Grand Cherokee 2WD V6-3.7L (2008)
Seat Occupant Classification Module - Air Bag: Description and Operation
Description
DESCRIPTION
The Occupant Restraint Controller (ORC) (1) is secured with three screws to a stamped steel mounting bracket welded onto the top of the floor panel
transmission tunnel adjacent to the park brake mechanism and beneath the center floor console in 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 secured to the bottom of the ORC housing
with seven screws to enclose and protect the internal electronic circuitry and components.
An arrow (2) printed on the label (3) on the top of the ORC housing 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 integral mounting flanges (4) on the left front and rear corners and near the center of
the right side. The stamped metal cover plate has two integral locating pins on its lower surface. Two molded plastic electrical connector receptacles (5)
exit the forward facing side of the ORC housing. These receptacles connect the ORC to the vehicle electrical system through two dedicated take outs and
connectors, one from the instrument panel wire harness and the second from the body wire harness.
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 airbags. The ORC cannot be repaired or adjusted and, if
damaged or ineffective, it must be replaced.
