Diagnosis And Testing - Compass Mini-Trip Computer: Notes

The following diagnostic procedure can be used if the compass mini-trip computer is not operational in any way. If the problem is specific to a individual CMTC display, go to the appropriate display title noted below and diagnose using the information provided on how these displays are generated.

1. Remove the overhead console from the headliner.
2. Using a ohmmeter, check the ground circuit cavity of the compass mini-trip computer electrical connector for proper continuity to ground. Continuity should be present, If OK go to Step 3, If not OK repair the open or shorted ground circuit as required.
   NOTE: Connect the negative battery cable before proceeding.
3. Using a voltmeter, check the fused (B+) circuit cavity of the compass mini-trip computer electrical connector for 12V. Voltage should be present, If OK go to Step 4, If not OK repair the open or shorted fused (B+) circuit as required.
4. Using a voltmeter, check the fused ignition switch output circuit cavity of the compass mini-trip computer electrical connector for 12V with Key ON. Voltage should be present, If OK, replace the inoperative CMTC module, If not OK repair the open or shorted fused ignition switch output circuit as required.