Dodge Message Service Manual
DR MESSAGE SYSTEMS 8M - 1
MESSAGE SYSTEMS
TABLE OF CONTENTS
page page
OVERHEAD CONSOLE
DESCRIPTION ..........................1
OPERATION ............................2
DIAGNOSIS AND TESTING - OVERHEAD
CONSOLE ............................2
STANDARD PROCEDURE
STANDARD PROCEDURE - READING/
COURTESY LAMP REPLACEMENT .........3
STANDARD PROCEDURE - MODULE LENS
REPLACEMENT .......................3
STANDARD PROCEDURE - MODULE LAMP
REPLACEMENT .......................3
STANDARD PROCEDURE - COMPASS
CALIBRATION .........................3
STANDARD PROCEDURE - COMPASS
DEMAGNETIZING ......................4
STANDARD PROCEDURE - COMPASS
VARIATION ADJUSTMENT................4
REMOVAL
OVERHEAD CONSOLE REMOVAL .........5
INSTALLATION ..........................5
SPECIAL TOOLS
OVERHEAD CONSOLE ..................6
COMPASS/MINI-TRIP COMPUTER
DESCRIPTION ..........................6
OPERATION ............................7
DIAGNOSIS AND TESTING - COMPASS
MINI-TRIP COMPUTER ..................7
REMOVAL .............................7
INSTALLATION ..........................7
ELECTRONIC VEHICLE INFO CENTER
DESCRIPTION ..........................7
OPERATION ............................8
DIAGNOSIS AND TESTING - ELECTRONIC
VEHICLE INFORMATION CENTER .........8
STANDARD PROCEDURE - ELECTRONIC
VEHICLE INFORMATION CENTER
PROGRAMMING .......................8
REMOVAL .............................10
INSTALLATION .........................10
AMBIENT TEMP SENSOR
DESCRIPTION .........................10
OPERATION ...........................10
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - AMBIENT
TEMPERATURE SENSOR ...............11
DIAGNOSIS AND TESTING - AMBIENT
TEMPERATURE SENSOR CIRCUIT ........11
REMOVAL .............................11
INSTALLATION .........................11
UNIVERSAL TRANSMITTER
DESCRIPTION .........................11
OPERATION ...........................12
DIAGNOSIS AND TESTING - UNIVERSAL
TRANSMITTER .......................12
STANDARD PROCEDURE
STANDARD PROCEDURE - ERASING
TRANSMITTER CODES .................12
STANDARD PROCEDURE - SETTING
TRANSMITTER CODES .................12
REMOVAL .............................13
OVERHEAD CONSOLE
DESCRIPTION
Two different overhead consoles are available on
DR models. The Electronic Vehicle Information Center (EVIC) (Fig. 1) or Compass Mini-Trip Computer
(CMTC). All consoles are equipped with two reading/
courtesy lamps. The overhead console is mounted
with screws and two snap clips to a molded plastic
retainer bracket located above the headliner.
COMPASS DISPLAY
All the available overhead consoles on this model
include Compass information. While in the compass/
temperature mode, 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). The self-calibrating compass unit
requires no adjusting in normal use. The only calibration that may prove necessary is to drive the vehicle at 5 to 8 kilometers-per-hour (3 to 5 miles-perhour), on level ground in a square shaped pattern.
This will reorient the compass unit to its vehicle.
The compass unit also will compensate for magnetism the body of the vehicle may acquire during normal 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 procession flag can exceed the compensating ability of
the compass unit if placed on the roof panel. Magnetic bit drivers used on the fasteners that hold the
8M - 2 MESSAGE SYSTEMS DR
OVERHEAD CONSOLE (Continued)
ent temperature sensor, refer to Ambient Temperature Sensor later in this section.
Following are general descriptions of the major
components used in the overhead console. Refer to
Wiring Diagrams for complete circuit schematics.
OPERATION
Refer to the vehicle Owner’s Manual for specific
operation of each overhead console and its systems.
