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

DTC Code DTC Name
B2278 Engine/Power Switch Malfunction

DESCRIPTION

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

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

  • AM2 fuse

  • Power switch

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

    DTC Output Confirmation Operation:

  • Turn the power switch on (IG).

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 power switch. If either the SSW1 contact signal or SSW2 contact signal is stuck off, emergency stop by pressing and holding the power switch for 2 seconds or more cannot be operated. -
Related Data List and Active Test Items
DTC No. Data List and Active Test
B2278

    Power Source Control

  • Starter Switch1

  • Starter Switch2

WIRING DIAGRAM

A003LFQE11

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

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

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

    Click here

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

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. 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 if 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 power source mode can only be changed 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

    NG

    CHECK HARNESS AND CONNECTOR (POWER SOURCE) Click here

    OK

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


      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 if 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 power source mode can only be changed 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

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    Result
    Proceed to
    OK
    NG

    1. A003LHRC26
      *a

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the I1 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
      I1-4 (+B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GROUND)

    Result
    Proceed to
    OK
    NG

    1. A003LHRC27
      *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
      I1-18 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the I53 power switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-23 (SSW1) - I53-5 (SS1) Always Below 1 Ω
      I1-21 (SSW2) - I53-1 (SS2) Always Below 1 Ω
      I1-11 (AGND) - I53-6 (AGND) Always Below 1 Ω
      I1-23 (SSW1) or I53-5 (SS1) - Body ground Always 10 kΩ or higher
      I1-21 (SSW2) or I53-1 (SS2) - Body ground Always 10 kΩ or higher
      I1-11 (AGND) or I53-6 (AGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT POWER SWITCH


    1. Remove the power switch.

      Click here

    2. Inspect the power switch.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPLACE POWER SWITCH Click here