Airbags

B007B — Second Row Left Seatbelt Pretensioner 'B' Deployment Control Circuit Fault

Severity: medium Drive with care, to a shop

What B007B means

The airbag (SRS) control module constantly tests the squib circuits, including seatbelt pretensioners. B007B means it found a problem in the deployment control circuit of pretensioner 'B' on the second row left belt: an open, short, out-of-range resistance or poor connection. While the fault is active, that pretensioner may not fire in a crash.

Symptoms

  • Airbag/SRS warning light is on or flashing
  • Scan tool shows a rear left pretensioner circuit fault
  • Fault appeared after interior work or rear seat removal
  • Warning may come and go with a loose connection

Possible causes

  1. Faulty second row left seatbelt pretensioner
  2. Open, shorted or damaged wiring in the pretensioner circuit
  3. Corroded or partly latched connector at the belt or under the seat
  4. Harness damaged during seat or trim removal
  5. Poor connection at the SRS module connector
  6. Failed SRS control module (uncommon)

How to diagnose

  1. Scan all codes with an SRS-capable tool, save freeze frame data and look for other airbag faults
  2. Inspect the harness and connector at the rear left pretensioner for damage, corrosion or past repairs
  3. Confirm the connector is fully seated and its locks are intact
  4. Check that the harness isn't pinched by the seat, trim or cargo
  5. Disconnect the battery and wait the manufacturer's specified time before working on SRS circuits
  6. Test circuit resistance per the factory wiring diagram; never probe the squib with an ordinary multimeter
  7. Inspect the SRS module connector and wiring leading to it
  8. Clear the code after repair and confirm it doesn't return

Common fixes

  • Repair or replace damaged wiring and connectors in the pretensioner circuit
  • Clean the terminals and secure the connector properly
  • Replace the second row left seatbelt pretensioner assembly
  • Replace the SRS module if the fault is confirmed there

Questions and answers

What does B007B mean?

The SRS module detected a fault in the control circuit of pretensioner 'B' on the second row left seatbelt. The usual causes are wiring, a connector or the pretensioner itself.

Can I test the pretensioner circuit myself?

You can visually inspect connectors after disconnecting the battery and waiting the specified time. Do not measure the squib with a regular meter, as it is dangerous; leave testing to a professional.

Will the seatbelt work in a crash with B007B set?

The belt still works as a normal belt, but the pretensioner may not fire because its circuit is faulty.

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.