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HOMESERVICE MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL RESTRAINT SYSTEMOCCUPANT CLASSIFICATION SYSTEMDIAGNOSTIC TROUBLE CODE CHART
2009 Toyota Yaris S, 4D Hatchback

Diagnostic Trouble Code Chart

2009 Toyota Yaris S, 4D HatchbackSECTION 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.

Occupant Classification ECU 

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 LH)
  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
  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. Occupant classification ECU
B1796  Sleep Operation Failure of Occupant Classification ECU
  1. Occupant classification ECU
RENDER: 1.0x

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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.