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Home >> Lexus >> 2019 >> LS 500 Base, RWD >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (4 Of 4) & Symptom Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0076-88: Control Module Communication Bus "D" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0130-87: Lost Communication with Steering Effort Control Module Missing Message; DTC U0134-87: Lost Communication with Power Steering Control Module Rear Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U1106-87: Lost Communication with Electric Parking Brake Module Missing Message [09/2018 - 10/2023] >> Procedure
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DTC U0074-88: Control Module Communication Bus "B" Off Bus Off; DTC U0076-88: Control Module Communication Bus "D" Off Bus Off; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0130-87: Lost Communication with Steering Effort Control Module Missing Message; DTC U0134-87: Lost Communication with Power Steering Control Module Rear Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U1106-87: Lost Communication with Electric Parking Brake Module Missing Message [09/2018 - 10/2023]: Procedure

  1. RECONFIRM DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

      Chassis > Brake > Clear DTCs 

    2. Turn the engine switch off.
    3. Turn the engine switch on (IG).
    4. Check for DTCs.

      Refer to DIAGNOSIS SYSTEM [09/2018 - 09/2019] , or refer to DIAGNOSIS SYSTEM [09/2019 - 10/2020] , or refer to DIAGNOSIS SYSTEM [10/2020 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023]

      Chassis > Brake > Trouble Codes 

      HINT: 

      If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for electronically controlled brake system) after the CAN communication system returns to normal.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2023]

      Result

      Result Proceed to
      DTC (relating to CAN communication system) is output A
      DTC is not output B

    Result: 

    CHECK CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023] 

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]