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

DESCRIPTION

When the engine switch is pushed with the electrical key in the cabin, the power management control ECU receives signals to change the power source mode.

Tech Tips

To allow use of the intelligent tester to inspect the push-button start function when the power source mode is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the intelligent tester and the power management control ECU. (Opening and closing a door can also be simulated by operating a door courtesy light switch.)

WIRING DIAGRAM

Refer to DTC B2274 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. A019PLOE08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the F8 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F8-1 (AM22) - Body ground Always 9.5 to 16 V
      F8-2 (AM21) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

    OK

  2. CHECK HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. A019PLOE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the F8 connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-5 (GND2) - Body ground Always Below 1 Ω
      F8-6 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A019O3UE02
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-3 - 2A-17 20°C (68°F) 81.49 to 118.98 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR


    1. A019O6GE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)
      *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F8-19 (ACCD) - 2A-17 Always Below 1 Ω
      F8-19 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. A019KC5E02
      Text in illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-3 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)

    OK

  6. INSPECT POWER MANAGEMENT CONTROL ECU


    1. A019OK1E02
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      Reinstall the instrument panel junction block assembly Click here.

    2. Reconnect the F8 connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F8-19 (ACCD) - Body ground Engine switch on (ACC) Output voltage at terminal AM21 or AM22 -2.5 V or more

    4. Proceed to the next step based on the inspection result.

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here