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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Electrical >> Starter >> Starting >> Smart Access System With Push-Button Start >> DTC B2287 LIN Communication Master Malfunction >> Inspection Procedure
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Inspection Procedure

  1. CHECK FOR DTCS 
    1. Delete the DTCs (See DTC CHECK / CLEAR  ).
    2. Check for DTC B2287 (LIN communication master malfunction) and B2785 (Communication malfunction between ECUs connected by LIN).

      Result 

      RESULT REFERENCE

      Display (DTC output) Proceed to
      "DTC B2287" only A
      "DTC B2287" and "DTC B2785" B
      No DTC C

      HINT:

      If DTC B2785 is output, perform troubleshooting for DTC B2785 first (See DTC B2785 COMMUNICATION MALFUNCTION BETWEEN ECUS CONNECTED BY LIN ).

    B:  GO TO DTC B2785

    C: CHECK INTERMITTENT PROBLEMS 

    A: Go to Next Step 

  2. CHECK WIRE HARNESS (MAIN BODY ECU - CERTIFICATION ECU) 
    1. Disconnect the E13 and DR ECU connectors.
      Fig 1: Disconnecting E13 Certification ECU Connector
      G05248864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      DR-9 (LIN1) - E13-10 (LIN) Always Below 1 Ω
      DR-9 (LIN1) or E13-10 (LIN) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  3. CHECK MAIN BODY ECU OPERATION 
    1. After replacing the main body ECU with a normally functioning ECU, check that the engine starts.

      OK: Engine can start normally. 

    NG: REPLACE CERTIFICATION ECU 

    OK: REPLACE END (MAIN BODY ECU DEFECTIVE) 

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