What it means
This code identifies a fault associated with the left curtain airbag deployment control 2. 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 left curtain airbag deployment system protects occupants along the vehicle’s left side, and the restraint control module monitors its deployment circuit. B0022 indicates a fault associated with that left curtain deployment control; the companion subfault information is needed to tell whether the circuit is open, shorted, or otherwise faulty.
Common causes
Most likely first.
- Curtain airbag wiring or connector fault
- Open or shorted deployment circuit
- Faulty left curtain airbag module
- Restraint control module fault
Symptoms
- Airbag warning light on
- Left curtain airbag may not deploy in a crash
How to diagnose it
- Retrieve the restraint-module subfault and freeze-frame information with an SRS-capable scan tool to confirm the affected left curtain circuit and fault status.
- Disable the SRS by the manufacturer’s procedure, then inspect accessible left curtain harness connectors and wiring for damage, corrosion, or disconnected terminals.
- Inspect the wiring route along the left roof rail and pillars for chafing, pinching, or prior trim damage, taking care not to disturb the curtain module.
- Use the manufacturer’s SRS diagnostic method to check the identified deployment loop; do not test the inflator with a standard meter or test light.
- If the circuit checks pass, follow the diagnostic tree to assess the left curtain airbag module and restraint control module.
Common fixes
- Repair damaged or chafed left curtain wiring using the approved SRS procedure.
- Correct a loose or corroded connector in the left curtain deployment circuit.
- Repair the open or short identified by the subfault diagnosis.
- Replace the left curtain airbag module or restraint control module only when the prescribed tests confirm failure.
Can I keep driving?
The left curtain airbag may not deploy in a crash while the SRS warning is on. Get the fault checked promptly, avoid removing pillar or roof trim, and keep occupants aware that left-side protection may be reduced.
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.