What it means
This code identifies a fault associated with the driver seat belt pretensioner A deployment control. The restraint control module sets it when it detects a problem in that deployment control; the exact fault is specified by accompanying subfault information.
How it works
The driver seat-belt pretensioner A is a crash-activated device that rapidly tightens the belt. The restraint control module monitors its deployment-control circuit, and B0070 records a fault in that circuit; the accompanying subfault information identifies the detected condition.
Common causes
Most likely first.
- Pretensioner wiring or connector fault
- Open or shorted deployment circuit
- Faulty driver seat belt pretensioner
- Restraint control module fault
Symptoms
- Airbag warning light on
- Driver seat belt pretensioner may not activate in a crash
How to diagnose it
- Read the restraint module's subfault details and freeze-frame data to determine what condition it detected in the driver pretensioner A circuit.
- Inspect the driver belt and retractor area for damage, prior repairs, or disturbed wiring and connectors.
- Check the pretensioner circuit harness and connectors for pin damage, corrosion, looseness, or chafing, following the vehicle's restraint-system safety instructions.
- With the manufacturer's specified method, test the deployment circuit for an open or short and compare results with the manufacturer's specification.
- If the circuit checks pass, follow the manufacturer's procedure to assess the driver pretensioner and then the restraint control module.
Common fixes
- Secure or repair damaged driver pretensioner wiring or connector using the approved restraint-system procedure.
- Repair an open or short in the driver pretensioner A deployment circuit.
- Replace the driver seat-belt pretensioner if testing confirms it is faulty.
- Repair or replace the restraint control module only after the circuit and pretensioner are verified.
Can I keep driving?
The vehicle may be driven, but the driver belt pretensioner may not tighten in a crash. Treat the restraint system as impaired and arrange prompt diagnosis; avoid unnecessary trips.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.