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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 46: Front Mode Door Bound >> Diagnostic Test

Diagnostic Test

  1. VERIFY IF ANY ACTUATOR CIRCUIT TEST FAULTS OR OVERCURRENT FAULTS ARE PRESENT 
    1. Turn the ignition on.
    2. 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.
    3. Turn the ignition off, wait 10 seconds, and turn the ignition on.
    4. 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.
    5. 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.
    6. Read DTCs from the A/C status indictor.

      Does the A/C status indicator display any of the following DTCs: 41, 43, 44, 61, 62, 63, 64, 67, 68, 69, 71, or 72?

      Yes 

      • As present, diagnose and repair the faults in the following order: DTC 72 first, then DTC 62, then DTC 61, then DTCs 64, 68, or 71, then DTCs 63, 67, or 69, and finally DTCs 41, 43, or 44.

      No 

      • Go to step  2
  2. CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 1: Checking Mode Door Actuator Circuit Resistance
    GC0096392Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the A/C Heater Control C2 harness connector.
    3. 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 above 70.0 Ohms?

      Yes 

      • Go to step  3

      No 

      • Go to step  5
  3. CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR AN OPEN 
    Fig 2: Checking Mode Door Driver Circuit For An Open
    GC0096397Courtesy of CHRYSLER LLC
    1. Disconnect the Mode Door Actuator harness connector.
    2. Measure the resistance of the (C266) Mode Door Driver circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  4

      No 

  4. CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR AN OPEN 
    Fig 3: Checking Mode Door Common Driver Circuit For An Open
    GC0096398Courtesy of CHRYSLER LLC
    1. Measure the resistance of the (C66) Mode Door Common Driver Circuit between the A/C Heater Control C2 harness connector and the Mode Door Actuator harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

  5. INSPECT ACTUATOR AND HOUSING ASSEMBLY FOR A CONDITION CAUSING THE MODE DOOR TO SEIZE 
    1. Turn the ignition off.
    2. Inspect the actuator, linkage, and housing assembly for a condition causing the mode door to seize.

      Are there any physical or mechanical problems with the door, housing, linkage, or actuator?

      Yes 

      No 

      • Go to step  6
  6. CHECK MODE DOOR TRAVEL 
    1. Remove the Mode Door Actuator from the A/C Heater Housing Assembly.
    2. By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over the entire span of travel (approximately 240 degrees).

      Does the door operate smoothly in both directions over the entire span of travel?

      Yes 

      • Replace the Mode Door Actuator in accordance with the Service Information. Then, Go To  7.

      No 

  7. VERIFY IF THE FAULT IS STILL PRESENT 
    1. Turn the ignition on.
    2. 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.
    3. Turn the ignition off, wait 10 seconds, and turn the ignition on.
    4. 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.
    5. 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.
    6. Read DTCs from the A/C status indictor.

      Does the A/C status indicator display DTC 46?

      Yes 

      No 

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