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 is in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

Tech Tips

When the battery cable is disconnected and reconnected, the power source mode returns to the mode it was in before the battery cable was disconnected.

WIRING DIAGRAM

A01VJ0QE02

CAUTION / NOTICE / HINT

Note


  • When using the intelligent tester with the engine switch off to troubleshoot:

    Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

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

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

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

PROCEDURE


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


    1. Disconnect the F65 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 1D 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
      F65-9 (IG2D) - 1D-17 Always Below 1 Ω
      1E-10 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Inspect the No. 1 integration relay.


      Result
      Result Proceed to
      OK A
      NG (for 1KR-FE) B
      NG (for 1NR-FE) C
      NG (for 1ND-TV) D

    B

    REPLACE NO. 1 INTEGRATION RELAY Click here

    C

    REPLACE NO. 1 INTEGRATION RELAY Click here

    D

    REPLACE NO. 1 INTEGRATION RELAY Click here

    A

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


    1. Disconnect the F63 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3A and 3B instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Connection Specified Condition
      F63-6 (IG1D) - 3A-29 Always Below 1 Ω
      3B-8 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY ((IG1 NO. 1, IG1 NO. 2, IG1NO. 3 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.

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

      A01VLSBE02
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      for LHD
      Tester Connection Connection Specified Condition
      3E-1 - 3A-54 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω
      3E-1 - 3A-9 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω
      3E-1 - 3A-3 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω
      for RHD
      Tester Connection Connection Specified Condition
      3F-1 - 3A-54 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω
      3F-1 - 3A-9 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω
      3F-1 - 3A-3 Battery voltage not applied to terminals 3A- 29 and 3B-8 10 kΩ or higher
      Battery voltage applied to terminals 3A-29 and 3B-8 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

      A01VGUEE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F63-6 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) Below 1 V → 9 V or higher
      F65-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) Below 1 V → 9 V or higher

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)