WINDOW DEFOGGER SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


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

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  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 AUXILIARY BATTERY VOLTAGE


    1. Measure the auxiliary battery voltage with the power switch off.

      Standard Voltage
      11 to 14 V

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


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


    1. Check the AVC-LAN communication function to ensure there are no malfunctions in the communication system Click here for Models without Navigation System, Click here for Models with Navigation System (for DVD), Click here for Models with Navigation System (for HDD)).

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output (w/o Navigation System). B
      DTC is output (w/ Navigation System (for DVD)). C
      DTC is output (w/ Navigation System (for HDD)). D

      B

      GO TO AUDIO AND VISUAL SYSTEM Click here

      C

      GO TO NAVIGATION SYSTEM (for DVD) Click here

      D

      GO TO NAVIGATION SYSTEM (for HDD) Click here

      A

  5. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/ Navigation System A
      w/o Navigation System B

      B

      Go to step 7
      A

  6. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Check the CAN communication function to ensure there are no malfunctions in the communication system.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. B

      B

      GO TO CAN COMMUNICATION SYSTEM Click here

      A

  7. 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 9
      A

  8. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Terminals of ECU Click here

    2. Data List / Active Test Click here

    3. On-vehicle Inspection Click here


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  9. REPAIR OR REPLACE


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  10. CONFIRMATION TEST


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    END