CMTC Test 1A - Identifying Compass/Mini-Trip Problems

NOTE: Perform SYMPTOM ID TEST 1A before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagrams, refer to WIRING DIAGRAMS . Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE .

NOTE: For CMTC wiring diagram, see INSTRUMENT PANEL - ANALOG article for Dakota or see INSTRUMENT PANEL - ANALOG article for Durango.

Using scan tool, select COMPASS/MINI-TRIP. If scan tool displays NO RESPONSE, or Compass/Mini-Trip Computer (CMTC) shows NO DISPLAY (except for direction or temperature), go to TEST 5A .
Select AUTO SELF TEST. If any display segments fail to illuminate, replace CMTC module. If CMTC displays FAILED, replace CMTC module.

Diagnosis of CMTC system is separated into 10 faults. Identify fault(s) listed in CMTC SYSTEM DIAGNOSTIC TEST DIRECTORY table and perform indicated test(s).

CMTC SYSTEM DIAGNOSTIC TEST DIRECTORY

Problem

Perform

Outside Temperature

CMTC Displays SC

CMTC TEST 2A

CMTC Displays OC

CMTC TEST 3A

Incorrect Reading More Than 5 Percent Variation)

⁽¹⁾

Average MPG Or Fuel Economy ⁽²⁾

Replace CMTC Module

⁽¹⁾	Replace Ambient Temperature Sensor.

⁽²⁾	Average MPG or fuel economy is inoperative or wrong. MPG calculations are only accurate to within 10 percent.

If distance to empty is inoperative or wrong, replace CMTC module. If trip odometer is inoperative or wrong, replace CMTC module. If elapsed time is inoperative or wrong, replace CMTC module.
If CMTC fails to respond to instrument cluster dimming, replace CMTC module. If CMTC switch is inoperative, replace CMTC module. If compass is inoperative or wrong, locate open area away from large metal objects. Turn ignition on. Press and hold compass/temperature button until CAL is displayed. Driving slowly, perform 3 complete circles. CAL light will turn off and compass will be calibrated. If compass goes blank, replace CMTC module.