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 between the ACC output terminal of the certification ECU (smart key ECU assembly) and the ACC relay is detected.

Tech Tips

When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2274

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

Tech Tips

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

  • AM2 No. 2 fuse

  • Instrument panel junction block assembly (ACC relay)

  • 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.

Tech Tips

To turn the engine switch on (ACC), carry the key and press the engine switch with the shift lever in P or N*2 and the brake pedal*2 or clutch pedal*3 released.

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

  • If there is a malfunction when the relay is stuck on, the ACC relay does not turn off even though all the power 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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Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2274

    Power Source Control

  • ACC Relay Monitor


    Engine

  • Ignition Status

 -

WIRING DIAGRAM

A004HTLE03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine 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 uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A004IP3E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the D48 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
      D48-2 (+B) - Body ground Always 9.5 to 16 V

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    A004KBGE01
    Text in Illustration
    *a

    Rear view of harness connected

    (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
      D48-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the D41 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3A 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
      D41-4 (ACCD) - 3A-20 Always Below 1 Ω
      3A-12 - Body ground Always Below 1 Ω
      D41-4 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC1, ACC2 RELAY)


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

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

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

      A004ISTE02
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3E-1 - 3B-28 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3A-20 and 3A-12 Below 1 Ω
      3E-1 - 3A-10 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3A-20 and 3A-12 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Install the main body ECU (network gateway ECU) to the instrument panel junction block assembly Click here.

    2. Install the instrument panel junction block assembly.

    3. A004JOUE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the D41 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D41-4 (ACCD) - Body ground Engine switch off → Engine switch on (ACC) Below 1 V → 8.5 V or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)