SMART ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2274

DTC Code DTC Name
B2274 ACC Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit that goes from the ACC output terminal of the certification ECU (smart key ECU assembly) to the ACC relay.

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.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2274

Malfunction in the ACC relay circuit in the certification ECU (smart key ECU assembly) or in the external circuit (1-trip detection logic*).

Tech Tips

When the voltage at terminal ACCD is not at the standard, the system is determined to be malfunctioning.

  • AM2 fuse

  • ACC relay (Instrument panel junction block assembly)

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

 Wait 10 seconds after turning the engine switch on (ACC) or on (IG), and then wait another 10 seconds after turning the engine switch off.

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected

  • If there is a malfunction due to the relay being stuck on, the ACC relay does not turn off even though the engine switch is off.

  • If there is a malfunction due to the relay being stuck off, the ACC relay does not turn on even though the engine switch is on (ACC).

Tech Tips

The engine switch can be turned on (IG) and the engine can be started.

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WIRING DIAGRAM

B000LMME01

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body / Entry & Start / DTC.

  • 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.

  • Before replacing the certification ECU (smart key ECU assembly), 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 performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Tech Tips

Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2274

    Power Source Control

  • ACC Relay Monitor


    Starting Control

  • Ignition

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PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    B000J85E07
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to Certification ECU (smart key ECU assembly))

    1. Disconnect the A43 connector from the certification ECU (smart key ECU assembly).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A43-2 (+B) - Body ground Always 11 to 14 V

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    B000J85E08
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to Certification ECU (smart key ECU assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-11 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the I78 connector from the certification ECU (smart key ECU assembly).

    2. Disconnect the 3B connector 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
      I78-4 (ACCD) - 3B-23 Always Below 1 Ω
      3B-7 - Body ground Always Below 1 Ω
      I78-4 (ACCD) or 3B-23 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. Remove the instrument panel junction block assembly Click here.

      B000H43E09
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly Click here.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition

      • 3E-1 - 3B-37

      • 3E-1 - 3A-32

      		 Battery voltage not applied to terminals 3B-23 and 3B-7 10 kΩ or higher
      Battery voltage applied to terminals 3B-23 and 3B-7 Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition

      • 3F-1 - 3B-37

      • 3F-1 - 3A-32

      		 Battery voltage not applied to terminals 3B-23 and 3B-7 10 kΩ or higher
      Battery voltage applied to terminals 3B-23 and 3B-7 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    B000LWHE04
    Text in Illustration
    *a

    Component with harness connected

    (Certification ECU (Smart Key ECU Assembly))

    1. Reconnect the I78 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
      I78-4 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    USE SIMULATION METHOD TO CHECK Click here