Body, generic

B00B9 Driver Seat Occupant Position Sensor C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00B9 is the third occupant position sensor of the driver seat. No carmaker publishes it. A third input could judge posture from the seat back: a patent now held by Joyson places two electric field electrodes under the seat-back cover, one across the upper middle and inboard side and one along the outboard edge, and combines them with seat weight to block the side airbag when a small occupant leans into its path. Honda applied the same idea on the passenger side with OPDS sensors in the seat-back, which must be initialised after the cover or sensor is replaced and can be upset by a damp seat. Whether a driver seat uses the letter C for such an electrode is not documented. A stored B00B9 brings on the airbag lamp.

Likely causes

Seat-back cover or sensor replaced without initialisation
Damaged seat-back harness or plug under the seat
Damp seat or accessory seat cover disturbing the electric field

Symptoms

  • Airbag warning lamp on
  • Side airbag suppression for leaning occupants unavailable
  • Safety note: airbag system with seat side airbag; disconnect seat plugs only de-energised; initialise/calibrate after sensor or cover replacement, specialist workshop only

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

driver occupant position sensor csrs seat wiringsrs control module

Related codes

B00B8B00BAB00B7B00BBB00A1

References: patents.google.com, rts.i-car.com.