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

DTC Code DTC Name
B2274 ACC Monitor Malfunction

DESCRIPTION

This DTC is stored when there is a problem in the ACC output circuit. The ACC circuit is the circuit that goes from inside the certification ECU (smart key ECU assembly) to the ACC relay.

Tech Tips


  • When the certification ECU (smart key ECU assembly) is replaced with a new one and the cable is connected to the negative (-) auxiliary battery terminal, the power source mode changes to on (IG).

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

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.

DTC Code 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*).

Tech Tips

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

  • ECU-B2 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.

Tech Tips

To turn the power switch on (ACC), carry the key and press the power switch with park (P) selected and the brake pedal released.

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 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 hybrid control system can be started.

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WIRING DIAGRAM

B005YMVE22
B005YMVE24

CAUTION / NOTICE / HINT

Note


  • 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 for 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 Data List Item Active Test Item
B2274

    Power Source Control

  • ACC Relay Monitor

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PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the L195 certification ECU (smart key ECU assembly) connector.

    2. B005XWEE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to 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
      L195-2 (+B) - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)


    1. B005Z0KE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L195-11 (E) - Body ground Always Below 1 Ω

    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 L197 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 2A and 2B 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
      L197-4 (ACCD) - 2A-25 Always Below 1 Ω
      2B-9 - Body ground Always Below 1 Ω
      L197-4 (ACCD) or 2A-25 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ACC RELAY)


    1. Remove the instrument panel junction block assembly.

      B005XROE02
      Text in Illustration
      *A for LHD *B for RHD
      *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

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      2E-1 - 2B-13*1

      2F-1 - 2B-13*2

      		 Auxiliary battery voltage not applied between terminals 2A-25 and 2B-9 10 kΩ or higher
      Auxiliary battery voltage applied between terminals 2A-25 and 2B-9 Below 1 Ω

      • *1: for LHD

      • *2: for RHD


    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B005ZRJE02
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the L197 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
      L197-4 (ACCD) - Body ground Power switch off → Power switch on (ACC)) 1 V or less → 8.5 V or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)