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

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.

WIRING DIAGRAM

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

CAUTION / NOTICE / HINT

Note


  • When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


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


    1. A002OG3E02
      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. A002MD1E02
      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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY)


    1. A002NY7E02
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Disconnect the DE and DF instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DF-3 - DE-28 (relay coil side circuit) 20°C (68°F) 152 to 203 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

  4. INSPECT IG1 RELAY


    1. A002O25E01

      Remove the IG1 relay from the instrument panel junction block assembly.

    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

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


    1. Disconnect the H71 and H70 power management control ECU connectors.

      A002O5SE02
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H70-8 (IG2D) - Body ground 20°C (68°F) 255 to 387 Ω
      H71-20 (IG1D) - Body ground 20°C (68°F) 152 to 203 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Disconnect the H71 and H70 power management control ECU connectors.

      A002O5SE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (Power Management Control ECU)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H70-8 (IG2D) - Body ground 20°C (68°F) 255 to 387 Ω
      H71-20 (IG1D) - Body ground 20°C (68°F) 152 to 203 Ω
      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

  7. 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.

    OK

    END

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IG1 RELAY AND IG2 RELAY)

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY)


    1. Replace the instrument panel junction block (IG1 relay) with a new or normally functioning part, or repair or replace any damaged wire harness or connector.


    NEXT

  9. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connectors.

      A002OORE02
      Text in Illustration
      *1

      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
      H70-8 (IG2D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      H71-20 (IG1D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      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

  10. 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.

    OK

    END

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IG1 RELAY AND IG2 RELAY)