SMART ENTRY AND START SYSTEM (for Start Function) Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

Tech Tips

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

WIRING DIAGRAM

A01G6JZE01

INSPECTION PROCEDURE

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The smart entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Click here.

  • If the smart entry and start system is disabled through the customize function, enable the system before performing troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart entry and start system (for Start Function) precaution Click here.

  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

  • After completing repairs, confirm that the problem does not occur.

Tech Tips

Related Data List and Active Test Items
Problem Symptom Data List Item Active Test Item
Power source mode does not change to on (IG) but does change to on (ACC)

    Power Source Control

  • Power Supply Condition

  • IG1 Relay Monitor (Inside)

  • IG2 Relay Monitor (Inside)

  • IG1 Relay Monitor (Outside)

  • IG2 Relay Monitor (Outside)

  • IG1 Circuit

  • IG2 Circuit

-

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INTEGRATION RELAY)


    1. Disconnect the A36 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 1C and 1E No. 1 integration relay connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-9 (IG2D) - 1C-8 Always Below 1 Ω
      1E-2 - Body ground Always Below 1 Ω
      A36-9 (IG2D) or 1C-8 - Body ground Always 10 kΩ or higher

    NG
    OK
  2. INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)


    1. for 2AR-FE


      1. Remove the No. 1 integration relay Click here.

      2. Inspect the No. 1 integration relay Click here.

    2. for 2GR-FE


      1. Remove the No. 1 integration relay Click here.

      2. Inspect the No. 1 integration relay Click here.

      Result
      Result Proceed to
      OK A
      NG (for 2AR-FE) B
      NG (for 2GR-FE) C

    B
    C
    A
  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the H56 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3A instrument panel junction block assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H56-6 (IG1D) - 3A-27 Always Below 1 Ω
      3B-7 - Body ground Always Below 1 Ω
      H56-6 (IG1D) and 3A-27 - Body ground Always 10 kΩ or higher

    NG
    OK
  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2, IG1 NO. 3 AND IG1 NO. 4 RELAY)


    1. Remove the instrument panel junction block assembly Click here.

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly Click here.

    3. Measure the resistance according to the value(s) in the table below.

      A01G5TSE05
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      - -
      Standard Resistance
      Tester Connection Condition Specified Condition

      • 3E-1 - 3D-33

        (IG1 No. 1 relay)

      • 3E-1 - 3D-36

        (IG1 No. 2 relay)

      • 3E-1 - 3C-4

        (IG1 No. 3 relay)

      • 3E-1 - 3C-14

        (IG1 No. 4 relay)

      Battery voltage not applied to terminals 3A-27 and 3B-7 10 kΩ or higher
      Battery voltage applied to terminals 3A-27 and 3B-7 Below 1 Ω

    NG
    OK
  5. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Measure the voltage according to the value(s) in the table below.

      A01G7SQE27
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      A36-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      H56-6 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher

    NG
    OK