Compass: Description and Operation

SYSTEM OPERATION
Compass/Temperature Mini - Trip Computer (CMTC)

Compass/Temperature Mini-Trip Computer:

CTMC Module:

The Compass/Temperature Mini-Trip Computer (CMTC) system is located on the right hand side of the instrument panel cluster. The CMTC is an electronic control module with a vacuum fluorescent display and two function buttons. The CMTC is capable of displaying compass, temperature, and trip computer information. Actuation of the STEP button will cause the CMTC to change mode of operation and actuation of the US/M button will toggle between English and Metric unit of measurement. A reset of the trip computer information is accomplished by actuating the Step and US/M buttons simultaneously.

The CMTC is active only when the ignition switch is in the ON position. When the ignition switch is turned ON, the CMTC will turn on all of the segments in the display for one second then return to the last function screen that was displayed prior to the ignition being turned OFF. The functions that are available via activation of the STEP switch are as follow:
- Compass and Ambient Temperature
- Average Trip Fuel Economy (AVG ECO)
- Estimated Range (RANGE)
- Present Fuel Economy (ECO)
- Trip Odometer (ODO)
- Elapsed Ignition On Time (ET)
- Blank Screen

Compass
The CMTC is an auto-calibrating compass and requires no activation of any switches to trigger a forced calibration. The compass is initially setup to be calibrated for earth fields of approximately 180 milligauss. However, due to the variation in the magnetic earth field across the country and the variation of the magnetic structure from vehicle to vehicle the compass may need to be calibrated. Refer to Compass Calibration Service Procedures.