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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 181 ((Heating & Air Conditioning (MTC) - Electrical Diagnostics - 1500, 2500 & 3500)) >> DTC Troubleshooting >> B160F-12-Twilight/Ambient Light Sensor Input - Circuit Short To Battery >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK IF THE DTC IS ACTIVE 
    1. Ignition on, engine not running.
    2. With the scan tool, read HVAC DTC's.
      NOTE:

      It can take up to 60 seconds or more for this DTC to mature.

      Is this DTC active?

      Yes 

      • Go To  2.

      No 

      • Go To  6.
  2. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Auto Headlamps Signal Circuit For A Short To Voltage
    GC0089898Courtesy 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 HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .

      No 

      • Go To  3.
  3. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN 
    Fig 2: Checking Auto Headlamps Signal Circuit For An Open
    GC0089899Courtesy 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 HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  4. CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN 
    Fig 3: Checking Sensor Ground Circuit For An Open
    GC0089900Courtesy 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 HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .
  5. CHECK THE SUN SENSOR AND A/C HEATER CONTROL 
    1. Replace the Sun Sensor in accordance with the Service Information.
    2. Perform HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .

      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 HVAC VERIFICATION TEST. Refer to HVAC VERIFICATION TEST .

      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 schematics as a guide, inspect the wiring and connectors specific to this circuit.
    3. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, partially broken wires.
    4. Check the connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
    5. Wiggle the wiring and connectors while checking for shorted and open circuits.
    6. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.

      Were there any problems found?

      Yes 

      No 

      • Test complete.
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