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 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*)

Tech Tips

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.

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).

Tech Tips

The power switch can be turned on (IG) and the hybrid control system can be started.

 -
Related Data List and Active Test Items
DTC No. Data List and Active Test
B2274

    Power Source Control

  • ACC Relay Monitor

WIRING DIAGRAM

Figure 1. for LHD:

B004A0TE03

Figure 2. for RHD:

B004B47E02

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.

    Click here

  • 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".

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Proceed to
      for LHD
      for RHD

    for RHD

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

    for LHD

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


    1. Disconnect the 3B and 3F driver side junction block assembly connectors.

    2. Disconnect the P66 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
      P66-16 (ACCD) - 3B-17 Always Below 1 Ω
      3B-6 - Body ground Always Below 1 Ω
      P66-16 (ACCD) or 3B-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
      3F-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B004C79C65
      *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
      P66-16 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

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


    1. Remove the LUG-ACC relay.

    2. Disconnect the 3D 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
      3D-32 - LUG-ACC relay installation terminal 1 Always Below 1 Ω
      LUG-ACC relay installation terminal 2 - Body ground Always Below 1 Ω
      3D-32 or LUG-ACC relay installation terminal 1 - 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the 4B, 4A and 4F passenger side junction block assembly connectors.

    2. Disconnect the 3A 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
      3A-18 - 4B-26 Always Below 1 Ω
      4A-9 - Body ground Always Below 1 Ω
      3A-18 or 4B-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
      4F-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC D RELAY)


    1. Remove the driver side junction block assembly.

      Click here

    2. Reconnect the driver side junction block assembly connectors.

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

      B004ANYC01
      *a

      Component with harness connected

      (Driver Side Junction Block Assembly)

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-43 - Body ground Power switch on (ACC) 11 to 14 V
      3A-18 - Body ground Power switch on (ACC) 8.5 to 14 V
      3D-32 - Body ground Power switch on (ACC) 8.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    OK

  7. CHECK PASSENGER SIDE JUNCTION BLOCK ASSEMBLY (ACC P RELAY)


    1. Remove the passenger side junction block assembly.

      Click here

    2. Reconnect the passenger side junction block assembly connectors.

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

      B0049UQC01
      *a

      Component with harness connected

      (Passenger Side Junction Block Assembly)

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4B-27 - Body ground Power switch on (ACC) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PASSENGER SIDE JUNCTION BLOCK ASSEMBLY Click here

    OK

  8. INSPECT LUG-ACC RELAY


    1. B004BGCC01
      *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. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY), POWER SUPPLY AND BODY GROUND)


    1. Disconnect the 3B and 3F driver side junction block assembly connectors.

    2. Disconnect the P66 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
      P66-16 (ACCD) - 3B-18 Always Below 1 Ω
      3B-7 - Body ground Always Below 1 Ω
      P66-16 (ACCD) or 3B-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
      3F-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B004C79C65
      *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
      P66-16 (ACCD) - Body ground Power switch off → Power switch on (ACC) 1 V or less → 8.5 V or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

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


    1. Disconnect the 4B, 4A and 4F passenger side junction block assembly connectors.

    2. Disconnect the 3A 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
      3A-21 - 4B-32 Always Below 1 Ω
      4A-9 - Body ground Always Below 1 Ω
      3A-21 or 4B-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
      4F-1 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the 4D 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
      4D-21 - LUG-ACC relay installation terminal 1 Always Below 1 Ω
      LUG-ACC relay installation terminal 2 - Body ground Always Below 1 Ω
      4D-21 or LUG-ACC relay installation terminal 1 - 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC D RELAY)


    1. Remove the driver side junction block assembly.

      Click here

    2. Reconnect the driver side junction block assembly connectors.

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

      B004ANYC01
      *a

      Component with harness connected

      (Driver Side Junction Block Assembly)

      		 - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-43 - Body ground Power switch on (ACC) 11 to 14 V
      3A-21 - Body ground Power switch on (ACC) 8.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    OK

  14. CHECK PASSENGER SIDE JUNCTION BLOCK ASSEMBLY (ACC P RELAY)


    1. Remove the passenger side junction block assembly.

      Click here

    2. Reconnect the passenger side junction block assembly connectors.

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

      B0049UPC06
      *a

      Component with harness connected

      (Passenger Side Junction Block Assembly)

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

    NG

    REPLACE PASSENGER SIDE JUNCTION BLOCK ASSEMBLY Click here

    OK

  15. INSPECT LUG-ACC RELAY


    1. B004BGCC01
      *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