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

  • If the room oscillator does not recognize the key, the cause of the malfunction may be stored in the certification ECU (smart key ECU assembly).

  • If the cause of the malfunction is stored in the certification ECU (smart key ECU assembly), the following table is helpful in checking whether or not the malfunction was caused by wave interference.

Radio Wave Interference:
Problem Symptom Data List Item
Operating Engine Switch / Key RF Signal Interference

  • When the engine switch was operated, the electrical key transmitter sub-assembly could not be confirmed due to wave interference. Therefore, the output frequency was switched to the other channel (changed from channel 1 to channel 2 or from channel 2 to channel 1).

  • If the cause of the malfunction has not been stored but any devices that can cause wave interference in the cabin have been removed and the room oscillator successfully recognizes the key, the possibility of wave interference is high.
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

  • Power Supply Condition

  • IG Relay Monitor (Inside)

  • IG Relay Monitor (Outside)

  • Latch Circuit

  • ACC Relay Monitor

 -

WIRING DIAGRAM

A01BDLGE01

INSPECTION PROCEDURE

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 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 smart entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

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

  • Before replacing the certification ECU (smart key ECU assembly), electrical key transmitter sub-assembly or ID code box (immobiliser code ECU), refer to the smart entry and start system (for Start Function) precaution Click here.

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

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

PROCEDURE


  1. CHECK TRANSMITTER BATTERY


    1. Press a switch of the electrical key transmitter sub-assembly and check that the transmitter LED illuminates.

      OK
      The electrical key transmitter sub-assembly LED illuminates.

    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 engine switch on (IG).

    3. Turn the GTS on.

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

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

      Entry&Smart
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Low Battery Transmitter battery depleted/Yes or No

      Yes: Transmitter battery depleted

      No: Transmitter battery not 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).
      OK
      "NO" is displayed in the Data List.

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

      OK
      The power source mode changes.

    NG

    CHECK SMART ENTRY AND START SYSTEM Click here

    OK

    END (AFFECTED BY WAVE INTERFERENCE)

  4. CHECK SMART ENTRY AND START SYSTEM


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

    2. A01BF5W

      With the brake pedal depressed, hold the electrical key transmitter sub-assembly near the engine 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

    READ VALUE USING GTS (START SWITCH1, START SWITCH2) Click here

    A

  5. CHECK FOR DTC


    1. Using the GTS, check for certification ECU (smart key ECU assembly) DTCs Click here.

      Result
      Result Proceed to
      DTCs are not output. A
      Smart 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)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

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

      A01BBSIE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      B75-1 (+B) - Body ground Always 11 to 14 V

    NG

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

    OK

  7. CHECK HARNESS AND CONNECTOR (GROUND)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

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

      A01BBSIE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-10 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IG1 RELAY)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-20 (IG1D) - 1 (IG1 relay) Always Below 1 Ω
      2 (IG1 relay) - Body ground
      B75-20 (IG1D) or 1 (IG1 relay) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT IG1 RELAY


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

    2. A01BEKDE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IG1 RELAY

    OK

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INTEGRATION RELAY)


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 12D and 12E No. 2 integration relay connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-20 (IG1D) - 12D-2 Always Below 1 Ω
      B75-21 (ACCD) - 12E-8
      12E-4 - Body ground
      B75-20 (IG1D) or 12D-2 - Body ground 10 kΩ or higher
      B75-21 (ACCD) or 12E-8 - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. INSPECT NO. 2 INTEGRATION RELAY


    1. Remove the No. 2 integration relay.

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

      A01BBCKE02
      Text in Illustration
      *a

      Component without harness connected

      (No. 2 Integration Relay)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      12A-1 - 12D-8 Battery voltage not applied to terminals 12D-2 and 12E-4 10 kΩ or higher
      Battery voltage applied to terminals 12D-2 and 12E-4 Below 1 Ω
      12E-7 - 12E-9 Battery voltage not applied to terminals 12E-8 and 12E-4 10 kΩ or higher
      Battery voltage applied to terminals 12E-8 and 12E-4 Below 1 Ω

    NG

    REPLACE NO. 2 INTEGRATION RELAY

    OK

  12. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Install the IG1 relay.

    3. Install the No. 2 integration relay.

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

      A01BDZ2E05
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      All OFF: Engine switch off (ACC and IG)

      ACC ON: Engine switch on (ACC)

      IG ON: Engine switch on (IG)

      ST ON: Sending engine start request signal

      		 -

    5. Measure the voltage while checking the Data List on the GTS.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B75-20 (IG1D) - Body ground Engine switch off 1 V or less
      Engine switch on (ACC)
      Engine switch on (IG) 9 V or higher
      B75-21 (ACCD) - Body ground Engine switch off 1 V or less
      Engine switch on (IG) 8.5 V or higher
      Engine switch on (ACC)

    NG

    READ VALUE USING GTS (START SWITCH1, START SWITCH2) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

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


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

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

      ON: Engine switch pressed

      OFF: Engine switch not pressed

      • 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 Switch2 Engine switch 2 status/ON or OFF

      ON: Engine switch pressed

      OFF: Engine switch not pressed

      • 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
      ON (engine switch is pressed) and OFF (engine switch is not pressed) appear on the screen.

    NG

    INSPECT ENGINE SWITCH Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  14. 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.


    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

  15. INSPECT ENGINE SWITCH


    1. Remove the engine switch Click here.

    2. Inspect the engine switch Click here.


    NG

    REPLACE ENGINE SWITCH Click here

    OK

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


    1. Disconnect the B75 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the I32 engine switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B75-18 (SSW1) - I32-5 (SS1) Always Below 1 Ω
      B75-16 (SSW2) - I32-1 (SS2)
      B75-24 (AGND) - I32-6 (AGND)
      B75-18 (SSW1) or I32-5 (SS1) - Body ground 10 kΩ or higher
      B75-16 (SSW2) or I32-1 (SS2) - Body ground
      B75-24 (AGND) or I32-6 (AGND) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)