LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2020 >> RC F Base >> Repair and Diagnosis >> Steering >> Steering Column >> Steering Lock System - Diagnostic Codes & Symptom Tests >> Steering Lock System >> DTC B2781: Open / Short in Steering Lock ECU [09/2014 - 01/2023] >> Caution / Notice / Hint
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Caution / Notice / Hint

NOTE:
  • When using the Techstream with the engine switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • After performing repairs, confirm that no DTCs are output again.

    Refer to DTC CHECK / CLEAR [09/2014 - 01/2023]

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

    Refer to REGISTRATION [09/2014 - 03/2019] , or refer to REGISTRATION [03/2019 - 09/2020] , or refer to REGISTRATION [09/2020 - 01/2023]

HINT: 

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