B007A

What it means

B007A refers to the passenger seat belt pretensioner 'B' deployment control in the restraint (airbag) system. The restraint control module monitors the pretensioner firing circuit and its drive, and it has detected a fault in that control, such as an abnormal resistance, an open or short circuit, or a fault reported by the module itself. The exact circuit tested and the way the fault is detected depend on the vehicle, so check manufacturer data for which pretensioner is 'B'.

Symptoms

• Airbag or SRS warning light on the dashboard
• Passenger seat belt pretensioner may not fire in a crash
• Passenger airbag status or seat belt warning showing a fault
• Fault stored in the restraint control module, possibly alongside other passenger-side restraint codes
• Intermittent warning light after the passenger seat has been moved or the belt used

Possible causes

• Poor connection or damaged contacts at the pretensioner connector, often under or beside the passenger seatlikely
• Damaged or chafed wiring in the passenger seat or B-pillar harness, from seat movement or previous worklikely
• Faulty pretensioner unit with an open or out-of-range internal resistancepossible
• Corrosion or moisture in the connector or harness, for example from a water leak into the footwellpossible
• Previous crash damage, or a pretensioner that has fired and has not been replaced, with the crash data not cleared correctlypossible
• Faulty restraint control module output stage or an internal faultrare

How to diagnose

1. Read all stored codes and any freeze frame or status data, and note whether the fault is current, intermittent or stored and whether other restraint codes are present.
2. Ask about previous accident repairs, seat removal, trim work or water leaks in the passenger footwell.
3. Visually inspect the passenger seat belt pretensioner, its connector and the harness for damage, pinching, corrosion or loose or pushed-back pins.
4. Check that any yellow restraint connectors are fully seated and that their locking or shorting clips are intact.
5. With the battery disconnected and the stored-energy wait time observed, inspect and check the harness continuity using the manufacturer's procedure. Never probe, or apply a test lamp or ohmmeter to, the firing circuit directly.
6. Move the seat and belt through their full range with live data open to see whether the fault comes and goes, which points to a wiring or connector fault.
7. Check the live data for the pretensioner circuit resistance or status in the restraint module, where the vehicle supports it.
8. If the harness and connector are sound, follow the manufacturer's procedure to test the pretensioner and the restraint module, including a check for any software updates.

How to fix

• Clean, repair or replace the damaged connector or terminals, following the manufacturer's restraint-system repair rules.
• Repair or replace the damaged section of harness, using the approved method for restraint wiring.
• Replace the faulty or already-fired pretensioner, or the whole belt assembly if the manufacturer requires it.
• Dry out and treat any water ingress, and replace corroded connectors or harness.
• Replace or reprogram the restraint control module only after confirming it is the fault, then clear the code and confirm the warning light stays off.

Can I keep driving?

Nearby codes

• B0079GenericDriver Seat Belt Pretensioner B Deployment Control
• B007BGenericSecond Row Left Seat Belt Pretensioner B Deployment Control