LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2007 >> Prius Base >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Occupant Classification System >> Diagnostic Trouble Code Chart
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Trouble Code Chart

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 SYSTEM: 

DIAGNOSTIC TROUBLE CODE CHART

DTC Code Detection Item Trouble Area
B1771  Passenger Side Buckle Switch Circuit Malfunction
  1. Floor wire
  2. Front seat inner belt assembly (Buckle switch RH)
  3. Occupant classification ECU
B1780  Front Occupant Classification Sensor LH Circuit Malfunction
  1. Front seat wire RH
  2. Front seat assembly RH (Front occupant classification sensor RH)
  3. Occupant classification ECU
B1781  Front Occupant Classification Sensor RH Circuit Malfunction
  1. Front seat wire RH
  2. Front seat assembly RH (Front occupant classification sensor RH)
  3. Occupant classification ECU
B1782  Rear Occupant Classification Sensor LH Circuit Malfunction
  1. Front seat wire RH
  2. Front seat assembly RH (Rear occupant classification sensor LH)
  3. Occupant classification ECU
B1783  Rear Occupant Classification Sensor RH Circuit Malfunction
  1. Front seat wire RH
  2. Front seat assembly RH (Rear occupant classification sensor RH)
  3. Occupant classification ECU
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. Floor wire No. 2
  2. Occupant classification ECU
  3. Center airbag sensor assembly
B1793  Occupant Classification Sensor Power Supply Circuit Malfunction
  1. Front seat wire RH
  2. Front seat assembly RH (Occupant classification sensors)
  3. Occupant classification ECU
B1794  Open in Occupant Classification ECU Battery Positive Line
  1. Wire harness
  2. Occupant classification ECU
B1795  Occupant Classification ECU Malfunction
  1. Battery
  2. ECU-B Fuse
  3. Floor wire No. 2
  4. Front seat inner belt RH
  5. Occupant classification ECU
B1796  Sleep Operation Failure of Occupant Classification ECU Occupant classification ECU
scientia non olet · About LEMON Manuals