ENTRY AND START SYSTEM (for Entry Function) HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedure to troubleshoot the entry and start system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


    NEXT

  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? Running conditions, driving conditions, weather conditions
    How did it happen? Problem symptoms

    NEXT

  3. INSPECT BATTERY VOLTAGE


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

      Standard Voltage
      11 to 14 V

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


      NEXT

  4. INSPECT COMMUNICATION FUNCTION OF 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 is normal. A
      ECU connected, communication line is malfunctioning. B

      B

      GO TO CAN COMMUNICATION SYSTEM Click here

      A

  5. INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM (LIN)*


    1. Use the intelligent tester to check if the LIN communication system (LIN) is functioning normally Click here.

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

      B

      GO TO LIN COMMUNICATION SYSTEM Click here

      A

  6. CHECK FOR DTC*


    1. Check for DTCs and note any codes that are output.

    2. Clear the DTCs.

    3. Recheck 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 entry and start system (for start function) DTC to be output by simulating the symptoms indicated by the DTCs.

      Result
      Result Proceed to
      DTC is not output. A
      Steering lock system DTC is output. B
      Engine immobiliser system DTC is output. C
      Wireless door lock control system DTC is output. D
      Entry and start system (for start function) DTC is output. E

      B

      GO TO STEERING LOCK SYSTEM Click here

      C

      GO TO ENGINE IMMOBILISER SYSTEM Click here

      D

      GO TO WIRELESS DOOR LOCK CONTROL SYSTEM SYSTEM Click here

      E

      GO TO ENTRY AND START SYSTEM (for Start Function) Click here

      A

  7. CHECK KEY


    1. Confirm that the entry function operates normally for all registered keys Click here.

      Tech Tips

      For vehicles with a key (for card type), confirm operation of both the key (for card type) and keys (for standard).


      NEXT

  8. 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 10
      A

  9. OVERALL ANALYSIS AND TROUBLESHOOTING*


    1. Operation Check Click here

    2. Data List / Active Test Click here

    3. Terminals of ECU Click here


      NEXT

  10. REPAIR OR REPLACEMENT


    NEXT

  11. CONFIRMATION TEST


    NEXT
    END