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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> (HVAC Systems (MTC) - Electrical Diagnostics) >> DTC Troubleshooting >> DTC 63: Front Mode Door Driver Circuit Shorted To Ground >> Diagnostic Test

Diagnostic Test

  1. CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND 
    Fig 1: Checking Mode Door Driver Circuit For A Short To Ground
    GC0096405Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the A/C Heater Control C2 harness connector.
    3. Measure the resistance of the (C266) Mode Door Driver circuit between ground and the A/C Heater Control C2 harness connector.

      Is the resistance below 10k ohms?

      Yes 

      No 

      • Go To step  2
  2. CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 2: Checking Mode Door Actuator Circuit Resistance
    GC0096392Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.

      Is the resistance below 30.0 ohms?

      Yes 

      • Go To step  3

      No 

      • Go to step  4
  3. CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT 
    Fig 3: Checking Mode Door Actuator Circuit Resistance
    GC0096392Courtesy of CHRYSLER LLC
    1. Disconnect the Mode Door Actuator harness connector.
    2. Measure the resistance between the (C266) Mode Door Driver circuit and the (C66) Mode Door Common Driver Circuit in the A/C Heater Control C2 harness connector.

      Is the resistance below 10k ohms?

      Yes 

      No 

  4. VERIFY THAT THE FAULT IS STILL PRESENT 
    1. Reconnect the A/C Heater Control C2 harness connector.
    2. Turn the ignition on.
    3. Actuate the Clear DTC function by performing the following:
      • Turn the blower control on.
      • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
      • When the A/C status indicator begins displaying DTCs, set the Mode switch to the floor position, simultaneously press the A/C mode switch and the EBL mode switch down until both LEDs start flashing (approximately 5 seconds) and then release the mode switches. Stored DTCs will clear from memory in approximately two seconds.
    4. Turn the ignition off, wait 10 seconds, and turn the ignition on.
    5. Actuate the Actuator Circuit Test / Door Calibration Function by performing the following:
      • Turn the blower control off.
      • Press and hold the EBL mode switch down and then turn the blower control on. Continue to hold the EBL mode switch down until the EBL status indicator begins flashing. Then, release the EBL mode switch. While the test / function is running, the EBL status indicator will flash once per second. If the test / function passes, the EBL status indicator will stop flashing. If the test / function fails, the A/C and EBL status indicators will flash alternately. Allow the test / function to run to completion before proceeding.
    6. Actuate the Display DTC function by performing the following:
      • Turn the blower control on.
      • Press the A/C mode switch down, turn the blower control to off, wait until both LEDs illuminate (approximately 5 seconds) and then release the A/C mode switch.
      NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and stored DTCs when the EBL status indicator is illuminated.
    7. Read DTCs from the A/C status indictor.

      Does the A/C status indicator display DTC 63?

      Yes 

      No 

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