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.


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

    Power Source Control

  • Start Switch1

  • Start Switch2

  • IG Relay Monitor (Inside)

  • ACC Relay Monitor

  • IG Relay Monitor (Outside)

  • Latch Circuit

  • Power Supply Condition

WIRING DIAGRAM

A0021U4E03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off, connect the GTS to the DLC3 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). 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 (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click here

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

  • If the entry and start system (for Start Function) has been canceled, enable the system before performing troubleshooting.

    Click here

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

  • Before replacing the electrical key transmitter sub-assembly or certification ECU (smart key ECU assembly), refer to entry and start system (for Start Function) Precaution.

    Click here

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

Tech Tips

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE


  1. CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY


    1. Press a switch of the electrical key transmitter sub-assembly.

      OK
      The electrical key transmitter sub-assembly LED illuminates.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT TRANSMITTER BATTERY Click here

    OK

  2. READ VALUE USING GTS (KEY LOW BATTERY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Entry&Start / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Entry&Start > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Key Low Battery Transmitter battery depleted No or Yes

      No: Transmitter battery not depleted

      Yes: Transmitter battery depleted

      		 The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. The certification ECU (smart key ECU assembly) displays "Yes" for the "Key Low Battery" item of the Data List when this voltage information indicates 2.2 V or less. This Data List item should be checked when the electrical key transmitter sub-assembly is at room temperature (example: at -20°C (-4°F), "Yes" may be displayed even if the transmitter battery is new).

      Body Electrical > Entry&Start > Data List
      Tester Display
      Key Low Battery
      OK
      "No" is displayed on the GTS screen.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

  3. CHECK POWER SOURCE MODE


    1. Get into the vehicle while carrying an electrical key transmitter sub-assembly.

    2. Move the shift lever to P.

    3. Press the power switch with the brake pedal released and check that the power source mode changes.

      Result
      Result Proceed to
      The power source mode changes A
      The power source mode does not change B

    A

    END (AFFECTED BY WAVE INTERFERENCE)

    B

  4. CHECK ENTRY AND START SYSTEM (for Start Function)


    1. Remove the transmitter battery from the electrical key transmitter sub-assembly.

    2. A0021OF

      With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the power switch and check if the power source mode changes.

      OK
      The power source mode changes.

      Tech Tips

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

      Result
      Result Proceed to
      The power source mode does not change A
      The power source mode changes B

    B

    GO TO STEP 13 Click here

    A

  5. CHECK FOR DTC


    1. Using the GTS, check for DTCs.


      Body Electrical > Power Source Control > Trouble Codes
      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      Entry and start system (for Start Function) DTCs are output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  6. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    Result
    Proceed to
    OK
    NG

    1. A002177C52
      *a

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the K137 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
      K137-10 (+B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  7. CHECK HARNESS AND CONNECTOR (GROUND)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the K137 certification ECU (smart key ECU assembly) connector.

    2. A002177C53
      *a

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K137-11 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the A83 and K137 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the 4B and 4C instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K137-9 (ACCD) - 4B-19 Always Below 1 Ω
      K137-3 (IG1D) - 4C-22 Always Below 1 Ω
      4B-7 - Body ground Always Below 1 Ω
      K137-9 (ACCD) or 4B-19 - Body ground Always 10 kΩ or higher
      K137-3 (IG1D) or 4C-22 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2, IG1 NO. 3, ACC RELAY)


    1. Remove the instrument panel junction block assembly.

      Click here

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

      A00209EC02
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-22 - 4B-7 20°C (68°F) 87.32 to 127.14 Ω
      4B-19 - 4B-7 20°C (68°F) 130.92 to 190.74 Ω
      4E-1 - 4A-16 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      4E-1 - 4A-35 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      4E-1 - 4B-32 Auxiliary battery voltage applied to terminals 4C-22 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4C-22 and 4B-7 10 kΩ or higher
      4E-1 - 4C-20 Auxiliary battery voltage applied to terminals 4B-19 and 4B-7 Below 1 Ω
      Auxiliary battery voltage not applied to terminals 4B-19 and 4B-7 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  10. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Install the instrument panel junction block assembly.

      Click here

    2. Reconnect the A83 and K137 certification ECU (smart key ECU assembly) connectors.

    3. Measure the voltage while confirming the power source mode on the Data List.

      A0021DOC32
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -

      Body Electrical > Power Source Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Power Supply Condition Power supply state All OFF, ACC ON, IG ON or ST ON

      All OFF: Power switch off (ACC and IG)

      ACC ON: Power switch on (ACC)

      IG ON: Power switch on (IG)

      ST ON: Sending hybrid control system start request signal

      		 -

      Body Electrical > Power Source Control > Data List
      Tester Display
      Power Supply Condition
      Standard Voltage
      Tester Connection Condition Specified Condition
      A83-3 (IG1D) - Body ground Power switch off 1 V or less
      Power switch on (ACC) 1 V or less
      Power switch on (IG) 9 V or higher
      K137-9 (ACCD) - Body ground Power switch off 1 V or less
      Power switch on (ACC) 8.5 V or higher
      Power switch on (IG) 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  11. READ VALUE USING GTS (START SWITCH1, START SWITCH2)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Source Control > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Start Switch1 Power switch 1 status OFF or ON

      OFF: Power switch not pressed

      ON: Power switch pressed

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

      • Use this item to determine whether the power switch input signal is malfunctioning.
      Start Switch2 Power switch 2 status OFF or ON

      OFF: Power switch not pressed

      ON: Power switch pressed

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

      • Behaves the same way as power switch 1.

      Body Electrical > Power Source Control > Data List
      Tester Display
      Start Switch1
      Start Switch2
      OK
      The GTS display changes correctly in response to the power switch operation.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    INSPECT POWER SWITCH Click here

  12. INSPECT TRANSMITTER BATTERY


    1. Inspect the transmitter battery.

      Click here

      Note

      Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. The terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

    NG

    REPLACE TRANSMITTER BATTERY Click here

  13. INSPECT POWER SWITCH


    1. Remove the power switch.

      Click here

    2. Inspect the power switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER SWITCH Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - POWER SWITCH)


    1. Disconnect the K137 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the K50 power switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K137-16 (SSW1) - K50-5 (SS1) Always Below 1 Ω
      K137-18 (SSW2) - K50-1 (SS2) Always Below 1 Ω
      K137-12 (AGND) - K50-6 (AGND) Always Below 1 Ω
      K137-16 (SSW1) or K50-5 (SS1) - Body ground Always 10 kΩ or higher
      K137-18 (SSW2) or K50-1 (SS2) - Body ground Always 10 kΩ or higher
      K137-12 (AGND) or K50-6 (AGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR