Body, generic

B00B0 Driver Seat Occupant Classification Sensor A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B00B0 is the first of five classification inputs on the driver seat. No carmaker publishes this code, and J2012 leaves it to the maker which sensor the letter A means. Classification normally sits in the passenger seat; a Bosch patent notes that it can be omitted on the driver side, on the assumption that drivers are adults, or fitted there as well. One sensor type that could fill such a slot is a switch mat under the cushion: Autoliv patented a mat with 28 dome switches grouped in five zones, chosen from a 2,016-cell test mat loaded with FMVSS 208 dummies and child seats at several back angles. If B00B0 is stored, the restraint module no longer trusts that input, so adaptive driver airbag staging may be lost, and the airbag lamp is on.

Likely causes

Open or poor contact in the driver seat harness or plug to input A
Cushion sensor mat creased or damaged, e.g. after seat cover work
Sensor or seat replaced without the required zero-point calibration

Symptoms

  • Airbag warning lamp on
  • Driver airbag may deploy with a fixed instead of an adapted stage
  • Safety note: airbag system; unplug seat and sensor connectors only de-energised (ignition off, battery off, wait time); calibrate the sensor after 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 classification sensor asrs seat wiringsrs control module

Related codes

B00B1B00B2B00B3B00B4B00A0

References: patents.google.com, patents.google.com, law.cornell.edu.