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 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

  • IG1 Relay Monitor(Inside)

  • IG2 Relay Monitor(Inside)

  • IG1 Relay Monitor(Outside)

  • IG2 Relay Monitor(Outside)

  • Latch Circuit

  • ACC Relay Monitor

 -

WIRING DIAGRAM

A01TAFZE05
A01TAQTE02
*a Certification ECU (Smart Key ECU Assembly)
*b Engine Room Relay Block and Junction Block Assembly

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine 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 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 entry and start system (for Start Function) uses the CAN communication system and LIN communication system. First inspect the communication systems 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 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

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

    Click here

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

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

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.

PROCEDURE


  1. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM


    1. Check the wireless door lock function by operating the electrical key transmitter sub-assembly.

      OK
      Wireless door lock function operates.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO OTHER DIAGNOSTIC PROCEDURE (All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    Result
    Proceed to
    OK
    NG

    1. B0043XZC29
      *a

      Rear view of wire harness connector

      (to Certification ECU (smart key ECU assembly))

      Disconnect the E33 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
      E33-2 (+B) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (GROUND)

    Result
    Proceed to
    OK
    NG

    1. B0043XZC30
      *a

      Rear 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
      E33-11 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ENTRY AND START SYSTEM


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

    2. A01TDEIC02
      *1 Engine Switch
      *2 Electrical Key Transmitter Sub-assembly

      With the brake pedal*1, *2 or clutch pedal*3 depressed, hold the electrical key transmitter sub-assembly near the engine switch and check if the power source mode changes.


      • *1: for CVT

      • *2: for Multi-Mode Manual Transaxle

      • *3: for Manual Transaxle

      Tech Tips

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

      OK
      The power source mode changes.
      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. READ VALUE USING GTS (STOP LIGHT SWITCH1)


    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.


      1. for CVT or Multi-Mode Manual Transaxle:


        Body Electrical > Power Source Control > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Stop Light Switch1 State of brake pedal ON or OFF

        ON: Brake pedal depressed

        OFF: Brake pedal released

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

        Body Electrical > Power Source Control > Data List
        Tester Display
        Stop Light Switch1
        OK
        ON (brake pedal is depressed) and OFF (brake pedal is released) appear on the screen.

      2. for Manual Transaxle:


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

        ON: Clutch pedal depressed

        OFF: Clutch pedal released

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

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

        Body Electrical > Power Source Control > Data List
        Tester Display
        Neutral SW/ Clutch SW
        OK
        ON (clutch pedal is depressed) and OFF (clutch pedal is released) appear on the screen.
      Result
      Result Proceed to
      OK A
      NG (for CVT or Multi-Mode Manual Transaxle) B
      NG (for Manual Transaxle) C

    B

    INSPECT STOP LIGHT SWITCH ASSEMBLY Click here

    C

    INSPECT ST NO.1 RELAY 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. 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
      Power Supply Condition Power supply state IG2 ON, ST ON, All OFF, IG1 ON or ACC ON

      ALL OFF: Engine switch off

      ACC ON: Engine switch on (ACC) (ACC relay on)

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

      Body Electrical > Power Source Control > Data List
      Tester Display
      Power Supply Condition

    6. With the engine switch off and brake pedal*1 or clutch pedal*2 depressed, hold the electrical key transmitter sub-assembly near the engine switch for 2 seconds or more and read the Data List.


      • *1: for CVT or Multi-Mode Manual Transaxle

      • *2: for Manual Transaxle

      Tech Tips

      If the smart key function has been canceled on the customization menu, ACC ON is displayed in the Data List.

      OK
      IG2 ON is displayed in the Data List.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FOR DTC Click here

    OK

  7. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. 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
      Power Supply Condition Power supply state IG2 ON, ST ON, All OFF, IG1 ON or ACC 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 the IG1 and IG2 relays turn on at approximately the same time, IG1 ON may not be displayed (the IG1 relay turns on for a very short time).

