. The transmitter is mounted within the
compartment with an adhesive-backed hook and loop
fastener patch.
With the transmitter mounted in the storage bin,
adapter pegs located on the front of the storage bin
door are selected and mounted on a post near the
center of the storage bin door. The peg(s) selected
and/or the post must be long enough to depress the
button of the transmitter, when the garage door
opener storage bin door is depressed. The pegs may
be stacked, if necessary. Refer to the owner’s manual
in the vehicle glove box for more information.
A transmitter mounting kit including the adhesive-
backed hook and loop fastener material and a selec-
tion of pegs is available for service. The garage door
opener storage bin door assembly is also available for
service replacement.
SUNGLASSES STORAGE BIN
A sunglasses storage bin is included in the over-
head console. The interior of the bin is lined with a
foam rubber padding material to protect the sun-
glasses from being scratched. This bin features a
push/push-type latching mechanism, and a viscous
dampening system for a fluid opening action.
The sunglasses storage bin door, latch, viscous
damper, hinge spring and housing are available for
service only as a complete module. If any part of this
unit is faulty or damaged, the entire module must be
replaced.
SELF-DIAGNOSTIC TEST
A self-diagnostic test is used to determine that the
trip computer, compass, thermometer, and all of the
display module segments are operating properly elec-
trically. Initiate the self-diagnostic test as follows:
(1) With the ignition switch in the Off position,
simultaneously press and hold the Step button and
the U. S./Metric button.
(2) Turn the ignition switch to the On position.
(3) Continue to hold both buttons until the display
module performs a display segment test. In this test,
all of the vacuum fluorescent display segments are
lighted. This test will:
a. Verify that all display segments are functional
b. Check the internal circuitry of the module
c. Check that all of the CCD data bus messages
needed are being received.
(4) Respond to the respective test results as fol-
lows. If all tests are passed, the module will automat-
ically return to normal operation.
DIAGNOSIS AND TESTING
TRIP COMPUTER, COMPASS, AND
THERMOMETER DISPLAY MODULE
If the problem with the trip computer, compass,
and thermometer display module is an inaccurate or
scrambled display, use the Self-Diagnostic Test proce-
dures. If the problem is incorrect display lighting lev-
els, use a DRB scan tool and the proper Diagnostic
Procedures manual to test for the correct dimming
8V - 4
OVERHEAD CONSOLE SYSTEMS
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DIAGNOSIS AND TESTING (Continued)
a. In the display segment test, if any segment
should fail to light the unit is faulty and must be
replaced.
b. If the internal circuitry test is failed, the mod-
ule will display “FAIL”. If “FAIL” is displayed, the
unit is faulty and must be replaced.
c. If the CCD data bus message test is failed, the
module will display “CCD”. If “CCD” is displayed, the
use of a DRB scan tool and the proper Diagnostic
Procedures manual are required for further diagno-
sis.
(5) Momentarily depress and release either button
one time to exit the self-diagnostic test mode and
return the trip computer, compass, and thermometer
display module to normal operation.
SENSOR TEST
(1) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the temperature sensor wire harness connec-
tor.
(2) Measure the resistance of the temperature sen-
sor. At -40° C (-40° F), the sensor resistance is 336
kilohms. At 55° C (131° F), the sensor resistance is
2.986 kilohms. The sensor resistance should read
between these two values. If OK, go to the Sensor
Circuit Test. If not OK, replace the faulty sensor.
SENSOR CIRCUIT TEST
(1) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the ambient temperature sensor wire har-
ness connector and the overhead console wire har-
ness connector.
(2) Connect a jumper wire between the two termi-
nals in the body half of the sensor wire harness con-
nector.
(3) Check for continuity between the sensor return
circuit and the ambient temperature sensor signal
circuit cavities of the overhead console wire harness
connector. There should be continuity. If OK, go to
Step 4. If not OK, repair the open circuit as required.
(4) Remove the jumper wire from the ambient tem-
perature sensor wire harness connector. Check for
continuity between the sensor return circuit cavity of
the overhead console wire harness connector and a
good ground. There should be no continuity. If OK, go
to Step 5. If not OK, repair the short circuit as
required.
(5) Check for continuity between the ambient tem-
perature sensor signal circuit cavity of the overhead
console wire harness connector and a good ground.
