8e electrical CHRYSLER VOYAGER 2004 Service Manual

CONDITION POSSIBLE CAUSES CORRECTION
FOG LAMPS FLASH
RANDOMLY1. Poor lighting circuit Z349/Z248
ground.1. Test for voltage drop across Z349/Z248
ground locations. Refer to Electrical, Wiring
Information.
2. Variable resistance in fog lamp
circuit.2. Test amperage draw of fog lamp circuit.
3. Faulty fog lamp switch (part of
headlamp switch).3. Replace headlamp switch.
4. Loose or corroded terminals or
splices in circuit.4. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
5. Is relay engaging properly? 5. Verify function of fog lamp relay in IPM.
6. PCI Bus Communication. 6. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
FOG LAMPS DO NOT
ILLUMINATE1. Blown fuse for fog lamp. 1. Replace fuse. Refer to Electrical, Wiring
Information.
2. No Z349/Z248 ground at fog
lamps.2. Repair circuit ground. Refer to Electrical,
Wiring Information.
3. Faulty fog lamp switch (part of
headlamp switch).3. Replace headlamp switch.
4. Broken connector terminal or
wire splice in fog lamp circuit.4. Repair connector terminal or wire splice.
5. Faulty or burned out bulb. 5. Replace bulb.
6. Is relay engaging? 6. Verify function of fog lamp relay in IPM.
7. PCI Bus Communication. 7. Verify PCI bus message (fog lamp info)
transmitted from BCM and received by FCM.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) From behind the bumper fascia, twist bulb
counter-clockwise, and remove bulb. (Fig. 8).
(3) Remove the wire connector from the fog lamp
bulb.
INSTALLATION
(1) Reconnect wire harness to bulb.
(2) Install bulb and twist clockwise.
(3) Install battery negative cable.
Fig. 8 FRONT FOG LAMP
1 - FRONT FOG LAMP MOUNTING NUT
2 - FRONT FOG LAMP
8L - 8 LAMPS/LIGHTING - EXTERIORRS
FRONT FOG LAMP (Continued)

HEADLAMP DIAGNOSIS
CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS ARE DIM
WITH ENGINE IDLING
OR IGNITION TURNED
OFF.1. Loose or corroded battery
cables.1. Clean and secure battery cable clamps and
posts.
2. Loose or worn generator drive
belt.2. Adjust or replace generator drive belt.
3. Charging system output too low. 3. Test and repair charging system, refer to
Electrical, Charging
4. Battery has insufficient charge. 4. Test battery state-of-charge, refer to
Electrical, Battery System.
5. Battery is sulfated or shorted. 5. Load test battery, refer to Electrical, Battery
System.
6. Poor lighting circuit Z343/Z344-
ground.6. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Diagram Information.
HEADLAMP BULBS
BURN OUT
FREQUENTLY.1. Integrated Power Module (IPM)
not controlling voltage.1. Test and repair Integrated Power Module.
2. Loose or corroded terminals or
splices in circuit.2. Inspect and repair all connectors and splices.
Refer to Electrical, Wiring Information.
HEADLAMPS ARE DIM
WITH ENGINE
RUNNING ABOVE IDLE.1. Charging system output too low. 1. Test and repair charging system, refer to
Electrical, Wiring Information.
2. Poor lighting circuit Z343/Z344-
ground.2. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Information.
3. High resistance in headlamp
circuit.3. Test amperage draw of headlamp circuit.
HEADLAMPS FLASH
RANDOMLY1. Poor lighting circuit Z343/Z344-
ground.1. Test for voltage drop across Z343/Z344-
ground locations, refer to Electrical, Wiring
Information.
2. Variable resistance in headlamp
circuit.2. Test amperage draw of headlamp circuit.
3. Loose or corroded terminals or
splices in circuit.3. Inspect and repair all connectors and splices,
refer to Electrical, Wiring Information.
