STEERING LOCK SYSTEM, Diagnostic DTC:B2781

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

DESCRIPTION

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

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

Tech Tips

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU 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 engine 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 assembly)

  • LIN communication system

 No confirmation operation is necessary (monitoring is continuous).
B003LTME01
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 engine cannot be started. Prohibits the engine from being started (the engine does not crank).
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2781

    Entry&Start

  • Sensor Value

  • Motor Driver Short

 -

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle engine switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). 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 steering lock system uses LIN 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

  • After performing repairs, confirm that no DTCs are output again.

    Click here

  • When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed (refer to Service Bulletin).

Tech Tips

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

PROCEDURE


  1. CHECK DTC


    1. Using the GTS, check if LIN communication DTC B2785 is output.

      Tech Tips

      If a LIN communication DTC is output, perform troubleshooting for the LIN communication system.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Result Proceed to
      DTC B2785 is output. A
      DTC B2785 is not output. B

    A

    GO TO LIN COMMUNICATION SYSTEM (DTC B2785) Click here

    B

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here