DIAGNOSIS AND TESTING - OVERHEAD
CONSOLE
If the problem with the overhead console is an
inaccurate or scrambled display, refer to SELF-DI-
AGNOSTIC TEST later in this text. If the problem
with the overhead console is incorrect Vacuum Fluorescent Display (VFD) dimming levels, use a DRB
IIIt scan tool and the proper Diagnostic Procedures
manual to test for the correct dimming message
inputs being received from the Body Control Module
(BCM) or Front Control Module (FCM) over the
Fig. 1 DR OVERHEAD CONSOLE – EVIC
overhead console assembly to the roof header can
also affect compass operation. If the vehicle roof
should become magnetized, the demagnetizing and
calibration procedures found in this section may be
required to restore proper compass operation.
TEMPERATURE DISPLAY
All the available overhead consoles on this model
include Temperature information. The temperature
displays the outside ambient temperature in whole
degrees. The temperature display can be toggled
from Fahrenheit to Celsius by selecting the desired
U.S./Metric option from the customer programmable
features. The displayed temperature is not an instant
reading of conditions, but an average temperature. It
may take the temperature display several minutes to
respond to a major temperature change, such as driving out of a heated garage into winter temperatures.
When the ignition switch is turned to the Off position, the last displayed temperature reading stays in
the electronic control modules, (CMTC, EVIC) memory. When the ignition switch is turned to the On
position again, the electronic module will display the
memory temperature for one minute; then update the
display to the current average temperature reading
within five minutes.
The temperature function is supported by an ambient temperature sensor. This sensor is mounted outside the passenger compartment near the front and
center of the vehicle, and is hard wired to the Front
Control Module (FCM). The FCM sends temperature
status messages to the module over the J1850 PCI
data bus circuit. For more information on the ambi-
J1850 Programmable Communications Interface
(PCI) data bus circuit. If the problem is a no-display
condition, use the following procedure. For complete
circuit diagrams, refer to Overhead Console in the
Wiring Diagrams section of the service manual.
(1) Remove the overhead console from the headliner (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - REMOVAL).
(2) Check for battery voltage at the overhead console electrical connector. Refer to Wiring for connector information. If OK, go to Step 3. If not OK, Check
for battery voltage at the appropriate B(+) fuse in the
integrated power module, repair the open fused B(+)
circuit as required.
(3) Turn the ignition switch to the On position.
Check the fused ignition switch output circuit(s) at
the overhead console electrical connector. If OK, go to
Step 4. If not OK, repair the open or shorted circuit
as required.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Check for continuity between the ground circuit cavity of the overhead console electrical connector and a
good ground. There should be continuity. If OK, refer
to SELF-DIAGNOSTIC TEST below for further
diagnosis of the electronics module and the J1850
PCI data bus circuit. If not OK, repair the open
ground circuit as required.
SELF-DIAGNOSTIC TEST
A self-diagnostic test is built-in to the module to
determine that the electronics module is operating
properly, and that all the J1850 PCI data bus messages are being received for proper operation. To perform the self-diagnostic test proceed as follows:
DR MESSAGE SYSTEMS 8M - 3
OVERHEAD CONSOLE (Continued)
(1) With the ignition switch in the Off position,
simultaneously depress and hold the STEP and
RESET buttons.
(2) Turn the ignition switch to the On position.
(3) Following completion of the test, the electronics
module will display one of the following messages:
a. Pass Self Test (EVIC only), PASS (CMTC) -
The electronics module is working properly.
b. Failed Self Test (EVIC only), FAIL (CMTC) -
The electronics module has an internal failure. The
electronics module is faulty and must be replaced.
c. Failed J1850 Communication (EVIC only),
BUS (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 IIIt scan 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 magnetic field strength, based on geographic location.
Refer to Compass Variation Adjustment in the Standard Procedures section of this group.
STANDARD PROCEDURE - MODULE LENS
REPLACEMENT
(1) Remove the overhead console (Refer to 8 ELECTRICAL/OVERHEAD CONSOLE - REMOVAL).
