Mercedes-Benz B-Class Airbag Control Module Replacement Parts

Yes, all generations of the Mercedes-Benz B-Class were fitted with an airbag control module (also called the SRS control unit) as standard, managing the airbag, seatbelt pretensioner, and crash sensor systems throughout the car. It is typically located under the centre console or beneath the front seats. Because this is a safety-critical component, professional fitting by a qualified technician is strongly recommended.

These are from different generations — the first-generation B-Class (W245) ran from 2005 to 2011, while the second-generation (W246) ran from 2011 to 2018 — so a module from a 2009 car is very unlikely to be compatible with a 2013 car. The SRS systems across these generations are distinct, and cross-generation fitment should not be assumed. Confirm with the breaker against your exact registration before purchasing.

Trim level can potentially matter on the B-Class because higher trims may include additional airbags or seat-mounted side airbags that affect how the SRS module is configured. Whether your specific trim's airbag setup matches the donor car's module is something you should confirm with the breaker against your registration. As a general principle, always try to source from a car of the same generation and ideally the same trim level.

No, the engine or gearbox fitted to your B-Class does not affect airbag control module fitment — this is an interior safety system unrelated to the drivetrain. What matters is the generation of the car: W245 (2005–2011) or W246 (2011–2018), and your trim level. Always confirm the module is compatible with your specific SRS configuration by providing your registration to the breaker.

Both a 2012 and a 2014 B-Class fall within the second-generation W246 (2011–2018), but the W246 received a facelift in 2015, so a 2014 and a 2012 car are both pre-facelift and may be more likely to share compatible modules. That said, whether the SRS module from one pre-facelift W246 will work with another depends on the specific variant and software configuration, so you must confirm compatibility with the breaker using your registration.

Airbag control modules are safety-critical components, and fitting or replacing one incorrectly can result in airbags failing to deploy in a crash or deploying unexpectedly, both of which can cause serious injury. It is strongly recommended that this part is installed and coded by a qualified mechanic or Mercedes specialist. Additionally, if the module has previously been deployed or triggered, it is a single-use component and must be replaced rather than reused — always check with the breaker whether the unit they are supplying is from an undeployed system.