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 fuse

  • MAIN 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*2 or N*3 and the brake pedal*2, *3 or clutch pedal*4 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 when the relay is off, the ACC relay does not turn on even though the power source mode is on (ACC).

Tech Tips

The power source can change to on (IG) and the engine can be started.

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WIRING DIAGRAM

A005KRNE05

CAUTION / NOTICE / HINT

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 and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

  • 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.

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

  • When the power source mode cannot change to on (ACC), the audio and navigation systems do not operate.

  • 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 No. 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)

    A005GV2E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the F65 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
      F65-2 (+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)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F65-11 (E) - 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 F63 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 (Check for Open)
      Tester Connection Condition Specified Condition
      F63-4 (ACCD) - 3B-37 Always Below 1 Ω
      3B-8 - Body ground Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F63-4 (ACCD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

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

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

      A005HIAE01
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3E-1 - MB-29 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3B-37 and 3B-8 Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3F-1 - MB-29 When battery voltage absent 10 kΩ or higher
      When battery voltage is applied to terminals 3B-37 and 3B-8 Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

    2. Install the instrument panel junction block assembly.

    3. A005HXCE01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the F63 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
      F63-4 (ACCD) - Body ground Engine switch off 1 V or less
      Engine switch on (ACC) 8.5 V or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)