Compass Mini Trip Computer (CMTC)

The Compass Mini Trip Computer (CMTC) is located in overhead console or Overhead Travel Information System (OTIS). This dual-function display provides a digital readout of ambient (outside) temperature and 8 primary compass readings to indicate direction in which vehicle is facing. CMTC is self-calibrated and requires no adjustment. The word CAL will be displayed to indicate that compass is in fast calibrating mode. The CAL display will be turned off after vehicle has completed 3 continuous circles without stopping, in an area free of magnetic disturbance, and calibration of compass is complete. If module displays ambient temperature while compass display is blank, vehicle must be demagnetized. If compass display still goes blank after vehicle is demagnetized, Compass Mini Trip Computer (CMTC) module must be replaced.

The Overhead Travel Information System (OTIS) provides vehicle operator with supplementary information on a Vacuum Fluorescent Display (VFD) in the overhead console (if equipped), and is controlled by the Compass Mini Trip Computer (CMTC). Vehicle operator selects and resets display functions through use of US/M, STEP, C/T and RESET buttons. OTIS obtains most of its information from the network through CCD bus.

OTIS powers up when it senses vehicle (battery) voltage through ignition input circuit. When OTIS is powered-up, the VFD display is blank, then becomes illuminated by segments of VFD. During this time, OTIS sends and receives information from CCD bus to determine what to display after initialization. OTIS will display dashes (- -) for any screens for which it did not receive CCD bus messages during initialization. Dashes will be replaced by valid information if and when it is received.