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 key in the cabin, the power management control ECU receives signals to switch the power source mode.

Tech Tips

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

WIRING DIAGRAM

Refer to "Power Source Mode does not Change to on (IG and ACC)" Click here.

INSPECTION PROCEDURE

PROCEDURE


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


    1. A009C2XE06
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the G51 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G51-2 (AM21) - Body ground Always 9.5 to 14 V
      G51-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the G51 power management control ECU connector.

    2. A009C2XE07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-6 (GND) - Body ground Always Below 1 Ω
      G51-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. A009528E06
      Text in Illustration
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      Remove the driver side junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-48 - 2D-4 20°C (68°F) 101.25 to 123.75 Ω

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the G51 power management control ECU connector.

    2. Disconnect the 2A driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-19 (ACCD) - 2A-48 Always Below 1 Ω
      G51-19 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. Disconnect the 2D driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-4 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connector.

      A0097B5E16
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G51-19 (ACCD) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  7. CONFIRMATION TEST


    1. Check that the power source mode changes to on (ACC) and on (IG) when operating the engine switch.

      OK
      The power source mode changes to on (ACC) and on (IG) in response to the operation of the engine switch.

    NG

    CHECK RELAY CONTACT SIDE CIRCUIT

    OK

    USE SIMULATION METHOD TO CHECK Click here