4. Faulty headlamp switch. 4. Replace headlamp switch.
RSLAMPS/LIGHTING - EXTERIOR8L-11
HEADLAMP (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
HEADLAMPS DO NOT
ILLUMINATE.1. No voltage to headlamps. 1. Repair open headlamp circuit, refer to
Electrical, Wiring Information.
2. No Z343/Z344-ground at
headlamps.2. Repair circuit ground, refer to Electrical,
Wiring Information.
3. Broken connector terminal or
wire splice in headlamp circuit.3. Repair connector terminal or wire splice.
4. Faulty or burned out bulb. 4. Replace headlamp bulb(s).
5. Body Control Module
malfunction.5. Refer to appropriate Body Control Module
diagnostics.
6. PCI Bus Communication 6. Verify messages being transmitted by BCM
and received by FCM.
7. IPM/FCM Malfunction. 7. Refer to appropriate IPM/FCM diagnostics.
HEADLAMPS ON WITH
IGNITION IN RUN, WITH
HEADLAMP SWITCH
OFF.1. Faulty headlamp switch. 1. Replace headlamp switch (review BCM
logged faults).
2. Diagnostic tool indicates (4.7 -
5.0V) on headlamp switch input to
BCM.2. Inspect and repair terminals, connectors and
open circuits.
3. PCI Bus Communication. 3. Verify messages being transmitted by BCM
and received by FCM.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove headlamp unit retaining screws.
(3) Remove headlamp unit to expose back of unit.
(4) Remove wiring connector from bulb.
(5) Rotate headlamp bulb retaining ring counter-
clockwise.(6) Pull headlamp bulb and remove from headlamp
unit (Fig. 11).
INSTALLATION
(1) Install headlamp bulb to the headlamp unit.
(2) Install headlamp bulb retaining ring.
(3) Connect wiring connector to bulb.
(4) Install the headlamp unit.
(5) Install headlamp unit retaining screws.
(6) Reconnect the battery negative cable.
HEADLAMP SWITCH
DIAGNOSIS AND TESTING - HEADLAMP
SWITCH
Using a Digital Multi-meter, perform the HEAD-
LAMP SWITCH CONTINUITY test and refer to (Fig.
12).
If the Headlamp Switch is not within specifications
replace the switch.
Fig. 11 HEADLAMP
1 - HEADLAMP
2 - HEADLAMP UNIT
8L - 12 LAMPS/LIGHTING - EXTERIORRS
HEADLAMP (Continued)

OPERATION - TURN SIGNAL SYSTEM
Lane change signaling is actuated by applying par-
tial turn signal stalk movement toward the direction
desired until the indicator lamps flashes in the
instrument cluster. When the switch stalk is released
the stalk will spring back into the neutral position
turning OFF the turn signal.
With the ignition switch ON and the turn signal
switch stalk actuated left or right, current flows
through the:
²Multi-function switch
²Body Control Module
²Integrated Power Module (IPM)
²Turn indicator lamp
²Front and rear turn signal bulbs.
A chime will sound after the vehicle has traveled a
distance of approximately 1.0 mile and a speed of 15
mph, with the turn signal ON.
DIAGNOSIS AND TESTING - MULTI-FUNCTION
SWITCH
To test turn signal, headlamp beam select and opti-
cal horn portion of the multi-function switch:
(1) Remove the multi-function switch, refer to
Electrical, Lamps/Lighting - Exterior, Multi-Function
Switch, Removal, and Installation.
(2) Using an ohmmeter check the resistance read-
ings between multi-function switch pins. Refer to
Wiring Diagrams for proper pin numbers and the
MULTI-FUNCTION SWITCH RESISTANCE table.
MULTI-FUNCTION SWITCH RESISTANCE
SWITCH
POSITIONPIN NUMBER RESISTANCE
LEFT 2 AND 3 2.7V 5%
RIGHT 2 AND 3 1KV 5%
OPTICAL
HORN2 AND 4 1.7KV 5%
HI BEAM 2 AND 4 2.32KV 5%
REMOVAL
(1) Disconnect and isolate battery negative cable.
(2) Remove upper and lower steering column
shrouds. Refer to Steering, Column, Shroud,
Removal.
