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

DESCRIPTION

If any of the following operations are performed, the certification ECU (smart key ECU assembly) receives a signal, and changes the power source mode.


Tech Tips

When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

Related Data List and Active Test Items
Problem Symptom Data List Item Active Test Item
Power source mode does not change to on (IG) or on (ACC)

    Power Source Control

  • Start Switch1

  • Start Switch2

  • Latch Circuit

  • IG1 Relay Monitor(Outside)

  • IG1 Relay Monitor(Inside)

  • IG2 Relay Monitor(Outside)

  • IG2 Relay Monitor(Inside)

  • ACC Relay Monitor

  • Power Supply Condition


    Engine

  • Ignition Status

 -

WIRING DIAGRAM

A004JMXE02

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Entry While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.

  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Click here.

  • If the entry and start system is disabled through the customize function, enable the system before performing troubleshooting Click here.

  • After completing repairs, confirm that the problem does not reoccur.

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

PROCEDURE


  1. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM (OPERATION)


    1. Check that the wireless door lock function operates normally Click here.

      OK
      Wireless door lock functions operate normally.

    NG

    GO TO ENTRY AND START SYSTEM (ALL DOOR ENTRY LOCK/UNLOCK FUNCTIONS AND WIRELESS FUNCTIONS DO NOT OPERATE) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A004IP3E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D48-2 (+B) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND)

    A004KBGE01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ENTRY AND START SYSTEM


    1. Remove the battery of the electrical key transmitter sub-assembly Click here.

    2. A004JHME02
      Text in Illustration
      *1 Engine Switch
      *2 Electrical Key Transmitter Sub-assembly (w/o Panic Switch)
      *3 Electrical Key Transmitter Sub-assembly (w/ Panic Switch)
      *4 Electrical Key Transmitter Sub-assembly
      *A Type A
      *B Type B

      With the brake pedal*1 or clutch pedal*2 depressed, hold the electrical key transmitter sub-assembly near the engine switch as shown in the illustration.


      • *1: for Automatic Transmission

      • *2: for Manual Transmission

    3. When touch the logo of the electrical key transmitter sub-assembly to the engine switch, check whether the power source mode changes.

      OK
      Power source mode changes.

      Tech Tips

      If the power source mode changes, the cabin verification is malfunctioning.

      Result
      Result Proceed to
      NG (Power source mode does not change) A
      OK (Power source mode changes) B

    B

    READ VALUE USING GTS (START SWITCH 1, 2) Click here

    A

  5. READ VALUE USING GTS (STOP LIGHT SWITCH1, NEUTRAL SW/CLUTCH SW)


    1. for Automatic Transmission


      1. Connect the GTS to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the GTS on.

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

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

        Power Source Control
        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Stop Light Switch1 State of brake pedal / OFF or ON

        OFF: Brake pedal released

        ON: Brake pedal depressed

        • Use this item to determine whether the stop light switch is malfunctioning.

        • The engine cannot be started when this item is "OFF".

        • When this item is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.
        OK
        ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen according to the stop light switch condition.

    2. for Manual Transmission


      1. Connect the GTS to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the GTS on.

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

      5. According to the display on the GTS, read the Data List.

        Power Source Control
        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        Neutral SW / Clutch SW State of clutch pedal / OFF or ON

        OFF: Clutch pedal released

        ON: Clutch pedal depressed

        • Use this item to help determine if the clutch switch is malfunctioning.

        • The engine cannot be started when this item is "OFF".
        OK
        ON (clutch pedal depressed) and OFF (clutch pedal released) appear on the screen according to the stop light switch condition.
        Result
        Result Proceed to
        OK A
        NG (for Automatic Transmission) B
        NG (for Manual Transmission) C

    B

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    C

    INSPECT CLUTCH START SWITCH ASSEMBLY Click here

    A

  6. READ VALUE USING GTS (POWER SUPPLY CONDITION)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.

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

      All OFF: Engine switch off (ACC and IG)

      ACC ON: Engine switch on (ACC))

      IG1 ON: Engine switch on (IG) (IG1 relay on)

      IG2 ON: Engine switch on (IG) (IG2 relay on)

      ST ON: Sending engine start request signal

      		 Since IG1 ON and IG2 ON turn on at approximately the same time, IG1 ON may not be displayed (IG1 ON turns on for a very short time).
      OK
      Display changes according to the changes in the power source mode when the engine switch is pushed.

