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Diagnostic Test

WARNING: This page is about a different car, the 2008 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
  1. ESTABLISH COMMUNICATION WITH THE A/C-HEATER CONTROL (ATC) ON THE PCI BUS 
    NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

    Turn the ignition on.

    NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

    With the scan tool, select ECU View.

    NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

    Does the scan tool communicate with the A/C-HEATER CONTROL (ATC)? 

    Yes 

    1. Go To step  2.

    No 

    1. Perform the appropriate no response test. See DIAGNOSIS AND TESTING .
  2. (Z24) GROUND CIRCUIT OPEN 
    Fig 1: A/C-Heater Control (ATC) Harness Connector - Pin 2
    GC0048608Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C-Heater Control (ATC) harness connector.

    Using a 12-volt test light connected to 12-volts, probe the (Z24) ground circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  3.

    No 

    1. Repair the (Z24) Ground circuit for an open.
    2. Perform BODY VER TEST - VER 1 .
  3. (A118) FUSED B(+) CIRCUIT OPEN 
    Fig 2: A/C-Heater Control (ATC) Harness Connector - Pin 14
    GC0048609Courtesy of CHRYSLER LLC

    Using a 12-volt test light connected to ground, probe the (A118) Fused B(+) circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  4.

    No 

    1. Repair the (A118) Fused B(+) circuit for an open.
    2. Perform BODY VER TEST - VER 1 .
  4. (F504) FUSED RUN RELAY OUTPUT CIRCUIT OPEN 
    Fig 3: A/C-Heater Control (ATC) Harness Connector - Pin 1
    GC0048610Courtesy of CHRYSLER LLC

    Turn the ignition on.

    Using a 12-volt test light connected to ground, probe the (F504) Fused Run Relay Output circuit.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  5.

    No 

    1. Repair the (F504) Fused Run Relay Output circuit for an open.
    2. Perform BODY VER TEST - VER 1 .
  5. (D25) PCI BUS CIRCUIT OPEN 
    Fig 4: Measuring The Resistance Of The (D25) PCI Bus Circuit Between The A/C-Heater Control (ATC) Harness Connector And The DLC Connector
    GC0048611Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the negative battery cable.

    Disconnect the scan tool from the DLC connector.

    Measure the resistance of the (D25) PCI Bus circuit between the A/C-Heater Control (ATC) harness connector and the DLC connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the A/C-Heater Control (ATC) in accordance with the service information.
    2. Perform BODY VER TEST - VER 1 .

    No 

    1. Repair the (D25) PCI Bus circuit for an open.
    2. Perform BODY VER TEST - VER 1 .
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