Seat Weight Bladder & Pressure Sensor: Description
Vehicles equipped with the Occupant Classification System (OCS) have a seat weight bladder and pressure sensor unit that is integral to the passenger front seat cushion. The bladder is sandwiched between the seat cushion pan and seat cushion foam. See Fig 1.
The bladder consists of two sheets of an elastomeric material and a molded plastic elbow fitting. The two sheets of material are sealed together around their perimeter and heat staked to each other at numerous regular points within their field. The elbow fitting passes through a clearance hole in the seat cushion pan. The bladder is then filled with a silicone fluid to become a pliable, quilted membrane.
Under the seat cushion a short tube is securely clamped at one end to the bladder nipple, and at the other end to a nipple on the electronic pressure sensor. The sensor mounts on a clip attached to the seat cushion pan.