Chrysler 1998 Voyager Service Manual page 551

NS
DESCRIPTION AND OPERATION
COMPASS MINI-TRIP COMPUTER (CMTC) . . . . 1
COMPASS/TEMPERATURE MINI TRIP
COMPUTER SELF-DIAGNOSTIC TEST . . . . . . . 1
THERMOMETER AND COMPASS . . . . . . . . . . . . 2
UNIVERSAL TRANSMITTER . . . . . . . . . . . . . . . . 2
DIAGNOSIS AND TESTING
READING/DOME LAMP DIAGNOSIS . . . . . . . . . 3
TRAVELER MESSAGES . . . . . . . . . . . . . . . . . . . . 3
UNIVERSAL TRANSMITTER . . . . . . . . . . . . . . . . 3
SERVICE PROCEDURES
COMPASS CALIBRATION PROCEDURE (FAST
METHOD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
COMPASS CALIBRATION PROCEDURE . . . . . . . 4
DEMAGNETIZING PROCEDURE . . . . . . . . . . . . . 4
DESCRIPTION AND OPERATION
COMPASS/TEMPERATURE MINI TRIP COMPUTER
SELF-DIAGNOSTIC TEST
The CMTC is capable of performing a diagnostic
self check on many of its internal functions. CMTC
diagnostics may be performed using a scan tool
(DRB) and the proper Body Diagnostic Procedures
manual 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 CMTC will perform internal checks while
lighting all segments of the vacuum florescent dis-
play. Upon completion of the internal check, the
CMTC will display.
• PASS
• FAIL
• CCd
If any segment of the CMTC fails to light replace
the module.
If FAIL is displayed, replace the module.
If CCd is displayed, check the CCD and Body Con-
trol Module (BCM) for proper operation, refer to the
appropriate diagnostic test procedures manual If the
CCD and the BCM are OK, replace the CMTC mod-
ule.
For additional diagnostic information on the CMTC
and for identifying CMTC problems, refer to the
proper Body Diagnostic Procedures manual.
OVERHEAD CONSOLE
CONTENTS
page
REMOVAL AND INSTALLATION
SPECIAL TOOLS
COMPASS MINI-TRIP COMPUTER (CMTC)
is located in the overhead console. CMTC consists of
a electronic control module with a vacuum fluores-
cent display (VFD) and function switches. The CMTC
consists of a electronic module that displays compass,
trip computer, and temperature features. Actuating
the STEP switch will cause the CMTC to change
mode of operation when ignition is ON. Example:
three buttons used to select various functions. The
CMTC selector buttons will not operate until the
ignition is in the RUN position (Fig. 1).
RUN position the CMTC display;
ond
the ignition was last switched OFF.
OVERHEAD CONSOLE
UNIVERSAL TRANSMITTER . . . . . . . . . . . . . . . . 5
AMBIENT TEMPERATURE SENSOR . . . . . . . . . . 5
COMPASS MINI-TRIP COMPUTER (CMTC)
LAMP BULBS . . . . . . . . . . . . . . . . . . . . . . . . . 6
COMPASS MINI-TRIP COMPUTER (CMTC)
MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
FRONT HEADER READING/COURTESY LAMP . . 6
OVERHEAD CONSOLE . . . . . . . . . . . . . . . . . . . . 6
READING/COURTESY LAMP ASSEMBLY . . . . . . 7
READING/COURTESY LAMP . . . . . . . . . . . . . . . 6
UNIVERSAL TRANSMITTER . . . . . . . . . . . . . . . . 7
SPECIAL TOOL . . . . . . . . . . . . . . . . . . . . . . . . . . 9
The Compass Mini-Trip Computer (CMTC) system
• Compass/Temperature
• Trip odometer (ODO)
• Average miles per gallon (ECO)
• Instant miles per gallon (ECO)
• Distance to empty (DTE)
• Elapsed time (ET)
• Off
The CMTC module in the overhead console has
When the ignition switch is first turned to the
• Blanks momentarily
• All segments of the VFD will light for one sec-
• Blanks momentarily
• Returns to the last mode setting selected before
8V - 1
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