Airbags

B007A — Passenger Seatbelt Pretensioner B Deployment Control Circuit Fault

Severity: medium Drive with care, to a shop

What B007A means

The SRS (airbag) control module continuously monitors the passenger seatbelt pretensioner squib circuit for resistance, opens and shorts. B007A is stored when the circuit B readings fall outside the expected range. The pretensioner may then fail to fire in a crash, so the SRS warning light comes on.

Symptoms

  • SRS/Airbag warning light on or flashing
  • B007A stored in the SRS module
  • Other seatbelt or passenger airbag circuit codes may appear
  • Light appears after seat removal, cleaning or repair work

Possible causes

  1. Open or shorted wiring in the pretensioner circuit
  2. Corroded or loose connector under the seat or at the pillar base
  3. Faulty passenger seatbelt pretensioner
  4. Connector damaged after the seat was removed or moved
  5. Faulty SRS module or communication error (rare)

How to diagnose

  1. Scan all SRS codes with a scan tool that supports airbags and note the freeze frame data
  2. Inspect connectors under the passenger seat and at the base of the pillar for corrosion, pushed-out pins or damage
  3. Check the harness for chafing, especially near moving seat parts
  4. Disconnect the battery and wait as the manufacturer specifies, then test circuit resistance only by the approved method, never applying power to the squib
  5. Compare readings with the service manual specs
  6. Clear the code and see whether it returns
  7. If needed, swap in a known good pretensioner and retest

Common fixes

  • Clean or replace the corroded connector
  • Repair or replace the damaged wiring harness
  • Replace the passenger seatbelt pretensioner
  • Replace or reprogram the SRS module if it is proven faulty

Questions and answers

What does B007A mean?

The SRS module found a fault in the passenger seatbelt pretensioner B deployment control circuit. Wiring or connectors are the most common cause, and the pretensioner itself is less often to blame.

Can I test the circuit with a multimeter myself?

No, it is risky because the squib could fire. SRS work requires a disconnected battery, the manufacturer's procedure and proper tools. If unsure, see a shop.

Will the car pass inspection with the SRS light on?

Often not, since a faulty safety system is treated as a serious defect. It is best to fix the cause beforehand.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.