Sprinter 3500 V6-3.0L DSL Turbo (2008)
Seat Occupant Classification Module - Air Bag: Description and Operation
Description
DESCRIPTION
The Occupant Restraint Controller (ORC) (2) (also known as the lowline or highline airbag control unit/ARCADE) is secured with three screws to the
top mounting surface of a stamped steel bracket that is welded onto the floor panel transmission tunnel just forward of the center support (1) for the
instrument panel within the passenger compartment of the vehicle. Concealed within a hollow in the center of the die cast aluminum ORC housing is the
electronic circuitry of the ORC which includes a microprocessor, an electronic impact sensor, an electronic safing sensor, and an energy storage
capacitor. A stamped metal cover plate is permanently secured to the bottom of the ORC housing to enclose and protect the internal electronic circuitry
and components.
An arrow printed on a label on the top of the ORC housing near the rear provides a visual verification of the proper orientation of the unit, and should
always be pointed toward the front of the vehicle. The ORC housing has three integral mounting bosses. Two molded plastic electrical connector
receptacles exit the right facing side of the ORC housing. These receptacles connect the ORC to the vehicle electrical system through two dedicated take
outs and connectors of the vehicle wire harness (3).
The impact sensor and safing sensor internal to the ORC are calibrated for the specific vehicle, and are only serviced as a unit with the ORC. In addition,
there are unique versions of the ORC for vehicles with or without the optional side curtain (also known as window) airbags or the optional seat (also
known as thorax) airbags. Each replacement ORC must be electronically programmed for the correct standard and optional supplemental restraint system
components installed in the vehicle. The ORC cannot be repaired or adjusted and, if damaged or ineffective, it must be replaced.