There should be no continuity. If OK, see the Trip
Computer, Compass, and Thermometer Display Mod-
ule diagnosis in this group. If not OK, repair the
short circuit as required.
NOTE: If the compass functions, but accuracy is
suspect, it may be necessary to perform a variation
adjustment. This procedure allows the compass
unit to accommodate variations in the earth’s mag-
netic field strength, based on geographic location.
See the Compass Variation Adjustment procedures,
in this group.
NOTE: If the compass reading has blanked out, and
only “CAL” appears in the display module, demag-
netizing may be necessary to remove excessive
residual magnetic fields from the vehicle. See the
Compass Demagnetizing procedure, in this group.
THERMOMETER
The thermometer function is supported by a ambi-
ent temperature sensor, a wiring circuit, and a por-
tion of the overhead console trip computer, compass,
and thermometer display module display. The sensor
is mounted outside the passenger compartment near
the front and center of the vehicle.
If any portion of the ambient temperature sensor
circuit fails, the thermometer display will self-diag-
nose the circuit. An “SC” (short circuit) will appear in
the display in place of the temperature, when the
sensor is exposed to temperatures above 55° C (131°
F), or if the sensor circuit is shorted. An “OC” (open
circuit) will appear in the display in place of the tem-
perature, when the sensor is exposed to temperatures
below -40° C (-40° F), or if the sensor circuit is open.
The ambient temperature sensor circuit can also be
diagnosed using the following Sensor Test, and Sen-
sor Circuit Test. If the temperature sensor and cir-
cuit are confirmed to be OK, but the temperature
display is inoperative or incorrect, see the Trip Com-
puter, Compass, and Thermometer Display Module
diagnosis in this group. For circuit descriptions and
diagrams,
SERVICE PROCEDURES
COMPASS VARIATION ADJUSTMENT
Variance is the difference between magnetic north
and geographic north. In some geographic locations,
the difference between magnetic and geographic
north is great enough to cause the compass to give
false readings. If this problem occurs, the compass
variance must be set.
To set the compass variance:
(1) Using the Variance Settings map, find your
geographic location and note the zone number (Fig.
1).
refer
to
8W-49
-
Overhead
Console
in
Group 8W - Wiring Diagrams.
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OVERHEAD CONSOLE SYSTEMS
8V - 5
SERVICE PROCEDURES (Continued)
Fig. 1 Variance Settings
(2) Turn the ignition switch to the On position. If
the compass/temperature data is not currently being
displayed, momentarily depress and release the Step
button to step through the display options until you
have reached the compass/temperature display.
(3) Depress both the U. S./Metric, and the Step
buttons. Hold the buttons down until “VAR” appears
in the display. This takes about five seconds.
(4) Release both of the buttons. The current vari-
ance zone number setting will appear in the display.
(5) Press and release the U. S./Metric button to
step through the zone numbers, until the zone num-
ber for your geographic location appears in the dis-
play.
(6) Press the Step button to enter this zone num-
ber into the compass unit memory.
(7) Confirm
This allows the compass unit to compensate for small
changes in the residual magnetism that the vehicle
may acquire during normal use. Do not attempt to
calibrate the compass near large metal objects such
as other vehicles, large buildings, or bridges.
NOTE: Whenever the compass is calibrated manu-
ally, the variation number must also be reset. See
Compass Variation Adjustment in the Service Pro-
cedures section of this group.
Calibrate the compass manually as follows:
(1) Start the engine. If the compass/temperature
data is not currently being displayed, momentarily
depress and release the Step button to step through
the display options until you have reached the com-
pass/temperature display.
(2) Depress both the U. S./Metric and the Step
buttons. Hold the buttons down until “CAL” appears
in the display. This takes about ten seconds, and
appears about five seconds after “VAR” is displayed.
(3) Release both of the buttons.
(4) Drive the vehicle on a level surface, away from
large metal objects, through three or more complete
circles in not less than 48 seconds. The “CAL” mes-
sage will disappear from the display to indicate that
the compass is now calibrated.
that
the
correct
directions
are
now
indicated by the compass.
COMPASS CALIBRATION
CAUTION: Do not place any external magnets, such
as magnetic roof mount antennas, in the vicinity of
the compass. Do not use magnetic tools when ser-
vicing the overhead console.
The electronic compass unit features a self-cali-
brating design, which simplifies the calibration pro-
cedure. This feature automatically updates the
compass calibration while the vehicle is being driven.
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