HORN SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use these procedures to troubleshoot the horn system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. INSPECT BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

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


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  3. INSPECT COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*


    1. Using the intelligent tester, check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

      B

      Go to CAN COMMUNICATION SYSTEM Click here

      C

      Go to CAN COMMUNICATION SYSTEM Click here

      A

  4. PROBLEM SYMPTOMS TABLE

    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

  5. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List / Active Test Click here

    2. Terminals of ECU Click here


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  6. ADJUST, REPAIR OR REPLACE


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  7. CONFIRMATION TEST


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    END