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.

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

    Power Source Control

  • Power Supply Condition

  • IG Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

  • IG Circuit

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 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 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 the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

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

  • If the smart entry and start system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

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

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

    Click here

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

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.

PROCEDURE


  1. CHECK FOR DTC


    1. Using the GTS, check for DTCs.


      Body Electrical > Power Source Control > Trouble Codes
      Body Electrical > Entry&Start > Trouble Codes
      Body Electrical > Starting Control > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      Smart entry and start system (for Start Function) DTCs are output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - JUNCTION BLOCK ASSEMBLY LH)


    1. Disconnect the A58 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 4F and 4D junction block assembly LH connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-3 (IG1D) - 4F-16 Always Below 1 Ω
      4D-3 - Body ground Always Below 1 Ω
      A58-3 (IG1D) or 4F-16 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for 2AR-FE) A
      OK (for 2GR-FKS) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 RELAY) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

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


    1. Disconnect the A58 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 1D and 1E No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-3 (IG1D) - 1D-2 Always Below 1 Ω
      1E-4 - Body ground Always Below 1 Ω
      A58-3 (IG1D) or 1D-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK ASSEMBLY LH - IG NO. 4 RELAY)


    1. Disconnect the 4F junction block assembly LH connector.

    2. Remove the IG NO. 4 relay from No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-15 - 2 (IG NO. 4 relay) Always Below 1 Ω
      1 (IG NO. 4 relay) - Body ground Always Below 1 Ω
      4F-15 or 2 (IG NO. 4 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK JUNCTION BLOCK ASSEMBLY LH (IG1 NO. 1, IG1 NO. 2, IG1 NO. 3 RELAY)


    1. Remove the junction block assembly LH.

      Click here

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

      B006NG5C03
      *a

      Component without harness connected

      (Junction Block Assembly LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-16 - 4D-3 20°C (68°F) 87.32 to 127.14 Ω
      4K-1 - 4F-27 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      4K-1 - 4F-7 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      4K-1 - 4F-9 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE JUNCTION BLOCK ASSEMBLY LH Click here

    OK

  6. INSPECT IG NO. 4 RELAY


    1. Remove the IG NO. 4 relay from No. 2 engine room relay block.

    2. B006NWGC04
      *1 IG NO. 4 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω
      Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG NO. 4 RELAY

    OK

  7. INSPECT NO.1 INTEGRATION RELAY


    1. Remove the No. 1 integration relay.

      Click here

    2. Inspect the No. 1 integration relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here

    OK

  8. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the certification ECU (smart key ECU assembly) connector.

    2. Install the junction block assembly LH.

      Click here

    3. Install the No. 1 integration relay.

    4. Install the IG NO. 4 relay.

    5. B006LWQC65
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A58-3 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG2 RELAY)


    1. Disconnect the A58 certification ECU (smart key ECU assembly) connector.

    2. Remove the IG2 relay from the No. 1 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A58-3 (IG1D) - 1 (IG2 relay) Always Below 1 Ω
      2 (IG2 relay) - Body ground Always Below 1 Ω
      A58-3 (IG1D) or 1 (IG2 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (JUNCTION BLOCK ASSEMBLY LH - IG NO. 4 RELAY)


    1. Disconnect the 4F junction block assembly LH connector.

    2. Remove the IG NO. 4 relay from No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-15 - 2 (IG NO. 4 relay) Always Below 1 Ω
      1 (IG NO. 4 relay) - Body ground Always Below 1 Ω
      4F-15 or 2 (IG NO. 4 relay) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK JUNCTION BLOCK ASSEMBLY LH (IG1 NO. 1, IG1 NO. 2, IG1 NO. 3 RELAY)


    1. Remove the junction block assembly LH.

      Click here

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

      B006NG5C03
      *a

      Component without harness connected

      (Junction Block Assembly LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-16 - 4D-3 20°C (68°F) 87.32 to 127.14 Ω
      4K-1 - 4F-27 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      4K-1 - 4F-7 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      4K-1 - 4F-9 Battery voltage applied to terminals 4F-16 and 4D-3 Below 1 Ω
      Battery voltage not applied to terminals 4F-16 and 4D-3 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE JUNCTION BLOCK ASSEMBLY LH Click here

    OK

  12. INSPECT IG NO. 4 RELAY


    1. Remove the IG NO. 4 relay from No. 2 engine room relay block.

    2. B006NWGC04
      *1 IG NO. 4 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω
      Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG NO. 4 RELAY

    OK

  13. INSPECT IG2 RELAY


    1. Remove the IG2 relay from the No. 1 engine room relay block.

    2. B006NWGC04
      *1 IG2 Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage applied to terminals 1 and 2 Below 1 Ω
      Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IG2 RELAY

    OK

  14. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the certification ECU (smart key ECU assembly) connector.

    2. Install the junction block assembly LH.

      Click here

    3. Install the IG2 relay.

    4. Install the IG NO. 4 relay.

    5. B006LWQC65
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A58-3 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)