B007A code meaning
Passenger Seat Belt Pretensioner B Deployment Control
What B007A means
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.
B007A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B007A
- 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
Common causes of B007A
- Most likelyPlug at the passenger end fitting tensioner disturbed, e.g. after seat removal
- PossibleLead to the lap tensioner pinched under the passenger seat
- Less likelyInternal fault of the passenger lap tensioner
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Passenger pretensioner bSquib circuitSRS control module
What each part of B007A means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7A | The exact fault in that area. |
What to do next
- Note B007A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B007A
What does B007A mean?
B007A means "Passenger Seat Belt Pretensioner B Deployment Control". B007A is the passenger-side twin of B0079 and covers the second pretensioner on the front passenger seat. It is a generic code, so it means the same on every make.
Is it safe to drive with B007A?
B007A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B007A fail an emissions test?
B007A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B007A to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will B007A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.