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

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DTC Code DTC Name
B2274 ACC Monitor Malfunction
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DESCRIPTION

This DTC is stored when a malfunction in the ACC output circuit is detected. The ACC output circuit is the circuit between terminal ACCD of the certification ECU (smart key ECU assembly) and the ACC relay.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2274 ACC Monitor Malfunction

The ACC relay circuit of the certification ECU (smart key ECU assembly) is malfunctioning. (1-trip detection logic*)

Tip:

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

  • Instrument panel junction block assembly

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector
  • DTC Output Confirmation Operation:

  • 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.

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 engine 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 engine switch is on (ACC).

Tip:

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

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Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2274
  • Power Source Control

  • ACC Relay Monitor


  • Starting Control

  • Ignition
Table 3. *a Instrument Panel Junction Block Assembly *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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  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • 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


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


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

    2. Disconnect the 3A, 3B and 3F instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K62-16 (ACCD) - 3A-30 Always Below 1 Ω
      3B-3 - Body ground Always Below 1 Ω
      K62-16 (ACCD) or 3A-30 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3F-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. Remove the instrument panel junction block assembly.

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    2. Connect all of the instrument panel junction block assembly connectors.

    3. Connect the K62 certification ECU (smart key ECU assembly) connector.

    4. B007108C14
      *a

      Component with harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3D-26 - Body ground Engine switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B0070P9C60
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K62-16 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    • OK

      END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)Click here

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)