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

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.

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

    Power Source Control

  • Power Supply Condition

  • ACC Relay Monitor

-

WIRING DIAGRAM

Refer to DTC B2274 Click here

INSPECTION PROCEDURE

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 (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 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 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 entry and start system (for Start Function) precaution Click here.

  • Inspect the fuses for 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) - COWL SIDE JUNCTION BLOCK RH)


    1. Disconnect the N93 connector from the certification ECU (smart key ECU assembly).

    2. Disconnect the 4A connector from the cowl side junction block RH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N93-4 (ACCD) - 4A-19 Always Below 1 Ω
      4A-4 - Body ground
      N93-4 (ACCD) or 4A-19 - Body ground 10 kΩ or higher

    NG
    OK
  2. INSPECT COWL SIDE JUNCTION BLOCK RH (RH-ACC RELAY)


    1. Remove the cowl side junction block RH.

      A01FI4ZE01
      Text in Illustration
      *a

      Component without harness connected

      (Cowl Side Junction Block RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4E-1 - 4A-45 Battery voltage not applied to terminals 4A-19 and 4A-4 10 kΩ or higher
      Battery voltage applied to terminals 4A-19 and 4A-4 Below 1 Ω

    NG
    OK
  3. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A01FD9EE06
    Text in Illustration
    *a

    Component with harness connected

    (Certification ECU (Smart Key ECU Assembly))


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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N93-4 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher

    NG
    OK