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Repairing CMTC Displays Double Dash (- -) In Temperature Display

  1. Connect scan tool to Data Link Connector (DLC), under lower left side of instrument panel. Turn ignition on. Select SYSTEM MONITORS, then J1850 MODULE SCAN. If scan tool displays HVAC on the BUS, to next step. If scan tool does not display HVAC on the BUS, perform appropriate test under COMMUNICATIONS. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table under SELF-DIAGNOSTIC SYSTEM.
  2. Using scan tool, select BODY, COMPASS MINI-TRIP, SYSTEM TESTS, then AUTO SELF TEST. If scan tool displays TEST FAILED: BUS MESSAGE FAILURE, perform appropriate test under COMMUNICATIONS. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table under SELF-DIAGNOSTIC SYSTEM. If scan tool displays TEST FAILED: INTERNAL EVIC FAILURE, replace and program CMTC. See COMPASS/MINI-TRIP COMPUTER  under REMOVAL & INSTALLATION. If scan tool does not display TEST FAILED: BUS MESSAGE FAILURE or TEST FAILED: INTERNAL EVIC FAILURE, go to next step.
  3. Turn ignition off. Locate ambient temperature sensor electrical connector. Ambient temperature sensor is located on radiator support, behind right center of front grille. Disconnect ambient temperature sensor Black 2-pin electrical connector. Measure resistance between ambient temperature sensor terminals and compare results with specifications found in AMBIENT TEMPERATURE SENSOR RESISTANCE  table. If resistance is not as specified, replace ambient temperature sensor. See AMBIENT TEMPERATURE SENSOR  under REMOVAL & INSTALLATION. If resistance is as specified, go to next step.
  4. On Durango, disconnect Black 12-pin HVAC controller connector C2. On all models, disconnect Black 16-pin HVAC controller connector C1. Using DVOM, measure resistance between ambient temperature sensor connector terminals No. 1 (Violet/Light Green wire) and No. 2 (Black/Light Blue wire). If resistance is less than 5 ohms, repair ambient temperature sensor signal circuit (Violet/Light Green wire) and ground circuit (Black/Light Blue wire) for being shorted together. If resistance is 5 ohms or more, go to next step.
  5. Using DVOM, measure resistance between ground and ambient temperature sensor connector terminal No. 1 (Violet/Light Green wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Violet/Light Green wire between HVAC controller and ambient temperature sensor connector terminal No. 1.
  6. Using DVOM, measure resistance of Violet/Light Green wire between Black 16-pin HVAC controller connector C1 terminal No. 13 (Dakota) or terminal No. 4 (Durango) and ambient temperature sensor connector terminal No. 1. If resistance is 5 ohms or more, repair open in Violet/Light Green wire between HVAC controller and ambient temperature sensor connector terminal No. 1. If resistance is less than 5 ohms, go to next step.
  7. Using DVOM, measure resistance of Black/Light Blue wire between ambient temperature sensor connector terminal No. 2 and Black 16-pin HVAC controller connector C1 terminal No. 5 (Dakota) or Black 12-pin HVAC controller connector C2 terminal No. 4. If resistance is 5 ohms or more, repair open in Black/Light Blue wire between HVAC controller and ambient temperature sensor connector terminal No. 2. If resistance is less than 5 ohms, replace HVAC controller. See HEATING VENTILATION AIR CONDITIONING CONTROLLER  under REMOVAL & INSTALLATION.
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