RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
vehicle is equipped with and then attempt to get a response from the modules with the DRB III. If any modules are responding, the failure is not related
to the total bus, but can be caused by one or more modules PCI circuit or power supply and ground circuits. The DRB III may display "BUS (+/-)
SIGNAL OPEN" or "NO RESPONSE" to indicate a communication problem. These same messages will be displayed if the vehicle is not equipped with
that particular module. The CCD error message is a default message used by the DRB III and in no way indicates whether or not the PCI bus is
operational. The message is only an indication that a module is either not responding or the vehicle is not equipped.
Self-Check Diagnostics
SELF-CHECK DIAGNOSTICS
The CMTC/EVIC is capable of performing a diagnostic self check on its internal functions.
CMTC/EVIC diagnostics may be performed using a DRB III or by using the following procedure:
1. With the ignition switch in the OFF position, depress and hold the RESET and the C/T buttons.
2. Turn the ignition switch to the ON position.
3. Continue to hold both buttons until the software versions are displayed, then release the buttons.
4. All of the VFD segments will illuminate for 2-4 seconds. Check for segments that do not illuminate or illuminate all the time.
5. When the self-check is complete the CMTC/EVIC will display one of the following messages:
PASS SELF TEST
FAILED SELF TEST
NOT RECEIVING J1850 MESSAGE
6. To exit the self-check mode, depress the RESET button or cycle the ignition switch and the CMTC/EVIC will return to normal operation.
If a Communication fault is displayed, refer to the symptom list. If a FAILED SELF TEST is displayed, the CMTC/EVIC must be replaced.
Vehicle Information Display
COMPASS/MINI-TRIP COMPUTER (CMTC) OR ELECTRONIC VEHICLE INFORMATION CENTER (EVIC)
When equipped, the Compass/Mini Trip Computer (CMTC) or Electronic Vehicle Information Center (EVIC) is located in the overhead console. The
CMTC or EVIC supplements the standard vehicle instrumentation. The CMTC and the EVIC use a vacuum fluorescent (VF) display to supply the
vehicle operator with a compass heading, outdoor temperature, average fuel economy, distance to empty, instantaneous fuel economy, trip odometer,
elapsed ignition ON time, distance to service, warning messages, and service messages. The EVIC also provides an interface to enable and disable
vehicle programmable features and display memory system messages. If equipped, the CMTC or the EVIC is also available with an integrated Universal
Garage Door Opener (UGDO) known as HomeLink.
The CMTC and EVIC function buttons are labeled C/T, RESET, STEP and MENU. The three UGDO buttons are labeled with dots to indicate the
channel number.
Most of the CMTC or EVIC display information is received over the PCI bus. The CMTC or EVIC sends and receives data over the PCI bus,
communicating with the FCM, PCM, and the Instrument Cluster.
VEHICLE INFORMATION DISPLAY
The CMTC/EVIC provides the following functions:
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Compass direction
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Outside temperature
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Elapsed ignition ON time
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Distance to empty
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Average fuel economy
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Instantaneous fuel economy
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Trip odometer
-
Distance to service
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Driver alert messages:
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TURN SIGNAL ON (with vehicle graphic)
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PERFORM SERVICE
-
DOOR OPEN (individual or multiple doors, with graphic)
An audible chime or chimes will accompany any displayed warning messages. Chime requests with an OPEN message are dependent upon vehicle
speed.
The CMTC or EVIC will not display information for any of the screens for which it did not receive the proper PCI bus data. Refer to the symptom list in
the Overhead Console section for problems related to the CMTC/EVIC.
The CMTC/EVIC receives the following messages from the Instrument Cluster:
