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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 >> B10A5-Left Blend Door Control Circuit Open (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 FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE DTCs 

    Turn the ignition on.

    With the scan tool, read active HVAC DTCs.

    Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE DTCs? 

    Yes 

    1. Diagnose and repair the DTC(s). Refer to DIAGNOSTIC CODE INDEX  for a complete list of all HVAC related symptoms.

    No 

    1. Go To  2.
  2. CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 1: Measuring Resistance Between Left Blend Door Driver & Left Blend Door Common Driver Circuits
    GC0013847Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 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 above 70.0 ohms? 

    Yes 

    1. Go To  3.

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR AN OPEN 
    Fig 2: Checking Left Blend Door Driver (B) Circuit For Open
    GC0013849Courtesy of CHRYSLER LLC

    Disconnect the Left Blend Door Actuator harness connector.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  4.

    No 

    1. Repair the (C255) Left Blend Door Driver circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR AN OPEN 
    Fig 3: Check Left Blend Door Driver (A) Circuit For Open
    GC0013848Courtesy of CHRYSLER LLC

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the Left Blend Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Repair the (C55) Left Blend Door Common Driver circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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