(3) Disconnect wire connector from back of multi-
function switch.
(4) Remove screws holding multi-function switch to
steering column adapter collar.
(5) Remove the multi-function switch.
INSTALLATION
(1) Position the switch on to the steering column.
(2) Install the two retaining screws.(3) Connect the wire harness connector.
(4) Install the upper and lower steering column
shrouds. Refer to Steering, Column, Shroud, Installa-
tion.
(5) Connect the battery negative cable.
PARK/TURN SIGNAL LAMP
REMOVAL
(1) Disconnect and isolate battery negative cable.
(2) Remove headlamp retaining screws.
(3) Twist socket counter - clockwise and remove
(Fig. 21).
(4) Pull bulb from socket.
INSTALLATION
(1) Push bulb into socket.
(2) Twist socket into headlamp.
(3) Install headlamp retaining screws.
(4) Reconnect battery negative cable.
TAIL LAMP
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the tail lamp unit. (Refer to 8 - ELEC-
TRICAL/LAMPS/LIGHTING - EXTERIOR/TAIL
LAMP UNIT - REMOVAL).
(3) Squeeze the tabs on the bulb socket and
remove from tail lamp unit (Fig. 22).
(4) Pull bulb from lamp socket.
Fig. 21 PARK/TURN SIGNAL LAMP
1 - PARK/TURN SIGNAL LAMP
2 - LAMP SOCKET
8L - 18 LAMPS/LIGHTING - EXTERIORRS
MULTI-FUNCTION SWITCH (Continued)

READING LAMP
REMOVAL
The front reading lamps are incorporated into the
overhead console. If the reading lamps require
replacement, the overhead console must be replaced.
(Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE -
REMOVAL). The rear reading lamps are incorporated
into the assist handle. If the rear reading lamps
require replacement, the assist handle must be
replaced. (Refer to 23 - BODY/INTERIOR/ASSIST
HANDLE - REMOVAL). The bulbs can be serviced
separately.
(1) Disconnect and isolate the battery negative
cable.
(2) Using a flat bladed tool, pry off the lamp lens
(Fig. 4), (Fig. 5).
(3) Remove bulb from lamp (Fig. 6), (Fig. 7).
INSTALLATION
(1) Install bulb to lamp.
(2) Press lens into place.
(3) Reconnect the battery negative cable.
Fig. 4 OVERHEAD CONSOLE
1 - LAMP LENS
2 - OVERHEAD CONSOLE
Fig. 5 COURTESY/READING LAMP
1 - HVAC LOUVER
2 - ASSIST HANDLE
3 - LAMP LENS
Fig. 6 OVERHEAD CONSOLE LAMP
1 - LAMP
2 - OVERHEAD CONSOLE
Fig. 7 COURTESY/READING LAMP
1 - COURTESY/READING LAMP
RSLAMPS/LIGHTING - INTERIOR8L-23

(2) Turn the ignition switch to the On position.
(3)
Following completion of these tests, the electron-
ics module will display one of the following messages:
a.Pass Self Test (EVIC only), PASS (CT,
CMTC)- The electronics module is working properly.
b.Failed Self Test (EVIC only), FAIL (CT,
CMTC)- The electronics module has an internal fail-
ure. The electronics module is faulty and must be
replaced.
c.Failed J1850 Communication (EVIC only),
BUS (CT, CMTC)- The electronics module is not
receiving proper message input through the J1850
PCI data bus circuit. This can result from one or
more faulty electronic modules in the vehicle, or from
a faulty PCI data bus. The use of a DRB IIItscan
tool and the proper Diagnostic Procedures manual
are required for further diagnosis.
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.
Refer to Compass Variation Adjustment in the Stan-
dard Procedures section of this group.
NOTE: If the compass reading displays dashes, and
only ªCALº appears in the display, demagnetizing
may be necessary to remove excessive residual
magnetic fields from the vehicle. Refer to Compass
Demagnetizing in the Standard Procedures section
of this group.
