2017 Subaru BRZ Limited, Automatic TransFACTORY OEM SERVICE PROCEDURE

Occupant Detection System DTCS

OCCUPANT DETECTION SYSTEM DIAGNOSTIC TROUBLE CODE IDENTIFICATION

DTC Item Diagnosis contents Reference
B1650 Occupant classification system malfunction
  • Occupant detection sensor is faulty.
  • Occupant detection control module is faulty.
  • Occupant detection harness is faulty.
  • Rear airbag harness RH is faulty.
  • A/B MAIN fuse (15 A) is blown.
 DTC B1650 Occupant classification system malfunction
B1655 Front Buckle Switch RH Failure
  • The buckle switch RH circuit is open, shorted, or short-circuited to ground.
  • Occupant detection system is faulty.
  • Occupant detection harness is faulty.
 DTC B1655 Front Buckle Switch RH Failure
B1760 Sensor mat abnormal
  • Occupant detection sensor is faulty.
  • Open circuit in the occupant detection sensor, short between terminals, shorted to power supply, and shorted to ground.
  • Open circuit in seat heater.
  • Occupant detection control module is faulty.
 DTC B1760 Sensor mat abnormal
B1761 Sensor mat liquid coating abnormal
  • Liquid coating abnormality is detected in occupant detection sensor.
  • Occupant detection sensor is faulty.
  • Occupant detection control module is faulty.
 Inspection steps
B1771 Buckle switch malfunction
  • Passenger's seat buckle switch is faulty.
  • Passenger's buckle switch circuit is open, shorted, or short-circuited to ground.
  • Occupant detection system is faulty.
  • Occupant detection harness is faulty.
 DTC B1771 Buckle switch malfunction
B1795 ECM internal circuit fault Occupant detection control module is faulty. Circuit figure
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • You are missing required tools, torque specs, or safe lifting equipment.
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