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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 ((HVAC Systems - Electrical Diagnostics)) >> HVAC - Electrical Diagnostics >> DTC Troubleshooting >> B1611-Ambient Light Sensor Input Circuit High (ATC) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT VOLTAGE 
    Fig 1: Measuring Voltage Of Auto Headlamps Signal Circuit
    GC0013910Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Sun Sensor harness connector.

    Turn the ignition on.

    Measure the voltage of the (L24) Auto Headlamps Signal circuit.

    What voltage is present? 

    Above 5.2 Volts 

    1. Go To  2.

    4.8 Volts to 5.2 Volts 

    1. Go To  3.

    Below 4.8 Volts 

    1. Go To  5.
  2. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Measuring Voltage Of Auto Headlamps Signal Circuit
    GC0013910Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C1 harness connector.

    Turn the ignition on.

    Measure the voltage of the (L24) Auto Headlamps Signal circuit.

    Is the voltage above 0.2 volts? 

    Yes 

    1. Repair the (L24) Auto Headlamps Signal circuit for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. CHECK (G939) SUN SENSOR RETURN CIRCUIT FUNCTION 
    Fig 3: Checking Sun Sensor Return Circuit Function
    GC0013911Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Connect a jumper wire between the (L24) Auto Headlamps Signal circuit and the (G939) Sun Sensor Return circuit in the Sun Sensor harness connector.

    Turn the ignition on.

    With the scan tool in HVAC, select Data Display and read the Ambient Light Sensor voltage.

    Is the voltage below 0.2 volts? 

    Yes 

    1. Replace the Sun Sensor in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  4.
  4. CHECK (G939) SUN SENSOR RETURN CIRCUIT FOR AN OPEN 
    Fig 4: Checking Sun Sensor Return Circuit For Open
    GC0013899Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C1 harness connector.

    Measure the resistance of the (G939) Sun Sensor Return circuit between the Sun Sensor harness connector and the A/C Heater Control C1 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (G939) Sun Sensor Return circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  5. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN 
    Fig 5: Checking Auto Headlamps Signal Circuit For Open
    GC0013912Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C1 harness connector.

    Measure the resistance of the (L24) Auto Headlamps Signal circuit between the Sun Sensor harness connector and the A/C Heater Control C1 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (L24) Auto Headlamps Signal circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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