STANDARD PROCEDURE
STANDARD PROCEDURE - READING/
COURTESY LAMP REPLACEMENT
(1) Open hood, disconnect and isolate the negative
battery cable remote terminal from the remote bat-
tery post.
(2) Remove the reading/courtesy lamp lens. Using
a trim stick, gently pry the forward edge of the read-
ing/courtesy lamp lens outward.
(3) Remove the reading/courtesy lamp socket from
the overhead console. Rotate the reading/courtesy
lamp socket one quarter turn counter clockwise.
(4) Remove the lamp and socket assembly.
(5) Reverse the above procedure to install.
STANDARD PROCEDURE - MODULE LAMP
REPLACEMENT
(1) Remove the overhead console (Refer to 8 -
ELECTRICAL/OVERHEAD CONSOLE - REMOVAL).
(2) Using a flat blade screwdriver twist out socket/
lamp (Fig. 1).(3) Replace lamp(s) as necessary.
STANDARD PROCEDURE - 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.
This allows the compass unit to compensate for small
changes in the residual magnetism that the vehicle
may acquire during normal use. If the compass read-
ings appear to be erratic or out of calibration, per-
form the following calibration procedure. Also, new
service replacement Electronic Modules (EVIC,
CMTC, CT) must have their compass calibrated
using this procedure. Do not attempt to calibrate the
compass near large metal objects such as other vehi-
cles, large buildings, or bridges; or, near overhead or
underground power lines.
NOTE: Whenever the compass is calibrated manu-
ally, the variance number must also be reset. Refer
to Compass Variation Adjustment in this group.
Fig. 1 EVIC
1 - OVERHEAD CONSOLE HOUSING
2 - EVIC/CMTC MODULE
3 - ILLUMINATION LAMPS
4 - MODULE RETAINING SCREWS
RSMESSAGE SYSTEMS8M-3
OVERHEAD CONSOLE (Continued)

(7) Connect the degaussing tool to an electrical
outlet, while keeping the tool at least 61 centimeters
(2 feet) away from the compass unit.
(8) Slowly approach the center line of the roof
panel at the windshield header, with the degaussing
tool connected.
(9) Contact the roof panel with the plastic coated
tip of the degaussing tool. Be sure that the template
is in place to avoid scratching the roof panel. Using a
slow, back-and-forth sweeping motion, and allowing
13 millimeters (0.50 inch) between passes, move the
tool at least 11 centimeters (4 inches) to each side of
the roof center line, and 28 centimeters (11 inches)
back from the windshield header.
(10) With the degaussing tool still energized,
slowly back it away from the roof panel. When the
tip of the tool is at least 61 centimeters (2 feet) from
the roof panel, disconnect the tool.
(11) Calibrate the compass and adjust the compass
variance (Refer to 8 - ELECTRICAL/OVERHEAD
CONSOLE - STANDARD PROCEDURE).
STANDARD PROCEDURE - COMPASS
VARIATION ADJUSTMENT
Compass variance, also known as magnetic decli-
nation, is the difference in angle between magnetic
north and true geographic north. In some geographic
locations, the difference between magnetic and geo-
graphic north is great enough to cause the compassto give false readings. If this problem occurs, the
compass variance setting may need to be changed.
To set the compass variance:
(1) Using the Variance Settings map, find your
geographic location and note the zone number (Fig.
4).
(2) Turn the ignition switch to the On position. If
the compass/thermometer data is not currently being
displayed, momentarily depress and release the C/T
push button to reach the compass/thermometer dis-
play.
(3) On Electronic Vehicle Information Center
(EVIC) and Compass Mini-Trip Computer (CMTC)
equipped vehicles depress the Reset push button and
hold the button down until ªVAR = XXº appears in
the display. This takes about five seconds. On Com-
pass Temperature Module (CT) equipped vehicles
depress the C/T push button and US/M push button
down until ªVAR = XXº appears in the display. This
takes about five seconds.
(4) Release the push button(s). ªVAR =XX º will
remain in the display. ªXXº equals the current vari-
ance zone setting.
