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. A01IUFQE04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H71 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
      H71-2 (AM21) - Body ground Always 9.5 to 16 V
      H71-1 (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 H71 power management control ECU connector.

    2. A01IUFQE05
      Text in Illustration
      *1

      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
      H71-6 (GND) - Body ground Always Below 1 Ω
      H71-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the H71 power management control ECU and DM instrument panel junction block assembly connectors.

      A01IUHVE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H71-19 (ACCD) - DM-7 20°C (68°F) 75 to 117 Ω
      H71-19 (ACCD) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    NG

    Click here

    OK

  4. INSPECT ACC RELAY


    1. A01IN8WE02

      Remove the ACC relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    Click here

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connector.

      A01IUO1E11

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H71-19 (ACCD) - Body ground Engine switch off Below 1.0 V
      Engine switch on (ACC) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

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

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

  6. CHECK ENGINE SWITCH


    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ACC RELAY)

    OK

    END

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE ACC RELAY


    1. Replace the ACC relay with a new or normally functioning part, or repair or replace any damaged wire harness or connector.


    NEXT

  8. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connector.

      A01IUO1E11

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H71-19 (ACCD) - Body ground Engine switch off Below 1.0 V
      Engine switch on (ACC) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

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

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

  9. CHECK ENGINE SWITCH


    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ACC RELAY)

    OK

    END