Compass Mini-Trip Computer (CMTC)

SYSTEM OPERATION
A mini trip computer is available on this model to provide several electronic functions and features. The trip computer contains a central processing unit and interfaces with other modules in the vehicle on the Chrysler Collision Detection (CCD) data bus network.

The CCD data bus network 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 capabilities.

Some of the functions and features that the trip computer supports and/or controls, include the following display options:
- Compass and temperature
- Trip odometer (ODO)
- Average fuel economy (AVG ECO)
- Instant fuel economy (ECO)
- Distance to empty (DTE)
- Elapsed time (ET)
- Blank display

Momentarily depressing and releasing the Step button when the ignition switch is in the On position will cause the overhead console display to step sequentially through the listed display options. Momentarily depressing and releasing the U.S./Metric button toggles the display between U.S. and Metric measurements. For more information on the trip computer features and functions, refer to the owner 5 manual in the vehicle glove box.

The push button (Step and U.S./Metric) switches and the compass flux-gate unit are integral to the trip computer, compass, and thermometer display module unit. The ambient temperature sensor is hard-wired to the module. Data input for all other trip computer functions is received through CCD data bus messages. The trip computer uses its internal programming and all of these inputs to calculate and display the requested data. If the data displayed is incorrect, perform the self-diagnostic tests as described. If these tests prove inconclusive, the use of a DRB scan tool and the proper Diagnostic Procedures are recommended for further testing of the trip computer and the CCD data bus.

The trip computer, compass, and thermometer display module cannot be repaired, and are only available for service as a unit. If faulty or damaged, the complete module must be replaced.

COMPASS MINI-TRIP COMPUTER (CMTC)

This system, located in the overhead console, displays information on outside temperature, compass direction and trip information.

Compass And Temperature Display
This display provides the outside temperature and one of eight compass readings to indicate the direction the vehicle is facing.

Trip Odometer (ODO)
Shows the distance travelled since the last reset.

Average Fuel Economy (AVE ECO)
Shows the average fuel economy in MPG (miles per gallon) or L/100Km since the last reset.

Instantaneous Fuel Economy
Shows the fuel economy for the last few seconds in MPG or L/100Km.

Distance to Empty (DTE)
Shows the estimated distance that can be travelled with the fuel remaining in the tank. This is calibrated using the MPG for the last few minutes.

Elapsed Time (ET)
Shows the accumulated ignition on time since the last reset.

Step Button
Press this button to cycle through all the mini-trip computer displays.

US/M Button
Press this button to convert all vehicle displays from US to metric to US.

To Reset the Display
Press the Step and US/M buttons simultaneously for at least two seconds and all resettable conditions will be rest. This will occur only if a resettable function (AVG ECO, ECO, ET) is currently being displayed.

Automatic Compass Calibration
This compass is self-calibrating which eliminates the need to manually set the compass. When the vehicle is new, the compass may appear erratic and the CAL symbol will be displayed. After completing three 360° turns in an area free from large metal or metallic objects, the CAL symbol will turn off and the compass will function normally.

Compass Variance
Compass Variance is the difference between Magnetic North and Geographic North. In some areas of the country, the difference between Magnetic and Geographic North is great enough to cause the compass to give false readings. If this occurs, the compass variance must be set.

Enhanced Accident Response (Highline CTM only)
If the Airbag Control Module (ACM) deploys the airbags, a message is transmitted over the CCD bus to the CTM module to unlock the doors. The interior lights will be turned on when the vehicle speed message on the CCD bus indicates 0 mph or the message is not present. In addition to unlocking the doors, the door lock feature will be disabled for a predetermined amount of time following the deployment. Once the ignition key has been cycled to the "off" position, normal operation will resume.