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Home >> Lexus >> 2013 >> GS 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Transfer Case (Diagnostic Codes & Symptom Tests) >> Four Wheel Drive Control System >> DTC U0073/86: Control Module Communication Bus OFF; DTC U0100/85: Lost Communication with ECM / PCM "A"; DTC U0126/84: Lost Communication with Steering Angle Sensor Module; DTC U0129/83: Lost Communication with Brake System Control Module >> Procedure

DTC U0073/86: Control Module Communication Bus OFF; DTC U0100/85: Lost Communication with ECM / PCM "A"; DTC U0126/84: Lost Communication with Steering Angle Sensor Module; DTC U0129/83: Lost Communication with Brake System Control Module: Procedure

  1. CHECK DTC 
    1. Check DTC. Refer to DTC CHECK / CLEAR [12/2011 - ] .
    2. Record the output DTC (4WD control system).

      HINT: 

      When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

    NEXT → See step   2 

  2. GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2011 - ]