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

Tech Tips


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

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS


    1. Interview the customer to confirm the problem Click here.


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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. CHECK 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 normal A
      ECU connected, communication line malfunctioning B

      B

      GO TO CAN COMMUNICATION SYSTEM Click here

      A

  5. CHECK 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 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 smart entry and start system (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
      Smart entry and start system (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 Click here

      E

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

      A

  7. 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 9
      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 REPLACEMENT


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  10. CONFIRMATION TEST


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    END