Apparatus for sensing position of a vehicle seat

An apparatus (10) for sensing when a rail member (48) of a vehicle seat (12) is located in a reference position relative to a seat bracket (30) of the vehicle seat (12) comprises a magnetic sensor (76) for generating a magnetic field and for sensing a flux density of the magnetic field. The apparatus (10) further comprises a cover (86) for enclosing the magnetic sensor (76). The cover (86), when in a first position, forms a zone for preventing the flux density from increasing above a threshold level. The cover (86) is moved into a second position when the rail member (48) is located in the reference position relative to the seat bracket (30). In the second position, the flux density is increased above the threshold level.