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

DESCRIPTION

When the electrical key transmitter sub-assembly is in the vehicle and the engine switch is pressed, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Use this troubleshooting procedure when the power source mode does not change to on (ACC) but does change to on (IG).

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

A004HTLE04

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the GTS 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 reoccur.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU)


    1. Disconnect the D41 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
      D41-4 (ACCD) - 3A-20 Always Below 1 Ω
      3A-12 - Body ground Always Below 1 Ω
      D41-4 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


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

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

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

      A004ISTE02
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3E-1 - 3B-28 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3A-20 and 3A-12 Below 1 Ω
      3E-1 - 3A-10 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3A-20 and 3A-12 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  3. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Install the main body ECU (network gateway ECU) to the instrument panel junction block assembly Click here.

    2. Install the instrument panel junction block assembly.

    3. A004JOUE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the D41 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D41-4 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) Below 1 V → 8.5 V or higher

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)