Body, generic

B009B Left Side Restraints Sensor 5

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B009B names a fifth crash sensor on the left side. No carmaker documents this code publicly, and the reviewed bulletins and airbag indexes stop well before it. Why vehicles carry several side satellites at all follows from FMVSS 214: cars must protect occupants in a moving barrier crash and in a vehicle-to-pole test, and a narrow pole can strike anywhere along the side. Continental offers two kinds of satellites for this: the gSAT reports acceleration from rigid structure, the pSAT reacts to the pressure rise of a crushed door. A fifth left unit would most likely monitor a rear door or an extra seat row. When B009B is stored, the module has rejected that sensor's signal or circuit, and side or curtain airbags may react later on that side. The airbag lamp is lit.

Likely causes

Line or connector fault on the way to the fifth left sensor
Internal fault of the fifth left satellite (pressure or acceleration type)
Replacement sensor of the wrong part number after a body repair

Symptoms

  • Airbag warning lamp on
  • Side and curtain airbags on the left may deploy later in a side impact
  • Safety note: airbag system; switch off, disconnect the battery and keep the wait time before work, specialist workshop only

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–500
Time0.5–3 h

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

Parts involved

left side restraints sensor 5srs wiringsrs control module

Related codes

B009AB009CB009E

References: law.cornell.edu, aapexshow.com, bosch-mobility.com.