SMART ENTRY AND START SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedures to troubleshoot the smart entry and start system.

  • The intelligent tester can be used in steps 4, 5, 6 and 8.

  • When troubleshooting the smart entry and start system using the intelligent tester with the engine switch off, connect the intelligent tester to the vehicle and repeat turning any of the courtesy light switches on and off until communication between the tester and the vehicle begins (the interval between ON and OFF should be less than 1.5 sec.).


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS CHECK

    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.


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  4. INSPECT CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      (ECU connected, communication line malfunctioning) DTC is not output. A
      (ECU connected, communication line malfunctioning) DTC is output.

      B

      Click here


      B
      A
  5. INSPECT LIN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the LIN communication system is functioning normally.

      Result
      Result Proceed to
      (ECU connected, communication line malfunctioning) DTC is not output. A
      (ECU connected, communication line malfunctioning) DTC is output.

      B

      Click here


      A
      B
  6. CHECK FOR DTC


    1. Check for DTCs. Based on the DTCs output, try to cause the same steering lock system DTC, engine immobiliser system DTC, wireless door lock control system DTC or smart entry and start system (starting) DTC to be output by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      Steering lock system DTC is not output.

      A

      Click here

      Engine immobiliser system DTC is output.

      B

      Click here

      Wireless door lock control system DTC is output.

      C

      Click here

      Smart entry and start system (starting) DTC is output.

      D

      Click here

      DTC is not output. E

      A
      B
      C
      D
      E
  7. 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
    A
  8. OVERALL ANALYSIS AND TROUBLESHOOTING


    1. OPERATION CHECK Click here

    2. DATA LIST/ACTIVE TEST Click here

    3. TERMINALS OF ECU Click here


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  9. REPAIR OR REPLACE


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  10. CONFIRMATION TEST


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