    NG

    CHECK FOR DTC Click here

    OK

  7. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.

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

      All OFF: Engine switch off (ACC and IG)

      ACC ON: Engine switch on (ACC))

      IG1 ON: Engine switch on (IG) (IG1 relay on)

      IG2 ON: Engine switch on (IG) (IG2 relay on)

      ST ON: Sending engine start request signal

      		 Since IG1 ON and IG2 ON turn on at approximately the same time, IG1 ON may not be displayed (IG1 ON turns on for a very short time).

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

      A004KNTE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D41-6 (IG1D) - Body ground Engine switch off 1 V or less
      Engine switch on (ACC) 1 V or less
      Engine switch on (IG) 9 V or higher
      D48-9 (IG2D) - Body ground Engine switch off 1 V or less
      Engine switch on (ACC) 1 V or less
      Engine switch on (IG) 9 V or higher
      D41-4 (ACCD) - Body ground Engine switch off 1 V or less
      Engine switch on (ACC) 8.5 V or higher
      Engine switch on (IG) 8.5 V or higher

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  8. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Remove the stop light switch assembly Click here.

    2. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NOISE FILTER - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))


    1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A13 noise filter connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-18 (STP1) - A13-4 Always Below 1 Ω
      D48-18 (STP1) - Body ground Always 10 kΩ or higher
    4. A004JB6E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the A13 noise filter connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D48-18 (STP1) - Body ground Brake pedal released Below 1 V
      Brake pedal depressed 9 V or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Remove the clutch start switch assembly.


    2. Inspect the clutch start switch assembly.


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

    B

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    A

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY)


    1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A20 clutch start switch assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D48-10 (CLUT) - A20-2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D48-10 (CLUT) - Body ground Always 10 kΩ or higher
    4. A004H9EE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to certification ECU (smart key ECU assembly))

      Reconnect the A20 clutch start switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D48-10 (CLUT) - Body ground Clutch pedal released → clutch pedal depressed Below 1 V → 9 V or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK FOR DTC


    1. Check the DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC B2784 is output B
      DTC B2785 is output C

    A

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART (B2784) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART (B2785) Click here

  13. READ VALUE USING GTS (START SWITCH 1, 2)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. According to the display on the GTS, read the Data List.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Start Switch 1 Condition of engine switch contact 1 / OFF or ON

      OFF: Engine switch not pushed

      ON: Engine switch pushed

      • If the engine switch is pressed for a short time, the display may not change.

      • Use this item to determine whether the engine switch input signal is malfunctioning.
      Start Switch 2 Condition of engine switch contact 2 / OFF or ON

      OFF: Engine switch not pushed

      ON : Engine switch pushed

      • Backup for engine switch 1. However, when the engine switch is pressed and held, the control functions only when both engine switch 1 and 2 are normal.

      • Behaves the same way as engine switch 1.
      OK
      The ECU data monitor changes in response to the operation of the engine switch.
      Result
      Result Proceed to
      NG A
      OK B

    B

    GO TO ENTRY AND START SYSTEM (FOR ENTRY FUNCTION) (ROOM OSCILLATOR DOES NOT RECOGNIZE KEY) Click here

    A

  14. INSPECT ENGINE SWITCH


    1. Remove the engine switch Click here.

    2. Inspect the engine switch Click here.


    NG

    REPLACE ENGINE SWITCH Click here

    OK

  15. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE SWITCH)


    1. Disconnect the D41 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the D25 engine switch connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D41-28 (SSW1) - D25-5 (SSW1) Always Below 1 Ω
      D41-30 (SSW2) - D25-1 (SSW2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D41-28 (SSW1) or D25-5 (SSW1) - Body ground Always 10 kΩ or higher
      D41-30 (SSW2) or D25-1 (SSW2) - Body ground Always 10 kΩ or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR