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SMART ENTRY AND START SYSTEM, Diagnostic DTC:B2278

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DTC Code DTC Name
B2278 Engine Switch Circuit Malfunction
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DESCRIPTION

This DTC is output if 1) a malfunction is detected between the main body ECU and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.

Tip:

If the main body ECU is replaced with a new one while the negative (-) battery terminal is connected, the power source mode will be in IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU is replaced, perform the registration procedure for the engine immobiliser system.

DTC No. DTC Detection Condition Trouble Area
B2278 Communication is abnormal between the main body ECU and engine switch or the engine switch is defective

  • Engine switch

  • Main body ECU (Instrument panel junction block)

  • Wire harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (START SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Check the DATA LIST for proper functioning of the start switch.

      Tip:

      When using the intelligent tester with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the tester and vehicle starts.

      Table 1. Body:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      St SW1 Start Switch 1 / ON or OFF

      ON: Engine switch is pushed

      OFF: Engine switch is not pushed

      		 -
      St SW2 Start Switch 2 / ON or OFF

      ON: Engine switch is pushed

      OFF: Engine switch is not pushed

      		 -
      OK
      ON (engine switch is pushed) and OFF (engine switch is not pushed) appear on the screen.

  2. Click here

    INSPECT ENGINE SWITCH


    1. A017BKJE01

      Remove the engine switch (Click here).

    2. Disconnect the switch connector.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      7 (SS1) - 5 (GND) Pushed Below 1 Ω
      2 (SS2) - 5 (GND) Pushed Below 1 Ω
      7 (SS1) - 5 (GND) Not pushed 10 kΩ or higher
      2 (SS2) - 5 (GND) Not pushed 10 kΩ or higher
      Tip:

      This switch is a momentary type switch.


  3. Click here

    CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND)


    1. A017BRUE03

      Disconnect the D7 ECU connector.

    2. Disconnect the D22 switch connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D22-7 (SS1) - D7-17 (SSW1) Always Below 1 Ω
      D22-2 (SS2) - D7-16 (SSW2) Always Below 1 Ω
      D22-5 (GND) - Body ground Always Below 1 Ω
      D22-7 (SS1) or D7-17 (SSW1) - Body ground Always 10 kΩ or higher
      D22-2 (SS2) or D7-16 (SSW2) - Body ground Always 10 kΩ or higher

  4. Click here

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

  5. Click here

    REPLACE ENGINE SWITCHClick here

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR