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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO GROUND 
    Fig 1: Checking Left Blend Door Driver (B) Circuit For Short To Ground
    GC0013823Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 harness connector.

    Measure the resistance of the (C255) Left Blend Door Driver circuit between ground and the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C255) Left Blend Door Driver circuit for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .

    No 

    1. Go To step  2).
  2. 2)  CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 2: Measuring Resistance Between Left Blend Door Common Driver & Left Blend Door Driver Circuits
    GC0013826Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 30.0 ohms? 

    Yes 

    1. Go To step  3).

    No 

    1. Go To step  4).
  3. 3)  CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT 
    Fig 3: Measuring Resistance Between Left Blend Door Common Driver & Left Blend Door Driver Circuits
    GC0013826Courtesy of DAIMLERCHRYSLER CORP.

    Disconnect the Left Blend Door Actuator harness connector.

    Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C55) Left Blend Door Common Driver Circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C255) Left Blend Door Driver circuit for a short to the (C55) Left Blend Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .

    No 

    1. Replace the Left Blend Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
  4. 4)  VERIFY THAT THE FAULT IS STILL PRESENT 

    Reconnect the A/C Heater Control C2 harness connector.

    Turn the ignition on.

    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.

    Turn the ignition off, wait 10 seconds, and turn the ignition on.

    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.

    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.

    Read DTCs from the A/C status indictor.

    Does the A/C status indicator display DTC 67? 

    Yes 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .

    No 

    1. Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short that set the original fault. Repair as necessary. Then, if present, diagnose and repair all other DTCs. Refer to the DIAGNOSTIC CODE INDEX  for a complete list of HVAC related symptoms.
    2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
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