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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 596 (DTCS 82 To B105A) >> Diagnosis And Testing >> B10A3-Left Blend Door Control Circuit Low (ATC) >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. 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 & THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO GROUND 
    Fig 1: Checking Left Blend Door Driver Circuit & Left Blend Door Common Driver Circuit For Short To Ground
    GC0028237Courtesy 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.

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

    Is the resistance below 10k ohms on either circuit? 

    Yes 

    1. Repair the circuit(s) with a resistance below 10k ohms for a short to ground.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  2).
  2. 2)  CHECK THE LEFT BLEND DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 2: Checking Left Blend Door Actuator Circuit
    GC0028238Courtesy 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: Checking Left Blend Door Actuator Circuit
    GC0028238Courtesy 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 .

    No 

    1. Replace the Left Blend Door Actuator in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. 4)  CHECK THE (C255) LEFT BLEND DOOR DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS 
    Fig 4: Checking Left Blend Door Driver Circuit For Short To Other Door Driver Circuits
    GC0028239Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (C255) Left Blend Door Driver circuit and the (C266) Front Mode Door Driver circuit, (C66) Front Mode Door Common Driver circuit, (C268) Recirculation Door Driver circuit, (C68) Recirculation Door Common Driver circuit, (C61) Right Blend Door Driver circuit, (C161) Right Blend Door Common Driver circuit, (C139) Rear Mode Door Driver circuit, and the (C939) Rear Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms between the (C255) Left Blend Door Driver circuit and any of the other door driver circuits? 

    Yes 

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

    No 

    1. Go To step  5).
  5. 5)  CHECK THE (C55) LEFT BLEND DOOR COMMON DRIVER CIRCUIT FOR A SHORT TO OTHER DOOR DRIVER CIRCUITS 
    Fig 5: Checking Left Blend Door Common Driver Circuit For Short To Other Door Driver Circuits
    GC0028240Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (C55) Left Blend Door Common Driver circuit and the (C266) Front Mode Door Driver circuit, (C66) Front Mode Door Common Driver circuit, (C268) Recirculation Door Driver circuit, (C68) Recirculation Door Common Driver circuit, (C61) Right Blend Door Driver circuit, (C161) Right Blend Door Common Driver circuit, (C139) Rear Mode Door Driver circuit, and the (C939) Rear Mode Door Common Driver circuit in the A/C Heater Control C2 harness connector.

    Is the resistance below 10k ohms between the (C55) Left Blend Door Common Driver circuit and any of the other door driver circuits? 

    Yes 

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

    No 

    1. Go To step  6).
  6. 6)  RUN THE ACTUATOR DTC DETECTION TEST 

    Reconnect the A/C Heater Control C2 harness connector.

    Reconnect the Left Blend Door Actuator harness connector.

    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 DTC Detection. When the test is complete, select View DTCs.

    Does the scan tool only display: B10A3-LEFT BLEND DOOR CONTROL CIRCUIT LOW? 

    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). If multiple DTCs are present, diagnose and repair all short high DTCs before diagnosing short low DTCs. Refer to the 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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