      Body Electrical > Power Source Control > Data List
      Tester Display
      Power Supply Condition

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

      A01TAQ1C30
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      E35-6 (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
      E33-9 (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
      E35-4 (ACCD) - Body ground Engine switch off 1 V or less
      Engine switch on (IG) 8.5 V or higher
      Engine switch on (ACC) 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK RELAY CONTACT SIDE CIRCUIT

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  8. CHECK FOR DTC


    1. Enter the following menus:

      for Entry&Start: Body Electrical / Entry&Start / Trouble Codes.


      Body Electrical > Entry&Start > Trouble Codes

    2. Check for DTCs.

      Result
      Result Proceed to

      The following DTCs are not output:


      • B2784

      • B278A

      		 A
      DTC B2784 is output. B
      DTC B278A is output. C

    A

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

    B

    GO TO DTC B2784 Click here

    C

    GO TO DTC B278A Click here

  9. INSPECT STOP LIGHT SWITCH ASSEMBLY

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  10. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/ VSC A
      w/o VSC B

    B

    GO TO STEP 12 Click here

    A

  11. INSPECT STOP LP RELAY

    Result
    Proceed to
    OK
    NG

    1. Remove the STOP LP relay.

    2. A01M0DFN05

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Voltage is not applied between terminals 1 and 2 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LP RELAY

    OK

  12. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the A1 stop light switch assembly connector.

    2. A01LW2WC12
      *a

      Rear view of wire harness connector

      (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
      E33-18 (STP1) - A1-1 Always Below 1 Ω
      E33-18 (STP1) or A1-1 - Body ground Always 10 kΩ or higher

    3. Reconnect the A1 stop light switch assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E33-18 (STP1) - Body ground Brake pedal released 1 V or less
      Brake pedal depressed 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. INSPECT ST NO.1 RELAY


    1. A01TB1R

      Remove the ST NO.1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 93.8 to 136.4 Ω
      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

    3. Reinstall the ST relay to the engine room relay block and junction block assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST NO.1 RELAY

    OK

  14. INSPECT CLUTCH START SWITCH ASSEMBLY

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the E33 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A5 clutch start switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E33-5 (STAR) - A5-2 Always Below 1 Ω
      E33-5 (STAR) or A5-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ST NO.1 RELAY)


    1. Disconnect the A5 clutch start switch assembly connector.

    2. Remove the ST NO. 1 relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-1 - 2 Always Below 1 Ω
      1 - Body ground Always Below 1 Ω
      A5-1 or 2 - 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

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


    1. 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 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.

      Body Electrical > Power Source Control > Data List
      Tester Display
      Start Switch1
      Start Switch2
      OK
      ON (Engine switch is pressed) and OFF (Engine switch is not pressed) appear on the screen.
      Result
      Result Proceed to
      NG A
      OK B

    B

    GO TO OTHER DIAGNOSTIC PROCEDURE (Room Oscillator does not Recognize Key) Click here

    A

  18. INSPECT ENGINE SWITCH


    1. Inspect the engine switch.

      for 1NR-FE: Click here

      for 1ZR-FAE: Click here

      for 1ND-TV: Click here

      for 8AR-FTS: Click here

      for 1ZR-FE: Click here

      for 2ZR-FE: Click here

      Result
      Result Proceed to
      OK A
      NG (for 1NR-FE) B
      NG (for 1ZR-FAE) C
      NG (for 1ND-TV) D
      NG (for 8NR-FTS) E
      NG (for 1ZR-FE) F
      NG (for 2ZR-FE) G

    B

    REPLACE ENGINE SWITCH Click here

    C

    REPLACE ENGINE SWITCH Click here

    D

    REPLACE ENGINE SWITCH Click here

    E

    REPLACE ENGINE SWITCH Click here

    F

    REPLACE ENGINE SWITCH Click here

    G

    REPLACE ENGINE SWITCH Click here

    A

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


    1. Disconnect the E35 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E35-28 (SSW1) - E36-5 (SS1) Always Below 1 Ω
      E35-30 (SSW2) - E36-1 (SS2) Always Below 1 Ω
      E35-28 (SSW1) or E36-5 (SS1) - Body ground Always 10 kΩ or higher
      E35-30 (SSW2) or E36-1 (SS2) - 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