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.

Tip:

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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2274

ACC Monitor Malfunction

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

Tip:

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)

  • Harness or connector

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

*: Only detected while a malfunction is present.

Table 1. 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 ACC relay being stuck on, the ACC relay does not turn off even though the power switch is off.

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

Tip:

The power switch can be turned on (IG) and the hybrid control system can be started.

-
Table 2. Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2274

  • Power Source Control:

  • ACC Relay Monitor

-

WIRING DIAGRAM

C348557E02

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • The 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 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 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.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    1. B268625C36

      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the G82 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

      G82-2 (+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

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    1. B268625C38

      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the G82 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

      G82-11 (E) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    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 G84 connector from the certification ECU (smart key ECU assembly).

    2. Disconnect the 3C and 3D connectors 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

      G84-4 (ACCD) - 3C-45

      Always

      Below 1 Ω

      3D-9 - Body ground

      G84-4 (ACCD) or 3C-45 - Body ground

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    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.

      C278638C01

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      -

      -

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3A-1 - 3D-50

      Auxiliary battery voltage not applied to terminals 3C-45 and 3D-9

      10 kΩ or higher

      Auxiliary battery voltage applied to terminals 3C-45 and 3D-9

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    1. B268626C07

      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the G84 certification ECU (smart key ECU assembly) connector

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G84-4 (ACCD) - Body ground

      Power switch off → Power switch on (ACC)

      1 V or less → 8.5 V or higher

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)