(5) On Electronic Vehicle Information Center
(EVIC) and Compass Mini-Trip Computer (CMTC)
equipped vehicles momentarily depress and release
theSTEPpush button to step through the zone
numbers, until the zone number for your geographic
location appears in the display. On Compass Temper-
ature Module (CT) equipped vehicles depress the
Fig. 4 Variance Settings
RSMESSAGE SYSTEMS8M-5
OVERHEAD CONSOLE (Continued)

US/Mpush button to step through the zone numbers,
until the zone number for your geographic location
appears in the display.
(6) On Electronic Vehicle Information Center
(EVIC) and Compass Mini-Trip Computer (CMTC)
equipped vehicles momentarily depress and release
theRESETpush button to enter the displayed zone
number into the EVIC/CMTC module memory. On
Compass Temperature Module (CT) equipped vehicles
depress theC/Tpush button to enter the displayed
zone number into the electronic module memory.
(7) Confirm that the correct directions are now
indicated by the compass.
REMOVAL - OVERHEAD CONSOLE
(1) Disconnect and isolate the remote negative bat-
tery cable.
(2) Remove the overhead console retaining screw,
located in the front of console.
(3) Using your fingertips, grasp the sides of the
overhead console and pull straight down evenly to
disengage the two snap clips at the rear of the unit.
(4) Lower the overhead console far enough to
access the wire harness connectors.
(5) Disconnect the EVIC, CMTC or CT electronic
module and the reading/courtesy lamps electrical
connector.
(6) Remove the overhead console from the vehicle.
INSTALLATION
(1) Position the overhead console in the vehicle.
(2) Connect the EVIC, CMTC or CT electronic
module and the reading/courtesy lamps electrical
connector.
(3) Using your fingertips, grasp the sides of the
overhead console and push straight up evenly to
engage the two snap clips at the rear of the unit.
CAUTION: DO NOT PRESS ON THE SUNGLASS
STORAGE BIN DOOR. DAMAGE TO THE DOOR MAY
RESULT.
(4) Install the overhead console retaining screw,
located in the front of console. Torque the screw to
1.2 N´m (10 in. lbs.).
(5) Connect the remote negative battery cable.
SPECIAL TOOLS
OVERHEAD CONSOLE
ELECTRONIC VEHICLE INFO
CENTER
DESCRIPTION
The Electronic Vehicle Information Center (EVIC)
is a module located in the overhead console on some
models. The EVIC module features a large Vacuum
Fluorescent Display (VFD) screen for displaying
information, and back-lit push button switches
labeled C/T (compass/thermometer), RESET, STEP,
and MENU.
The EVIC module contains a central processing
unit and interfaces with other electronic modules in
the vehicle over the Programmable Communications
Interface (PCI) J1850 data bus circuit. The PCI data
bus circuit allows the sharing of sensor information.
This helps to reduce wire harness complexity, reduce
internal controller hardware, and reduce component
sensor current loads. At the same time, this system
provides increased reliability, enhanced diagnostics,
and allows the addition of many new feature capabil-
ities.
The EVIC ªMenuº push button provides the vehicle
operator with a user interface, which allows the
selection of several optional customer programmable
electronic features to suit individual preferences.
Refer toELECTRONIC VEHICLE INFORMA-
TION CENTER PROGRAMMINGin the Standard
Procedures section of this group for more information
on the customer programmable feature options.
If the vehicle is equipped with the optional univer-
sal transmitter transceiver, the EVIC will also dis-
play messages and an icon indicating when the
universal transmitter transceiver is being trained,
which of the three transmitter buttons is transmit-
ting, and when the transceiver is cleared.
