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. CHECK FOR DTC (ELECTRIC POWER CONTROL SYSTEM)*


    1. Using the intelligent tester, check if the electric power control system is functioning normally.

      Result
      Result Proceed to
      DTC B22B3 is not output A
      DTC B22B3 is output B

      B

      Go to ELECTRIC POWER CONTROL SYSTEM Click here

      A

  4. 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 (for LHD) Click here

      C

      Go to CAN COMMUNICATION SYSTEM (for RHD) Click here

      A

  5. 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 7
    A

  6. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Data List / Active Test Click here

    2. Terminals of ECU Click here


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  7. ADJUST, REPAIR OR REPLACE


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  8. CONFIRMATION TEST


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    END