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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 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 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*).

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)

  • Wire 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.

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 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 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.

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A0003HUE08
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle power switch off, connect the GTS to the vehicle 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 the 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 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.

  • 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.

Tip:
Table 2. Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2274
  • Power Source Control

  • ACC Relay Monitor

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the A72 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
      A72-2 (+B) - Body ground Power switch off 11 to 14 V
      Table 3. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS ORCONNECTOR IN CIRCUIT CONNECTED TOPOWER SOURCE

  2. Click here

    CHECK HARNESS AND CONNECTOR (GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A72-11 (E) - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Disconnect the H194 certification ECU (Smart key ECU assembly) connector.

    2. Disconnect the 3B instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H194-4 (ACCD) - 3B-23 Always Below 1 Ω
      3B-7 - Body ground Always Below 1 Ω
      H194-4 (ACCD) or 3B-23 - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY)


    1. A00063WE03

      Remove the instrument panel junction block assembly (Click here).

      Table 5. Text in Illustration
      *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
      Tester Connection Condition Specified Condition

      • 3E-1 - 3B-37*1

      • 3E-1 - 3A-32*1

      • 3F-1 - 3B-37*2

      • 3F-1 - 3B-32*2

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

      • *1: for LHD

      • *2: for RHD


  5. Click here

    INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the H194 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
      H194-4 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Table 6. Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

    • OK

      END (USE SIMULATION METHOD TO CHECK) (Click here)

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)