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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 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 the DIAGNOSTIC CODE INDEX for a complete list of all HVAC related symptoms.

    No 

    1. Go To step  2).
  2. 2)  CHECK THE REAR MODE DOOR ACTUATOR CIRCUIT RESISTANCE 
    Fig 1: Checking Rear Mode Door Actuator Circuit
    GC0028255Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the A/C Heater Control C2 harness connector.

    Measure the resistance between the (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 above 70.0 ohms? 

    Yes 

    1. Go To step  3).

    No 

    1. Replace the A/C Heater Control in accordance with the Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. 3)  CHECK THE (C139) REAR MODE DOOR DRIVER CIRCUIT FOR AN OPEN 
    Fig 2: Checking Rear Mode Door Driver Circuit For Open
    GC0028260Courtesy of DAIMLERCHRYSLER CORP.

    Disconnect the Rear Mode Door Actuator harness connector.

    Measure the resistance of the (C139) Rear Mode Door Driver circuit between the Rear Mode Door Actuator harness connector and the A/C Heater Control C2 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the (C139) Rear Mode Door Driver circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  4. 4)  CHECK THE (C939) REAR MODE DOOR COMMON DRIVER CIRCUIT FOR AN OPEN 
    Fig 3: Checking Rear Mode Door Common Driver Circuit For Open
    GC0028261Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (C939) Rear Mode Door Common Driver circuit between the Rear Mode Door Actuator harness connector and the A/C Heater Control C2 harness connector.

    Is the resistance below 5.0 ohms? 

    No 

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

    Yes 

    1. Repair the (C939) Rear Mode Door Common Driver circuit for an open.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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