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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Variable Gear Ratio Steering System - Diagnostic Codes & Symptom Tests (Coupe) >> Variable Gear Ratio Steering System >> DTC U0100-56: Lost Communication with ECM / PCM "A"; DTC U0101-56: Lost Communication with TCM; DTC U0125-56: Lost Communication with Yaw Rate Sensor Module; DTC U0126-56: Lost Communication with Steering Angle Sensor Module; DTC U0129-56: Lost Communication with Brake System Control Module; DTC U0131-56: Lost Communication with Power Steering Control Module; DTC U0134-56: Lost Communication with DRS Module [03/2017 - 09/2018] >> Procedure
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DTC U0100-56: Lost Communication with ECM / PCM "A"; DTC U0101-56: Lost Communication with TCM; DTC U0125-56: Lost Communication with Yaw Rate Sensor Module; DTC U0126-56: Lost Communication with Steering Angle Sensor Module; DTC U0129-56: Lost Communication with Brake System Control Module; DTC U0131-56: Lost Communication with Power Steering Control Module; DTC U0134-56: Lost Communication with DRS Module [03/2017 - 09/2018]: Procedure

  1. CHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > VGRS > Clear DTCs 

    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > VGRS > Trouble Codes 

      Result

      Result Proceed to
      DTC U0100/56, U0101/56, U0125/56, U0126/56, U0129/56, U0131/56 and U0134/56 are not output A
      DTC U0100/56, U0101/56, U0125/56, U0126/56, U0129/56, U0131/56 or U0134/56 is output B

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 09/2018]