Body, generic

B00C1 Passenger Seat Occupant Classification Sensor B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00C1 belongs to input B of the passenger seat classification. It is unpublished as such, but Toyota shows why a seat can carry several such sensors: on 2012–2013 Camry, Prius c and Yaris and 2013 Avalon, a left and a right weight detector sit between seat frame and rails. Their readings decide whether the passenger bag is armed, and they also serve as collision sensing. In campaign F0B (about 753,200 US cars) Toyota found that some seating habits or rough roads were taken for a rear impact, lighting the airbag lamp and AIR BAG OFF; dealers fitted new sensors, torqued them to 30 N·m, zeroed the system and verified its sensitivity. Whether B stands for such a right-hand cell is not documented. With B00C1 the airbag lamp is on.

Likely causes

Load cell B damaged or drifting, for example after the seat was forced or dropped
Seat pan or sensor bolts fitted under tension or with the wrong torque, preloading the cell
Zero-point calibration not done after sensor or seat work
Poor contact at the plug of sensor B

Symptoms

  • Airbag warning lamp on
  • Passenger airbag off lamp lit although an adult is seated
  • Safety note: passenger airbag status may be wrong; disconnect seat sensors only de-energised, keep tightening torques and run the zero-point calibration with the scan tool, specialist workshop only

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,000
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

passenger classification sensor bsrs seat wiringoccupant classification module

Related codes

B00C0B00C2B00A0B00B1

References: static.nhtsa.gov, static.nhtsa.gov.