Body, generic

B007A Passenger Seat Belt Pretensioner B Deployment Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B007A is the passenger-side twin of B0079 and covers the second pretensioner on the front passenger seat. Mercedes lists B007A13 for an open in the squib of the passenger's belt end fitting tensioner on the A-, CLA- and GLB-Class and keeps the passenger retractor apart as B007F. A lap or anchor pretensioner of this kind fires together with the retractor unit, as Joyson explains for its lap pretensioner, and draws the lap belt down onto the pelvis to cut the risk of sliding under it. Mitsubishi files comparable lap pretensioners under its own codes B1001 and B1002 rather than in J2012 slots, so B007A is not expected there. Once B007A is set, the airbag lamp comes on and the module records that the passenger's lap tensioning is unavailable.

Likely causes

Plug at the passenger end fitting tensioner disturbed, e.g. after seat removal
Lead to the lap tensioner pinched under the passenger seat
Internal fault of the passenger lap tensioner

Symptoms

  • Airbag warning lamp on
  • Passenger's lap belt not tightened in a crash, higher risk of sliding under it
  • Safety note: pyrotechnic tensioner next to the seat; disconnect the battery, observe the wait time, have a specialist workshop do the repair

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–600
Time0.5–2.5 h

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

Parts involved

passenger pretensioner bsquib circuitsrs control module

Related codes

B0072B007FB0079B0082

References: static.nhtsa.gov, static.nhtsa.gov, joysonsafety.com, mitsubishitechinfo.com.