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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> (Heating & Air Conditioning - Electrical Diagnostics) >> DTC Troubleshooting >> B160F-12-Twilight/Ambient Light Sensor Input - Circuit Short To Battery >> Diagnostic Test

Diagnostic Test

  1. CHECK IF THE DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. With the scan tool, read HVAC DTCs.

      Is this DTC active?

      Yes 

      • Go To  2

      No 

      • Go To  6
  2. CHECK THE (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Auto Headlamps Signal Circuit For A Short To Voltage
    GC0149262Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the A/C Heater Control C1 harness connector.
    3. Ignition on, engine not running.
    4. Measure the voltage of the (L24) Auto Headlamps Signal circuit.

      Is there any voltage present?

      Yes 

      • Repair the (L24) Auto Headlamps Signal circuit for a short to voltage.
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Go To  3
  3. CHECK THE (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN 
    Fig 2: Checking Auto Headlamps Signal Circuit For An Open
    GC0149263Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Sun Sensor harness connector.
    3. Measure the resistance of the (L24) Auto Headlamps Signal circuit between the A/C Heater Control C1 harness connector and the Sun Sensor harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4

      No 

      • Repair the (L24) Auto Headlamps Signal circuit for an open.
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  4. CHECK THE (C121) SENSOR GROUND CIRCUIT FOR AN OPEN 
    Fig 3: Checking Sensor Ground Circuit For An Open
    GC0149254Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control C1 harness connector and the Sun Sensor harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (C121) Sensor Ground circuit for an open.
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. CHECK THE SUN SENSOR AND A/C HEATER CONTROL 
    1. Replace the Sun Sensor in accordance with the Service Information.
    2. Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      Did this DTC reset while performing the HVAC Verification Test?

      Yes 

      • Replace and program the A/C Heater Control in accordance with the Service Information.
      • Perform the HVAC VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Test complete.
  6. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.
    3. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
    4. Wiggle the wiring and connectors while checking for shorted and open circuits.

      Were there any problems found?

      Yes 

      No 

      • Test complete.
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