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Incorrect Ambient Temperature Readings (Generally Plus Or Minus 5 Degrees)

NOTE: Ambient temperature display is updated based on time and vehicle speed. At higher speeds, ambient temperature display will be updated more often than at lower speeds.
  1. Ensure CMTC is communicating on PCI BUS and no PCM or HVAC DTCs exist. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If CMTC is communicating on PCI BUS and no PCM or HVAC DTCs exist, go to next step.
  2. 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.
    AMBIENT TEMPERATURE SENSOR RESISTANCE

    Ambient Temperature - °F (°C) Ohms
    32 (0) 29,300-36,000
    50 (10) 18,000-22,000
    68 (20) 11,400-13,600
    77 (25) 9100-10,800
    86 (30) 7400-8700
    104 (40) 4900-5700
    122 (50) 3300-3800
  3. Close all vehicle doors and ensure all lights are off. Using DVOM, measure resistance between ground and ambient temperature sensor connector terminal No. 2 (Black/Light Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire between ambient temperature sensor connector terminal No. 2 and Black 12-pin HVAC controller connector C2 terminal No. 4.
  4. Disconnect Black 16-pin HVAC controller connector C1. See Figure . Using DVOM, measure resistance between ground and Violet/Light Green wire at Black 16-pin HVAC controller connector C1 terminal No. 13 (Dakota) or terminal No. 4 (Durango). 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 ambient temperature sensor connector terminal No. 1 and Black 16-pin HVAC controller connector C1.
  5. Using DVOM, measure resistance of Violet/Light Green wire between ambient temperature sensor connector terminal No. 1 and Black 16-pin HVAC controller connector C1 terminal No. 13 (Dakota) or terminal No. 4 (Durango). If resistance is 5 ohms or more, repair open in Violet/Light Green wire between Black 16-pin HVAC controller connector C1 and ambient temperature sensor connector terminal No. 1. If resistance is less than 5 ohms, replace and program CMTC. See COMPASS/MINI-TRIP COMPUTER  under REMOVAL & INSTALLATION.
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