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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Lin Communication System (Hybrid) - Diagnostic Codes) >> LIN COMMUNICATION SYSTEM (for HV Model) >> DTC B2786: No Response from Steering Lock ECU [06/2018 - 09/2022] >> Procedure

DTC B2786: No Response from Steering Lock ECU [06/2018 - 09/2022]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)) 
    1. Disconnect the G47 certification ECU (smart key ECU assembly) connector.
    2. Disconnect the G51 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.
      NOTE:

      Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the power switch from on (IG) to off and wait for 180 seconds or more without operating any switches.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G47-13 (LIN) - G51-5 (LIN) Power switch off Below 1 Ω
      G47-13 (LIN) or G51-5 (LIN) - Body ground Power switch off 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) - AUXILIARY BATTERY, BODY GROUND) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G51-7 (B) - G51-1 (GND) Power switch off 11 to 14 V
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G51-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) 
    1. Replace the steering lock ECU (steering lock actuator or upper bracket assembly).

      Refer to DISASSEMBLY [06/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. REGISTER ECU CODE REGISTRATION 
    1. Register the recognition codes in the ECUs.

      Refer to REGISTRATION [06/2018 - 10/2019] , or refer to REGISTRATION [10/2019 - 09/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK FOR DTC 
    1. Clear the DTCs.

      Body Electrical > Smart Access > Clear DTCs 

    2. Recheck for DTCs.

      Body Electrical > Smart Access > Trouble Codes 

      OK

      DTC B2786 is not output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

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