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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 between terminal ACCD of the certification ECU (smart key ECU assembly) and the ACC relay.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2274 ACC Monitor Malfunction

The ACC relay circuit of the certification ECU (smart key ECU assembly) is malfunctioning. (1-trip detection logic*)

Tip:

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

  • LUG-ACC relay

  • Driver side junction block assembly (ACC D relay)

  • Passenger side junction block assembly (ACC P relay)

  • Certification ECU (smart key ECU assembly)

  • Harness or connector
  • DTC Output Confirmation Operation:

  • 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 ACC 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 ACC 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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Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2274
  • Power Source Control

  • ACC Relay Monitor
Figure 2. for RHD: B004XITE14
Figure 1. for LHD:
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the power switch off, connect the GTS to the DLC3 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. 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 entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

  • Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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PROCEDURE


  1. Click here

    CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Proceed to
      for LHD
      for RHD

  2. Click here

    CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY), POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 5D driver side junction block assembly connectors.

    2. Disconnect the G71 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G71-16 (ACCD) - 5D-17 Always Below 1 Ω
      5D-6 - Body ground Always Below 1 Ω
      G71-16 (ACCD) or 5D-17 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5K-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B004TNWC13
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G71-16 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  4. Click here

    CHECK HARNESS AND CONNECTOR (LUG-ACC RELAY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY, POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 5H driver side junction block assembly connector.

    2. Remove the LUG-ACC relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5H-32 - LUG-ACC relay installation terminal 2 Always Below 1 Ω
      LUG-ACC relay installation terminal 1 - Body ground Always Below 1 Ω
      5H-32 or LUG-ACC relay installation terminal 2 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      LUG-ACC relay installation terminal 3 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK HARNESS AND CONNECTOR (PASSENGER SIDE JUNCTION BLOCK ASSEMBLY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY, POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 4D, 4A and 4K passenger side junction block assembly connectors.

    2. Disconnect the 5A driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-18 - 4D-26 Always Below 1 Ω
      4A-9 - Body ground Always Below 1 Ω
      5A-18 or 4D-26 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4K-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC D RELAY)


    1. Remove the driver side junction block assembly.

      Click here

    2. Reconnect the all driver side junction block assembly connectors.

    3. B004S7QC17
      *a

      Component with harness connected

      (Driver Side Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5D-22 - Body ground Power switch on (ACC) 11 to 14 V
      5A-18 - Body ground Power switch on (ACC) 8.5 to 14 V
      5H-32 - Body ground Power switch on (ACC) 8.5 to 14 V
      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK PASSENGER SIDE JUNCTION BLOCK ASSEMBLY (ACC P RELAY)


    1. Remove the passenger side junction block assembly.

      Click here

    2. Reconnect the all passenger side junction block assembly connectors.

    3. B004U0LC06
      *a

      Component with harness connected

      (Passenger Side Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4D-15 - Body ground Power switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

  8. Click here

    INSPECT LUG-ACC RELAY


    1. B004V52C15
      *1 LUG-ACC Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
      Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)Click here

    • NG

      REPLACE LUG-ACC RELAY

  9. Click here

    CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY), POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 5D and 5K driver side junction block assembly connectors.

    2. Disconnect the G71 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G71-16 (ACCD) - 5D-18 Always Below 1 Ω
      5D-7 - Body ground Always Below 1 Ω
      G71-16 (ACCD) or 5D-18 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5K-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B004TNWC13
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G71-16 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  11. Click here

    CHECK HARNESS AND CONNECTOR (PASSENGER SIDE JUNCTION BLOCK ASSEMBLY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY, POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 4D, 4A and 4K passenger side junction block assembly connectors.

    2. Disconnect the 5A driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-21 - 4D-32 Always Below 1 Ω
      4A-9 - Body ground Always Below 1 Ω
      5A-21 or 4D-32 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4K-1 - Body ground Power switch off 11 to 14 V

    5. Reconnect the 5D driver side junction block assembly connector.

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. Click here

    CHECK HARNESS AND CONNECTOR (LUG-ACC RELAY - PASSENGER SIDE JUNCTION BLOCK ASSEMBLY, POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 4H passenger side junction block assembly connector.

    2. Remove the LUG-ACC relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4H-21 - LUG-ACC relay installation terminal 2 Always Below 1 Ω
      LUG-ACC relay installation terminal 1 - Body ground Always Below 1 Ω
      4H-21 or LUG-ACC relay installation terminal 2 - Other terminals and body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      LUG-ACC relay installation terminal 3 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. Click here

    CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC D RELAY)


    1. Remove the driver side junction block assembly.

      Click here

    2. Reconnect the all driver side junction block assembly connectors.

    3. B004SIDC10
      *a

      Component with harness connected

      (Driver Side Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      5D-22 - Body ground Power switch on (ACC) 11 to 14 V
      5A-21 - Body ground Power switch on (ACC) 8.5 to 14 V
      Result
      Proceed to
      OK
      NG

  14. Click here

    CHECK PASSENGER SIDE JUNCTION BLOCK ASSEMBLY (ACC P RELAY)


    1. Remove the passenger side junction block assembly.

      Click here

    2. Reconnect the all passenger side junction block assembly connectors.

    3. B004SDRC16
      *a

      Component with harness connected

      (Passenger Side Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4D-28 - Body ground Power switch on (ACC) 11 to 14 V
      4H-21 - Body ground Power switch on (ACC) 8.5 to 14 V
      Result
      Proceed to
      OK
      NG

  15. Click here

    INSPECT LUG-ACC RELAY


    1. B004V52C15
      *1 LUG-ACC Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage applied between terminals 1 and 2 Below 1 Ω
      Auxiliary battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)Click here

    • NG

      REPLACE LUG-ACC RELAY