Data input for all EVIC functions, including VFD
dimming level, is received through the J1850 PCI
data bus circuit. The EVIC module uses its internal
programming and all of its data inputs to calculate
and display the requested data. If the data displayed
is incorrect, perform the self-diagnostic tests as
described in this group. If these tests prove inconclu-
DEGAUSSING TOOL #6029
8M - 6 MESSAGE SYSTEMSRS
OVERHEAD CONSOLE (Continued)

with the optional Auto Headlamps. The options
include Yes and No. The default is No. When Yes is
selected, the headlamps will turn on automatically
when the windshield wipers are turned on. The head-
lamps will turn off when the wipers are turned off,
as long as the headlamp switch is in the Auto or Off
positions. When No is selected, the headlamps will
only turn on if manually selected or if the Auto mode
is selected and the outside ambient light levels dic-
tate that they should be on.
²RETRAIN TIRE SENSORS?- This program-
mable feature only applies to vehicles equipped with
the optional Tire Pressure Monitoring System. The
options include Yes and No. The default is No. When
Yes is selected, and the menu button is depressed the
EVIC will enter the training mode, starting with the
left front tire.
²POWER ACCESSORY DELAY?- The options
include Yes and No. The default is Yes. When No is
selected, the accessory powered components will turn
off automatically when the ignition key is turned off.
When Yes is selected, the accessory powered compo-
nents will remain on for 45 seconds when the igni-
tion key is turned off.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove overhead console. Refer to Overhead
Console Removal and Installation in this section(Re-
fer to 8 - ELECTRICAL/OVERHEAD CONSOLE -
REMOVAL).
(3) Remove the ten screws holding the EVIC mod-
ule in the overhead console.
(4) Remove EVIC module from console assembly.
NOTE: If the EVIC module is being replaced, the tire
pressure monitoring system (if equipped) must be
retrained. Refer to the Tires/Wheels section of this
manual for detailed instructions.
INSTALLATION
(1) Position the EVIC module in the overhead con-
sole.
(2) Install the ten screws holding the EVIC module
in the overhead console.
(3) Install the overhead console (Refer to 8 -
ELECTRICAL/OVERHEAD CONSOLE - INSTALLA-
TION).
(4) Connect the battery negative cable.
NOTE: If the EVIC module is being replaced, the tire
pressure monitoring system (if equipped) must be
retrained. Refer to the Tires/Wheels section of this
manual for detailed instructions.NOTE: If a new EVIC module has been installed, the
compass will have to be calibrated and the variance
set. Refer to compass variation adjustment and
compass calibration in standard procedures.
COMPASS/MINI-TRIP
COMPUTER
DESCRIPTION
The Compass Mini-Trip Computer (CMTC) and
Compass Temperature (CT) computer are modules
located in the overhead console. Vehicles are
equipped with either the CMTC or the CT computers
not both. The CMTC is different in the fact that it is
equipped with the mini-trip feature. The CMTC, CT
consists of a electronic control module with a vacuum
fluorescent display (VFD) and function switches. The
CMTC, CT consists of a electronic module that dis-
plays compass, trip computer (CMTC only), and tem-
perature features. Actuating the STEP push button
(CMTC only) will cause the CMTC to change mode of
operation when ignition is ON. Actuating the STEP
push button (CMTC only) will cause the CMTC to
change mode of operation when ignition is ON.
Example:
²Average miles per gallon (ECO)
²Distance to empty (DTE)
²Instant miles per gallon (ECO)
²Trip odometer (ODO)
²Elapsed time (ET)
²Off
Actuating the C/T push button will cause the
CMTC, CT to change to Compass/Temperature dis-
play.
OPERATION
The Compass Mini-Trip Computer (CMTC), Com-
pass Temperature (CT) module in the overhead con-
sole has buttons used to select various functions. The
CMTC, CT selector buttons will not operate until the
ignition is in the RUN position.
When the ignition switch is first turned to the
RUN position the CMTC, CT display;
²Blanks momentarily
²All segments of the VFD will light for one sec-
ond
²Blanks momentarily
²Returns to the last mode setting selected before
the ignition was last switched OFF.
