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

WIRING DIAGRAM

A00JUC3E01

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.

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. READ VALUE USING INTELLIGENT TESTER (KEY CERTIFI WAIT T-OUT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the intelligent tester on.

      Tech Tips

      When using the intelligent tester with the engine switch off, turn any of the door courtesy light switches on and off repeatedly at intervals of 1.5 seconds or less until communication between the tester and vehicle starts.

    3. Enter the following menus: Body / Power Source Control / Data List.

    4. Read the Data List and check that "No" is displayed 1 second after turning the engine switch from off to on (IG).

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Certifi Wait T-Out Key certification waiting timed out / Yes or No

      Yes: Key certification waiting timed out

      No: Key certification completed within specified time

      		 -
      OK
      "No" is displayed 1 second after turning the engine switch from off to on (IG).

    NG

    CHECK FOR DTC Click here

    OK

  4. READ VALUE USING INTELLIGENT TESTER (START SWITCH 1, 2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Power Source Control / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Start Switch1 Start Switch 1 / ON or OFF

      ON: Engine switch pushed

      OFF: Engine switch not pushed

      		 -
      Start Switch2 Start Switch 2 / ON or OFF

      ON: Engine switch pushed

      OFF: Engine switch not pushed

      		 -
      OK
      The display changes in response to the operation of the engine switch.

    NG

    INSPECT ENGINE SWITCH Click here

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Power Source Control / Data List.

    5. Read the Data List and check that the display changes according to the changes in the power source mode when the engine switch is pushed.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Condition Power Supply Condition / IG2 ON, ST ON, All OFF, IG1 ON or ACC ON

      IG2 ON: IG2 relay on

      ST ON: ST request signal on

      All OFF: All relays off

      IG1 ON: IG1 relay on

      ACC ON: ACC relay on

      		 -
      OK
      Display changes according to the changes in the power source mode when the engine switch is pushed.

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

      A00JXEVE19
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G51-20 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC)
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      G50-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (ACC)
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      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
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  6. 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

  7. INSPECT ENGINE SWITCH


    1. A00JZABE02
      Text in Illustration
      *a

      Component without harness connected

      (Engine Switch)

      Remove the engine switch.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      7 (SS1) - 5 (GND) Engine switch not pushed 10 kΩ or higher
      Engine switch pushed Below 1 Ω
      2 (SS2) - 5 (GND) Engine switch not pushed 10 kΩ or higher
      Engine switch pushed Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE, LHD) B
      NG (for 1GR-FE, RHD) C
      NG (for 1KD-FTV, LHD) D
      NG (for 1KD-FTV, RHD) E

    B

    REPLACE ENGINE SWITCH Click here

    C

    REPLACE ENGINE SWITCH Click here

    D

    REPLACE ENGINE SWITCH Click here

    E

    REPLACE ENGINE SWITCH Click here

    A

  8. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - ENGINE SWITCH)


    1. Disconnect the G51 power management control ECU connector.

    2. Disconnect the G36 engine switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-17 (SSW2) - G36-2 (SS2) Always Below 1 Ω
      G51-18 (SSW1) - G36-7 (SS1)
      G51-17 (SSW2) - Body ground Always 10 kΩ or higher
      G51-18 (SSW1) - Body ground
      G36-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  9. CHECK FOR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Power Source / DTC.

    5. Read the DTCs.

    6. Enter the following menus: Body / Entry&Start / DTC.

    7. Read the DTCs.

      Result
      Result Proceed to

      None of the following DTCs are output:

      B2785 Communication Malfunction between ECUs Connected by LIN

      B2287 LIN Communication Master Malfunction

      B2784 Antenna Coil Open/Short

      		 A
      DTC B2287 is output but B2785 is not B
      A DTC other than B2287 is output. C

    B

    GO TO DTC (B2287) Click here

    C

    GO TO DTC CHART Click here

    A

    GO TO ENTRY AND START SYSTEM (FOR ENTRY FUNCTION) (Room Oscillator does not Recognize Key) Click here