2017 Lexus ES 300hFACTORY OEM SERVICE PROCEDURE

Occupant Classification System

OCCUPANT CLASSIFICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Code Detection Item Refer To
B1771 Passenger Side Buckle Switch Circuit Malfunction Refer to DTC B1771: Passenger Side Buckle Switch Circuit Malfunction [07/2015 - ]
B1782 Rear Occupant Classification Sensor LH Circuit Malfunction Refer to DTC B1782: Rear Occupant Classification Sensor LH Circuit Malfunction [07/2015 - ]
B1783 Rear Occupant Classification Sensor RH Circuit Malfunction Refer to DTC B1783: Rear Occupant Classification Sensor RH Circuit Malfunction [07/2015 - ]
B1787 Rear Occupant Classification Sensor LH Collision Detection Refer to DTC B1787: Rear Occupant Classification Sensor LH Collision Detection [07/2015 - ]
B1788 Rear Occupant Classification Sensor RH Collision Detection Refer to DTC B1788: Rear Occupant Classification Sensor RH Collision Detection [07/2015 - ]
B1790 Center Airbag Sensor Assembly Communication Circuit Malfunction Refer to DTC B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction [07/2015 - ]
B1793 Occupant Classification Sensor Power Supply Circuit Malfunction Refer to DTC B1793: Occupant Classification Sensor Power Supply Circuit Malfunction [07/2015 - ]
B1794 Open in Occupant Classification ECU Battery Positive Line Refer to DTC B1794: Open in Occupant Classification ECU Battery Positive Line [07/2015 - ]
B1795 Occupant Classification ECU Malfunction Refer to DTC B1795: Occupant Classification ECU Malfunction [07/2015 - ]
B1796 Sleep Operation Failure of Occupant Classification ECU Refer to DTC B1796: Sleep Operation Failure of Occupant Classification ECU [07/2015 - ]
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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