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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Electronically Controlled Brake System (Diagnostic Codes) (7 Of 7) & Symptom Tests) >> Electronically Controlled Brake System >> DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0128: Lost Communication With EPB Module; DTC U0140: Lost Communication with Body Control Module; DTC U0151: Lost Communication With Restraints Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [08/2019 - ] >> Procedure
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DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0128: Lost Communication With EPB Module; DTC U0140: Lost Communication with Body Control Module; DTC U0151: Lost Communication With Restraints Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [08/2019 - ]: Procedure

  1. CHECK DTC (HEALTH CHECK) 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [08/2019 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Turn the power switch on (IG).
    4. Enter the following menus: System Select / Health Check.
    5. Check for DTCs.

      Result

      Result Proceed to
      DTCs for related systems are output together with DTC U0073, U0100, U0120, U0123, U0124, U0126, U0128, U0140, U0151 or U0293. A
      DTC U0073, U0100, U0120, U0123, U0124, U0126, U0128, U0140, U0151 or U0293 is output. B
      DTCs are not output. C

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (RELATED SYSTEM) 

    Result: 

    INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ]