HEATED WINDSHIELD DEFROSTER SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedure to troubleshoot the heated windshield defroster system.

  • *: Use the GTS.


  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. PRE-CHECK


    1. Measure the battery voltage with the engine switch off.

      Standard voltage
      11 to 14 V

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

    2. Check the fuses and relays.

    3. Check the connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.


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  4. 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

  5. PROBLEM SYMPTOMS TABLE


    1. Refer to the 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 6
      A

  6. 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


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  7. REPAIR OR REPLACE


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  8. CONFIRMATION TEST


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    END