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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
  1. If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below (proceed to the page listed for that circuit). 

    Occupant Classification ECU 

    OCCUPANT CLASSIFICATION ECU DIAGNOSTIC TROUBLE CODE CHART

    DTC No. Detection Item Trouble Area
    B1771  Passenger Side Buckle Switch Circuit Malfunction
    1. Front seat inner belt assembly (Buckle switch RH)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1780  Front Occupant Classification Sensor LH Circuit Malfunction
    1. Front seat assembly RH (Front occupant classification sensor LH)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1781  Front Occupant Classification Sensor RH Circuit Malfunction
    1. Front seat assembly RH (Front occupant classification sensor RH)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1782  Rear Occupant Classification Sensor LH Circuit Malfunction
    1. Front seat assembly RH (Rear occupant classification sensor LH)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1783  Rear Occupant Classification Sensor RH Circuit Malfunction
    1. Front seat assembly RH (Front occupant classification sensor RH)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1785  Front Occupant Classification Sensor LH Collision Detection
    1. Front seat assembly RH (Front occupant classification sensor LH)
    2. Occupant classification ECU
    B1786  Front Occupant Classification Sensor RH Collision Detection
    1. Front seat assembly RH (Front occupant classification sensor RH)
    2. Occupant classification ECU
    B1787  Rear Occupant Classification Sensor LH Collision Detection
    1. Front seat assembly RH (Rear occupant classification sensor LH)
    2. Occupant classification ECU
    B1788  Rear Occupant Classification Sensor RH Collision Detection
    1. Front seat assembly RH (Rear occupant classification sensor RH)
    2. Occupant classification ECU
    B1790  Center Airbag Sensor Assembly Communication Circuit Malfunction
    1. Occupant classification ECU
    2. Center airbag sensor assembly
    3. Floor wire
    4. Front seat wire RH
    B1793  Occupant Classification Sensor Power Supply Circuit Malfunction
    1. Front seat assembly RH (Occupant classification sensors)
    2. Occupant classification ECU
    3. Front seat wire RH
    B1795  Occupant Classification ECU Malfunction
    1. Battery
    2. ECU-B Fuse
    3. Floor wire
    4. Front seat wire RH
    5. Front seat inner belt assembly RH (Buckle switch RH)
    6. Occupant classification ECU
    B1796  Sleep Operation Failure of Occupant Classification ECU 1. Occupant classification ECU
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