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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Blind Spot Monitor System - Diagnostic Codes & Circuit Tests >> Blind Spot Monitor System >> DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message; DTC U114F-87: Lost Communication with Power Integration Module Missing Message [10/2023 - ] >> Procedure
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DTC U0100-87: Lost Communication With ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0131-87: Lost Communication with Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0163-87: Lost Communication with Navigation Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message; DTC U114F-87: Lost Communication with Power Integration Module Missing Message [10/2023 - ]: Procedure

  1. CHECK DTC 
    1. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Blind Spot Monitor "B" > Trouble Codes 

      Result

      Result Proceed to
      U0100-87, U0129-87, U0131-87, U0140-87, U0163-87, U0293-87, U114F-87 and U0232-87 are output A
      U0100-87, U0129-87, U0131-87, U0140-87, U0163-87, U0293-87 or U114F-87 is output B
      DTCs are not output C
      None of the above conditions are met D

      HINT: 

      • If CAN communication system DTCs are stored, they may also be stored for other systems.
      • If the CAN communication system has been inspected and repaired, the DTCs will not be output when rechecking for DTCs.
      • If these DTCs are output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even if the DTCs were not output when rechecking for DTCs.

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

    Result: 

    GO TO DTC U0232-87. Refer to  DTC U0232-87: Lost Communication with Side Obstacle Detection Control Module "A" Missing Message [10/2023 - ]  

    Result: 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ]