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 power management control ECU and the ACC relay is detected.

Tip:

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

  • 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.

Detection Item

DTC Detection Condition

Trouble Area

B2274

ACC Monitor Malfunction

Malfunction in the ACC relay activation circuit in the power management control ECU or the external circuit (1-trip detection logic*).

  • HINT

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

  • AM2 fuse

  • Driver side junction block assembly (ACC relay)

  • Power management control ECU

  • Harness or connector

  • *: Only output while a malfunction is present and the engine switch is on (IG)

DTC No.

DTC Output Confirmation Operation

B2274

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.

Tip:

To turn the engine switch on (ACC), carry the key and press the engine switch with the shift lever in P and the brake pedal released.
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 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).

Tip:

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

-

WIRING DIAGRAM

C223591E05

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.

Tip:
Table 2. Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2274

  • Power Source Control

  • ACC Relay Monitor

  • Starting Control

  • Ignition

-

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

    1. Disconnect the G39 power management control ECU connector.

    2. A207890C01

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G39-2 (AM21) - Body ground

      Always

      9.5 to 14 V

      G39-1 (AM22) - Body ground

      Result

      Result

      OK

      NG
    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

    1. A207890C02

      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G39-6 (GND) - Body ground

      Always

      Below 1 Ω

      G39-5 (GND2) - Body ground

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)

    1. B232807C01

      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      Disconnect the 2A and 2D driver side junction block assembly connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      2A-48 - 2D-4

      20°C (68°F)

      50.63 to 123.75 Ω

      Result

      Result

      OK

      NG
    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    OK

  4. CHECK HARNESS AND CONNECTOR (MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    1. Disconnect the 2A and 2D driver side junction block assembly connectors.

    2. Disconnect the G39 power management control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G39-19 (ACCD) - 2A-48

      Always

      Below 1 Ω

      2D-4 - Body ground

      Always

      Below 1 Ω

      G39-19 (ACCD) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU

    1. Connect the power management control ECU connectors.

      C182533C02

      *a

      Component with harness connected

      (Power Management Control ECU)

      -

      -

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      G39-19 (ACCD) - Body ground

      Engine switch off

      1 V or less

      Engine switch on (ACC)

      8.5 V or higher

      Result

      Result

      OK

      NG
    OK

    SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU

    Click here