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SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2278

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DTC Code DTC Name
B2278 Engine/Power Switch Malfunction
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DESCRIPTION

This DTC is stored when the SSW1 contact signal and SSW2 contact signal, which are detected when the engine switch is operated, do not match.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2278 Engine/Power Switch Malfunction When the engine switch is operated, the SSW1 contact signal and SSW2 contact signal do not match (1-trip detection logic*).

  • Engine switch

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector
  • DTC Output Confirmation Operation:

  • Turn the engine switch on (IG).

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
If either the SSW1 contact signal or SSW2 contact signal is stuck on, the power source mode cannot be changed by pressing the engine switch. If either the SSW1 contact signal or SSW2 contact signal is stuck off, emergency stop by pressing and holding the engine switch for 2 seconds or more cannot be operated. -
Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2278
  • Power Source Control

  • Start Switch1

  • Start Switch2
Table 3. *a Engine Switch *b Certification ECU (Smart Key ECU Assembly)
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WIRING DIAGRAM

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

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  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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PROCEDURE


  1. Click here

    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.


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

        OFF: Engine switch not pressed

        ON: Engine switch pressed

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

        • Use this item to determine if the engine switch input signal is malfunctioning.
        Start Switch2 Engine switch 2 status OFF or ON

        OFF: Engine switch not pressed

        ON: Engine switch 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.




      1. Body Electrical > Power Source Control > Data List
        Tester Display
        Start Switch1
        Start Switch2





      OK
      The GTS display changes correctly in response to the engine switch operation.
      Result
      Proceed to
      OK
      NG

  2. Click here

    READ VALUE USING GTS (START SWITCH1, START SWITCH2)


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

    2. According to the display on the GTS, read the Data List while wiggling the wire harness.


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

        OFF: Engine switch not pressed

        ON: Engine switch pressed

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

        • Use this item to determine if the engine switch input signal is malfunctioning.
        Start Switch2 Engine switch 2 status OFF or ON

        OFF: Engine switch not pressed

        ON: Engine switch 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.




      1. Body Electrical > Power Source Control > Data List
        Tester Display
        Start Switch1
        Start Switch2





      OK
      The GTS display changes correctly in response to the engine switch operation.
      Result
      Proceed to
      OK
      NG

    • OK

      USE SIMULATION METHOD TO CHECKClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Disconnect the K62 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the K63 engine switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K62-23 (SSW1) - K63-5 (SS1) Always Below 1 Ω
      K62-21 (SSW2) - K63-1 (SS2) Always Below 1 Ω
      K62-11 (AGND) - K63-6 (AGND) Always Below 1 Ω
      K62-23 (SSW1) or K63-5 (SS1) - Other terminals and body ground Always 10 kΩ or higher
      K62-21 (SSW2) or K63-1 (SS2) - Other terminals and body ground Always 10 kΩ or higher
      K62-11 (AGND) or K63-6 (AGND) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    INSPECT ENGINE SWITCH


    1. Remove the engine switch.

      for A25A-FKS:Click here

      for 2GR-FKS:Click here

      for 2AR-FE:Click here

    2. Inspect the engine switch.

      for A25A-FKS:Click here

      for 2GR-FKS:Click here

      for 2AR-FE:Click here

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    • NG

      REPLACE ENGINE SWITCH for A25A-FKS:Click here

      REPLACE ENGINE SWITCH for 2GR-FKS:Click here

      REPLACE ENGINE SWITCH for 2AR-FE:Click here