(2) Remove the electronics module from the overhead console. Refer to the procedure later in this section.
(3) Unsnap the lens from the module and replace
lens as necessary.
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. 2).
(3) Replace lamp(s) as necessary.
NOTE: If the compass reading displays dashes, and
only “CAL” 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.
(2) Remove the reading/courtesy lamp lens. Using
a trim stick, gently pry the forward edge of the reading/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.
Fig. 2 Top of Overhead Console
1 - OVERHEAD CONSOLE HOUSING
2 - EVIC/CMTC MODULE
3 - ILLUMINATION LAMPS
4 - MODULE RETAINING SCREWS
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 servicing the overhead console.
8M - 4 MESSAGE SYSTEMS DR
OVERHEAD CONSOLE (Continued)
The electronic compass unit features a self-calibrating design, which simplifies the calibration procedure. 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 readings appear to be erratic or out of calibration, perform the following calibration procedure. Also, new
service replacement Electronic Modules (EVIC,
CMTC) must have their compass calibrated using
this procedure. Do not attempt to calibrate the compass near large metal objects such as other vehicles,
large buildings, or bridges; or, near overhead or
underground power lines.
NOTE: Whenever the compass is calibrated manually, the variance number must also be reset. Refer
to Compass Variation Adjustment in this group.
To calibrate the compass manually proceed as follows:
(1) Turn the ignition switch to the On position. If
the compass/temperature data is not currently being
displayed, momentarily depress and release the C/T
push button to reach the compass/temperature display.
(2) Depress the RESET push button and hold the
button down until “CAL” appears in the display. This
takes about ten seconds, and appears about five seconds after “VAR = XX” is displayed.
(3) Release the RESET push button.
(4) Drive the vehicle on a level surface, away from
large metal objects and power lines, through three or
more complete turns at between five and eight kilometers-per-hour (three and five miles-per-hour) in
not less than 48 seconds. The “CAL” message will
disappear from the display to indicate that the compass is now calibrated.
NOTE: If the “CAL” message remains in the display,
either there is excessive magnetism near the compass, or the unit is faulty. Repeat the calibration
procedure one more time.
NOTE: If the wrong direction is still indicated in the
compass display, the area selected for calibration
may be too close to a strong magnetic field. Repeat
the calibration procedure in another location.
overhead console. Equivalent units must be rated as
continuous duty for 110/115 volts and 60 Hz. They
must also have a field strength of over 350 gauss at 7
millimeters (0.25 inch) beyond the tip of the probe.
To demagnetize the roof panel and the overhead
console forward mounting screw, proceed as follows:
(1) Be certain that the ignition switch is in the Off
position, before you begin the demagnetizing procedure.
(2) Connect the degaussing tool to an electrical
outlet, while keeping the tool at least 61 centimeters
(2 feet) away from the compass unit.
(3) Slowly approach the head of the overhead console mounting screw with the degaussing tool connected.
(4) Contact the head of the screw with the plastic
coated tip of the degaussing tool for about two seconds.
(5) With the degaussing tool still energized, slowly
back it away from the screw. When the tip of the tool
is at least 61 centimeters (2 feet) from the screw
head, disconnect the tool.
(6) Place a piece of paper approximately 22 by 28
centimeters (8.5 by 11 inches), oriented on the vehicle
lengthwise from front to rear, on the center line of
the roof at the windshield header (Fig. 3). The purpose of the paper is to protect the roof panel from
scratches, and to define the area to be demagnetized.
(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
DEMAGNETIZING
A degaussing tool (Special Tool 6029) is used to
demagnetize, or degauss, the overhead console forward mounting screw and the roof panel above the
STANDARD PROCEDURE - COMPASS
VARIATION ADJUSTMENT
Compass variance, also known as magnetic declination, is the difference in angle between magnetic
north and true geographic north. In some geographic
locations, the difference between magnetic and geo-
Loading...