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ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2781

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DTC Code DTC Name
B2781 Open / Short in Steering Lock ECU
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DESCRIPTION

The steering lock ECU and steering lock motor are built into the steering lock actuator or upper bracket assembly.

The steering lock ECU (steering lock actuator or upper bracket assembly) detects whether the steering lock is in the lock or unlock position by using the lock sensor and unlock sensor of the steering lock motor.

The steering lock ECU (steering lock actuator or upper bracket assembly) receives lock and unlock request signals from the certification ECU (smart key ECU assembly) and responds with lock and unlock operation signals.

The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2781 Open / Short in Steering Lock ECU

One of the following conditions is met (1-trip detection logic (Only output while a malfunction is present and the power switch is on (IG).)):


  • The steering lock sensor or unlock sensor is malfunctioning (When both detection switches turn on, the system is determined to be malfunctioning).

  • The steering lock motor activation circuit has a short circuit.

  • The steering lock motor activation circuit has an open circuit.

  • Steering lock ECU (steering lock actuator or upper bracket assembly)

  • LIN communication system
  • DTC Output Confirmation Operation:

  • Any time
Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The steering cannot be locked or unlocked. For this reason, the hybrid control system cannot be started. Prohibits the hybrid control system off from being started.
Table 2. Related Data List and Active Test Items
DTC No. Data List and Active Test
B2781
  • Entry&Start

  • Sensor Value

  • Motor Driver Short
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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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  • Before replacing the steering lock ECU (steering lock actuator or upper bracket assembly), refer to the Service Bulletin.

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

Tip:

When all the ECUs that are connected via LIN communication cannot communicate with the certification ECU (smart key ECU assembly), DTC B2785 is stored.

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PROCEDURE


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    CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Entry&Start / Trouble Codes.

    5. Check for DTCs.


      1. Body Electrical > Entry&Start > Trouble Codes


      Tip:

      • If the steering cannot be unlocked, the power switch cannot be turned on (IG) and the hybrid control system cannot be started.

      • If LIN communication is not available, the steering cannot be locked or unlocked.

      Result
      Result Proceed to
      DTC B2785 is not output. A
      DTC B2785 is output. B

    • A

      REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)Click here

    • B

      GO TO LIN COMMUNICATION SYSTEM (DTC B2785)Click here