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

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DTC Code DTC Name
  Power Source Mode does not Change to ON (IG)
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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.

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WIRING DIAGRAM

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

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INSPECTION PROCEDURE

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.

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PROCEDURE


  1. Click here

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


    1. A01IUFQE04

      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
      Table 1. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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


    1. Disconnect the H71 power management control ECU connector.

    2. A01IUFQE05

      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
      Table 2. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

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    CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY)


    1. A01INT1E01

      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
      Table 3. Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

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    INSPECT IG1 RELAY


    1. A01IUBFE51

      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

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


    1. A01IPYFE02

      Disconnect the H71 and H70 power management control ECU connectors.

    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
      Table 4. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -

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    CHECK POWER MANAGEMENT CONTROL ECU


    1. A01IPYFE02

      Disconnect the H71 and H70 power management control ECU connectors.

    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
      Table 5. Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -
      Table 6. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

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    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.

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    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.


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    CHECK POWER MANAGEMENT CONTROL ECU


    1. A01IUO1E10

      Connect the power management control ECU connectors.

    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
      Table 7. Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      		 - -
      Table 8. Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

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    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.

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE POWER MANAGEMENT CONTROL ECUClick here

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    END

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

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    REPLACE POWER MANAGEMENT CONTROL ECUClick here