Used Vauxhall Signum Airbag

The Vauxhall Signum was produced from 2003 to 2008 as a single generation, though a facelift was introduced in 2005 that brought interior and exterior updates. The facelift year is an important boundary when sourcing airbags, as trim and interior components could differ between pre-facelift (2003–2005) and post-facelift (2005–2008) cars. Always confirm with the breaker that the part number or trim specification matches your exact registration, particularly if your car sits close to that 2005 facelift point.

Your 2004 car is pre-facelift and your 2006 is post-facelift, so they sit on either side of the 2005 facelift boundary, which makes a direct swap uncertain. Interior components including airbags can vary across that boundary due to trim and specification changes. You should confirm with the breaker whether the specific unit from a 2004 car is compatible with your 2006 car's SRS system and mounting points before purchasing.

For the Vauxhall Signum, trim level can matter for airbags because seat style and interior specification varied across grades such as Elegance and Design, and side airbags in particular are often integrated into the seat. If you need a seat-mounted side airbag, confirm with the breaker that the seat type from the donor car matches yours, as a seat from a different trim may not carry the same airbag unit. For steering wheel or dashboard-mounted airbags, trim level is less likely to be a deciding factor, but confirming against your registration is still advisable.

Yes, side airbags are side-specific, so a nearside (NS, passenger side) airbag will not be the same as an offside (OS, driver side) unit. When contacting a breaker, make clear which side you need to avoid being sent the wrong part. The driver's airbag is also a separate unit from the passenger airbag, so specify exactly which location you are replacing.

Airbags are safety-critical components, and a used unit from a breaker must not have been deployed — a deployed airbag is single-use and cannot be reused. You should always have a used airbag fitted by a qualified professional who can also check the SRS system, as incorrect installation can cause the airbag to fail to deploy or to deploy unexpectedly. Confirm with the breaker that the module is undeployed and compatible with your car's specific SRS system before purchasing, as module compatibility can vary even within the same model year.

The Signum was built on the same platform as the Vectra C and shares some components, but interior and airbag parts do not automatically interchange because the cabin designs differ. Whether a specific airbag unit from a Vectra C is compatible with your Signum is not something that can be confirmed as a general rule, and you should put this question directly to the breaker along with both vehicles' registrations. A reputable breaker will be able to cross-reference part numbers to give you a reliable answer before you commit to buying.