RSMESSAGE SYSTEMS8M-9
ELECTRONIC VEHICLE INFO CENTER (Continued)

DIAGNOSIS AND TESTING - COMPASS
MINI-TRIP COMPUTER
Compass Mini-Trip Computer (CMTC) and Com-
pass Temperature (CT) data is obtained from the
Body Control Module (BCM) on the J1850 Data Bus
circuit. The CMTC and CT will display dashes (- -)
for any of the screens it did not receive the bus mes-
sages. The label corresponding to the missing infor-
mation will be lit. If no compass mini-trip computer
data is displayed, check the J1850 Data Bus circuit
communications and the BCM. If the brightness level
is improper check the J1850 Data Bus circuit.
The DRB IIItis recommended for checking the
J1850 Data Bus circuit and the BCM. Perform the
CMTC, CT self diagnosis before replacing the CMTC
or CT module.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove overhead console(Refer to 8 - ELEC-
TRICAL/OVERHEAD CONSOLE - REMOVAL).
(3) Remove the screws holding Compass Mini-Trip
Computer module in the overhead console.
(4) Remove CMTC module from console assembly.
INSTALLATION
(1) Position the compass mini-trip computer mod-
ule in the overhead console.
(2) Install the ten screws holding the compass
mini-trip computer module in the overhead console.
(3) Install the overhead console (Refer to 8 -
ELECTRICAL/OVERHEAD CONSOLE - INSTALLA-
TION).
(4) Connect the battery negative cable.
NOTE: If a new EVIC module has been installed, the
compass will have to be calibrated and the variance
set. Refer to compass variation adjustment and
compass calibration in standard procedures.
UNIVERSAL TRANSMITTER
DESCRIPTION
On some RS models a Universal Transmitter trans-
ceiver is standard factory-installed equipment. The
universal transmitter transceiver is integral to the
Electronic Vehicle Information Center (EVIC) and the
Compass Mini-Trip Computer (CMTC) modules,
which is located in the overhead console. The only
visible component of the universal transmitter are
the three transmitter push buttons centered between
the modules push buttons located just rearward of
the display screen in the overhead console. The threeuniversal transmitter push buttons are identified
with one, two or three light indicators so that they be
easily identified by sight or by feel.
Each of the three universal transmitter push but-
tons controls an independent radio transmitter chan-
nel. Each of these three channels can be trained to
transmit a different radio frequency signal for the
remote operation of garage door openers, motorized
gate openers, home or office lighting, security sys-
tems or just about any other device that can be
equipped with a radio receiver in the 286 to 399
MegaHertz (MHz) frequency range for remote opera-
tion. The universal transmitter is capable of operat-
ing systems using either rolling code or non-rolling
code technology.
The electronics module displays messages and a
small house-shaped icon with one, two or three dots
corresponding to the three transmitter buttons to
indicate the status of the universal transmitter. The
EVIC messages are:
²Cleared Channels- Indicates that all of the
transmitter codes stored in the universal transmitter
have been successfully cleared.
²Training- Indicates that the universal trans-
mitter is in its transmitter learning mode.
²Trained- Indicates that the universal transmit-
ter has successfully acquired a new transmitter code.
²Transmit- Indicates that a trained universal
transmitter button has been depressed and that the
universal transmitter is transmitting.
The universal transmitter cannot be repaired, and
is available for service only as a unit with the EVIC
or CMTC modules. If any of these components is
faulty or damaged, the complete EVIC or CMTC
module must be replaced.
OPERATION
The universal transmitter operates on a non-
switched source of battery current so the unit will
remain functional, regardless of the ignition switch
position. For more information on the features, pro-
gramming procedures and operation of the universal
transmitter, see the owner's manual in the vehicle
glove box.
DIAGNOSIS AND TESTING - UNIVERSAL
TRANSMITTER
If the Universal Transmitter is inoperative, but the
Electronic Vehicle Information Center (EVIC) is oper-
ating normally, see the owner's manual in the vehicle
glove box for instructions on training the Transmit-
ter. Retrain the Transmitter with a known good
transmitter as instructed in the owner's manual and
test the Transmitter operation again. If the unit is
still inoperative, test the universal transmitter with
Radio Frequency Detector special tool. If both the
8M - 10 MESSAGE SYSTEMSRS
COMPASS/MINI-TRIP COMPUTER (Continued)