B0022Left Curtain Deployment Control 2
- Generic OBD-II code · Body
- How the car detects it
- B0022 belongs to a second firing loop for the left curtain airbag. Mercedes-Benz shows what that means in practice: on the A-Class, CLA and GLB, B002213 is an open squib in the left rear window bag, the curtain section for the rear seats, while B0021 serves the front one (LI54.21-P-070658, version 1 of 2019 and version 4 of 2020). Cars with a single curtain inflator never set it. General Motors has older meanings for the number: the 2006 Saab 9-5 used it for driver frontal stage 1 resistance below 2.0 ohms, and Global A modules for the passenger belt retractor pretensioner, as on the 2009-11 Impala (PIC5396A) or the Saab 9-4X. The module and descriptor shown by the scan tool decide which part is meant. Airbag lamp on.
- What you may notice
- Airbag warning lamp on
- Head protection for the left rear seat may be missing
- Safety note: do not probe the airbag circuit yourself; unplug airbag connectors only with the battery disconnected and the stated wait time observed
- Likely causes
- LikelyRaised contact resistance at the restraint module connector (Mercedes LI54.21-P-070658)
- PossibleDamaged lead to the rear curtain section at the C-pillar or roof rail
- RareInternal fault in the rear left curtain airbag module
- RareFault or unsuitable software in the restraint control module
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.