System Operation
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The shoulder belt retractor is designed to let the webbing move freely in and out at all times, except during vehicle hard braking, hard cornering or an impact of 24 kmh (14.9 mph) or more, when it is automatically locked by a mechanically actuated inertia sensor (Emergency Locking Retractor (ELR)).
When replacing safety belt buckles and/or retractor assemblies, use only the replacement parts specified in the Ford Catalog Advantage or equivalent.