WINDOW DEFOGGER SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedure to troubleshoot the window defogger system.

  • *: Use the GTS.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  2. CUSTOMER PROBLEM ANALYSIS

    Tech Tips


    • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.

    • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

    • The following 5 items are important points in the problem analysis:

    What Vehicle model, system name
    When Date, time, occurrence frequency
    Where Road conditions
    Under what conditions? Driving conditions, weather conditions
    How did it happen? Problem symptoms

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  3. INSPECT BATTERY VOLTAGE


    1. Measure the battery voltage.

      Standard Voltage
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.


      NEXT

  4. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Multi-display A
      w/ Multi-display B

      B

      Go to step 7
      A

  5. CHECK COMMUNICATION FUNCTION OF AVC-LAN COMMUNICATION SYSTEM*


    1. Check for AVC-LAN communication system DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output (w/ Audio and Visual System (w/o Multi-display)). B

      B

      GO TO AUDIO AND VISUAL SYSTEM Click here

      A

  6. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*


    1. Check for LIN communication system DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

      A

      GO TO AIR CONDITIONING SYSTEM Click here

      B

      Go to step 8

  7. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Check for CAN communication system DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

      B

      GO TO CAN COMMUNICATION SYSTEM Click here

      A

  8. PROBLEM SYMPTOMS TABLE


    1. Refer to Problem Symptoms Table Click here.

      Result
      Result Proceed to
      Fault is not listed in Problem Symptoms Table. A
      Fault is listed in Problem Symptoms Table. B

      B

      Go to step 10
      A

  9. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Operation Check Click here.

    2. Terminals of ECU Click here.

    3. Data List / Active Test Click here.

    4. On-vehicle Inspection Click here.


      NEXT

  10. REPAIR OR REPLACE


    NEXT

  11. CONFIRMATION TEST


    NEXT
    END