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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 >> B10A2-Left Blend Door Control Circuit/Performance (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 THE DOOR DRIVER CIRCUITS FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Door Driver Circuits For A Short To Voltage
    GC0039724Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 harness connector.

    Turn the ignition on.

    Measure the voltage of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

    Is the voltage above 0.2 volts on any of the circuits? 

    Yes 

    1. Repair all circuits with voltage above 0.2 volts for a short to voltage.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  2.
  2. CHECK THE DOOR DRIVER CIRCUITS FOR A SHORT TO GROUND 
    Fig 2: Checking Door Driver Circuits For A Short To Ground
    GC0039725Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance of the (C266) Mode Door Driver circuit, the (C66) Mode Door Common Driver circuit, the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit between ground and the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  3.
  3. CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 3: Checking Mode Door Driver (B) Circuit For Short To Other Door Driver Circuit(s)
    GC0013875Courtesy of CHRYSLER LLC

    Measure the resistance between the (C266) Mode Door Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to the (C266) Mode Door Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  4.
  4. CHECK THE (C66) MODE DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT, THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 4: Checking Mode Door Driver (A) Circuit For Short To Other Door Driver Circuit(s)
    GC0013874Courtesy of CHRYSLER LLC

    Measure the resistance between the (C66) Mode Door Common Driver circuit and the (C255) Left Blend Door Driver circuit, the (C55) Left Blend Door Common Driver circuit, the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to the (C66) Mode Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  5.
  5. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 5: Checking Left Blend Door Driver Circuit For Short To Right Blend Door, Right Blend Door Common, Recirculation Door & Recirculation Door Common Driver Circuits
    GC0039726Courtesy of CHRYSLER LLC

    Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to (C255) Left Blend Door Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  6.
  6. CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT, THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT, THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT, & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 6: Checking Left Blend Door Common Driver Circuit For A Short To Right Blend Door, Right Blend Door Common, Recirculation Door & Recirculation Door Common Driver Circuits
    GC0039727Courtesy of CHRYSLER LLC

    Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C252) Right Blend Door Driver circuit, the (C52) Right Blend Door Common Driver circuit, the (C268) Recirculation Door Driver circuit, and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to (C55) Left Blend Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  7.
  7. CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 7: Measuring Resistance Between Right Blend Door Driver Circuit & Recirculation Door Driver & Recirculation Door Common Driver Circuits
    GC0039728Courtesy of CHRYSLER LLC

    Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to the (C252) Right Blend Door Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  8.
  8. CHECK THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT & THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 8: Measuring Resistance Between Right Blend Door Common Driver Circuit & Recirculation Door Driver & Recirculation Door Common Driver Circuits
    GC0039729Courtesy of CHRYSLER LLC

    Measure the resistance between the (C52) Right Blend Door Common Driver circuit and the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit.

    Is the resistance below 10k ohms on any of the circuits? 

    Yes 

    1. Repair all circuits with a resistance below 10k ohms for a short to the (C52) Right Blend Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To  9.
  9. CHECK THE MODE DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 9: Checking Mode Door Driver Circuit For A Short To Mode Door Common Driver Circuit
    GC0013876Courtesy of CHRYSLER LLC

    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 

    1. Go To  10.

    No 

    1. Go To  11.
  10. CHECK THE (C266) MODE DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C66) MODE DOOR COMMON DRIVER CIRCUIT 
    Fig 10: Checking Mode Door Driver Circuit For A Short To Mode Door Common Driver Circuit
    GC0013876Courtesy of CHRYSLER LLC

    Disconnect the Mode Door Actuator harness connector.

    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 

    1. Repair the (C266) Mode Door Driver circuit for a short to the (C66) Mode Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Mode Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  11. CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 11: Measuring Resistance Between Left Blend Door Driver & Left Blend Door Common Driver Circuits
    GC0013847Courtesy of CHRYSLER LLC

    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  12.

    No 

    1. Go To  13.
  12. CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT 
    Fig 12: Measuring Resistance Between Left Blend Door Driver & Left Blend Door Common Driver Circuits
    GC0013847Courtesy of CHRYSLER LLC

    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 .

    No 

    1. Replace the Left Blend Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  13. CHECK THE RIGHT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 13: Checking Right Blend Door Driver Circuit For A Short To Right Blend Door Common Driver Circuit
    GC0013856Courtesy of CHRYSLER LLC

    Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right 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  14.

    No 

    1. Go To  15.
  14. CHECK THE (C252) RIGHT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C52) RIGHT BLEND DOOR COMMON DRIVER CIRCUIT 
    Fig 14: Checking Right Blend Door Driver Circuit For A Short To Right Blend Door Common Driver Circuit
    GC0013856Courtesy of CHRYSLER LLC

    Disconnect the Right Blend Door Actuator harness connector.

    Measure the resistance between the (C252) Right Blend Door Driver circuit and the (C52) Right Blend Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C252) Right Blend Door Driver circuit for a short to the (C52) Right Blend Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Right Blend Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  15. CHECK THE RECIRCULATION DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 15: Measuring Resistance Between Recirculation Door Driver & Recirculation Door Common Driver Circuits
    GC0013885Courtesy of CHRYSLER LLC

    Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 30.0 ohms? 

    Yes 

    1. Go To  16.

    No 

    1. Go To  17.
  16. CHECK THE (C268) RECIRCULATION DOOR DRIVER CIRCUIT FOR A SHORT TO THE (C68) RECIRCULATION DOOR COMMON DRIVER CIRCUIT 
    Fig 16: Measuring Resistance Between Recirculation Door Driver & Recirculation Door Common Driver Circuits
    GC0013885Courtesy of CHRYSLER LLC

    Disconnect the Recirculation Door Actuator harness connector.

    Measure the resistance between the (C268) Recirculation Door Driver circuit and the (C68) Recirculation Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms? 

    Yes 

    1. Repair the (C268) Recirculation Door Driver circuit for a short to the (C68) Recirculation Door Common Driver circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Recirculation Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  17. RUN THE ACTUATOR CALIBRATION TEST 

    Reconnect the A/C Heater Control C2 harness connector.

    Reconnect the all of the Door Actuator harness connectors.

    Turn the ignition on.

    With the scan tool, erase HVAC DTCs.

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

    With the scan tool, select System Tests and then select Actuator Calibration Test. When the test is complete, select View DTCs.

    Does the scan tool only display: B10A2-LEFT BLEND DOOR CONTROL CIRCUIT/PERFORMANCE? 

    Yes 

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

    No, Other DTC(s) Displayed 

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

    No, And No Other DTCs Displayed 

    1. Using the wiring diagram as a guide, inspect the wiring and connectors for conditions causing an intermittent short. Repair as necessary.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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