located in the center of the instrument panel,
between the HVAC outlets. The Compass Mini-Trip
Computer is an electronic control module with a vac-
uum fluorescent display and two function buttons
(Fig. 1). The Compass Mini-Trip Computer communi-
cates on the Programmable Communication Interface
(PCI) Data Bus Circuit.

The information that is available via activation of

the STEP button follows:

• Compass and Temperature

• Average Fuel Economy

• Distance to Empty

• Instantaneous Fuel Economy

• Trip Odometer

• Elapsed Time

• Blank Screen
The only information that can be reset includes;

Average Fuel Economy, Trip Odometer and Elapsed
Time. To reset the display, press the STEP button
until the desired information is displayed and press
both function buttons at the same time.

The

Compass

Mini-Trip

Computer

cannot

repaired and, if faulty or damaged it must be
replaced. The incandescent lamp for the STEP and
US/METRIC button illumination is serviceable. Con-
sult your Mopar

t Parts Catalog for a specific part

number.

Fig. 1 Compass/Mini-Trip Computer

MESSAGE SYSTEMS

8M - 1

OPERATION

Actuation of the STEP button will cause the Com-

pass Mini-Trip Computer to change mode of opera-
tion and actuation of the US/M button will toggle
between English and Metric unit of measurement. A
reset of the trip computer information is accom-
plished by actuating the Step and US/M buttons
simultaneously. To reset only the trip condition cur-
rently displayed, press and release the STEP and
US/M buttons simultaneously for one second until a
chime sounds. To reset all trip conditions, hold down
the STEP and US/M buttons simultaneously (about 2
seconds) until a second chime sounds and then
release the buttons.

The Compass Mini-Trip Computer is active only

when the ignition switch is in the ON position. When
the ignition switch is turned ON, the Compass Mini-
Trip Computer will return to the last function screen
that was displayed prior to the ignition being turned
OFF.

COMPASS MINI-TRIP COMPUTER MESSAGES

The Compass Mini-Trip Computer will not display

information for any of the screens for which it did
not receive the proper data over the Programmable
Communication Interface (PCI) data bus for that par-
ticular screen. Refer to Mini Trip Computer Diagno-
sis and Testing in this section for more information.

The Compass Mini-Trip Computer receives the fol-

lowing messages from the Body Control Module
(BCM):

• Verification of US/M Status

• Display Brightness (Dimming) and Lamp Status

• Trip Odometer Data

• Elapsed Ignition On Time Data

• Fuel Efficiency (Average and Instantaneous)

• Distance to Empty

• Outside Temperature
The Compass Mini-Trip Computer transmits the

following messages to the Body Control Module
(BCM):

• Status Request : Beep, Reset, US/M Toggle

• Current Display

• Compass Heading
The Compass Mini-Trip Computer receives the fol-

lowing message from the Single Board Engine Con-
troller (SBEC):

• Vehicle Speed

DIAGNOSIS AND TESTING - COMPASS
MINI-TRIP COMPUTER

The Compass Mini-Trip Computer is capable of

performing a diagnostic self check on many of its
internal functions. Compass Mini-Trip Computer
diagnostics may be performed using a DRB lll

t scan

tool and the proper Body Diagnostic Procedures Man-
ual or by the following procedure.

(1) With the ignition switch in the OFF position,

press both the US/M and STEP button.

(2) Turn ignition switch to the ON position.
The Compass Mini-Trip Computer will perform

internal checks while lighting all segments of the
vacuum florescent display. Upon completion of the
internal check, the Compass Mini-Trip Computer will
display one of five messages;

• PASS - Passed Self Test

• FAIL - Failed Self Test

• BUS - Not receiving PCI Data Bus messages

from Single Board Engine Controller (SBEC) and
Body Control Module (BCM)

• bus1 - Not receiving PCI Data Bus messages

from Single Board Engine Controller (SBEC)

• bus2 - Not receiving PCI Data Bus messages

from Body Control Module (BCM)

If any segment of the Compass Mini-Trip Com-

puter fails to light replace the computer.

If FAIL is displayed, repeat the test. If it still fails,

replace the Compass Mini-Trip Computer module.

If a BUS(X) message is displayed, check the corre-

sponding PCI Data Bus Circuit for proper operation.
Refer to the appropriate diagnostic manual for addi-
tional diagnostics.

COMPASS CALIBRATION

If the “CAL” indicator is lit, the compass should be

calibrated. The vehicle will be shipped with the
“CAL” light on. If during normal driving, the com-
pass appears to be inaccurate, calibration may be
required.

To Calibrate the Compass

(1) Put the CMTC into COMPASS/TEMP mode

using the STEP button.

(2) Depress the STEP and US/M buttons simulta-

neously until CAL appears in the display.

(3) Drive the vehicle in about two circles (Fig. 2)

on a level surface in an area free of large metal
objects, such as other vehicles, large buildings,
bridges, underground cables, railroad tracks, etc.

NOTE: The compass will usually calibrate after the
vehicle has been driven in a circle comprising five
quadrants or one and a quarter turns.

When the “CAL” indicator goes off, the compass is

calibrated and should display correct headings (for
all conditions). Verify proper calibration by checking
North (N), South (S), East (E), and West (W). If the
compass does not appear accurate, repeat the calibra-
tion procedure in another area.

8M - 2

COMPASS/MINI-TRIP COMPUTER

COMPASS/MINI-TRIP COMPUTER (Continued)

VARIANCE SETTING PROCEDURE

Variance is the difference between magnetic North

and geographic North.

(1) Depress the STEP and US/M buttons simulta-

neously until VAR appears in the display, then
release the buttons.

(2) The CMTC will display the current variance

zone (1-15). If the variance needs to be changed use
the STEP button to select the correct zone number
from the figure below (Fig. 3). After selecting the
desired variance zone, the CMTC will return to nor-
mal operation after 5 seconds or by pressing the
STEP and US/M buttons simultaneously.

Fig. 3 Variance Settings

Fig. 2 Compass Calibration

1 - RADIUS = 15

– 45

/ SPEED = 7–10 mph

COMPASS/MINI-TRIP COMPUTER

8M - 3

COMPASS/MINI-TRIP COMPUTER (Continued)

REMOVAL

(1) Disconnect and isolate the battery negative

remote cable.

(2) Remove the Instrument Cluster Bezel from the

vehicle (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - REMOVAL).

(3) With the cluster bezel removed, remove the two

screws attaching the Compass Mini-Trip Computer
(Traveler) Module to the cluster bezel (Fig. 4).

(4) Unsnap the retaining clip (Fig. 4) and remove

Compass Mini-Trip Computer (Traveler) from the
cluster bezel.

INSTALLATION

(1) Snap the Compass Mini-Trip Computer on the

cluster bezel and install the retaining screws.

(2) Install the Instrument Cluster Bezel (Refer to

BODY/INSTRUMENT

PANEL/CLUSTER

BEZEL - INSTALLATION).

(3) Connect the battery negative remote cable.

Fig. 4 Compass/Mini-Trip Computer Retaining

Screws

1 - COMPASS MINI-TRIP COMPUTER (TRAVELER)
2 - RETAINING SCREWS
3 - RETAINING CLIP

8M - 4

COMPASS/MINI-TRIP COMPUTER

COMPASS/MINI-TRIP COMPUTER (Continued)

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