Description

DESCRIPTION





The Occupant Classification Module (OCM) (1) is secured with two screws to a stamped steel mounting bracket welded onto the underside of the passenger side front seat cushion frame near the inboard front corner. Concealed within a hollow in the center of the molded plastic OCM housing is a microprocessor and the other electronic circuitry of the module. The module housing is sealed to enclose and protect the internal electronic circuitry.

Two mounting tabs (4), a connector lock tower (2), and a connector receptacle (3) are integral to the OCM housing. The connector receptacle contains terminal pins that connect the OCM to the vehicle electrical system through a dedicated take out and connector of the passenger side front seat wire harness. A molded plastic lock pin is integral to one end of a long tether, while the other end of the tether is secured to the seat wire harness. After the wire harness has been connected to the module, the lock pin is engaged through the lock tower on the module housing preventing the connector latches from becoming disengaged and ensuring that a secure electrical connection is maintained at all times.

A non-calibrated OCM is the only component of the Occupant Classification System (OCS) that is available for separate service replacement. The OCS components of the passenger side front seat cushion including the cushion frame, springs, insulator pad, seat weight bladder and pressure sensor, seat cushion foam, wiring harness and the OCM are a factory-calibrated and assembled unit. Once this unit is connected to a vehicle electrically, the calibration settings are uploaded from the calibrated OCM and stored in the memory of the Airbag Control Module (ACM) (also known as the Occupant Restraint Controller/ORC). If only the OCM is subsequently replaced, the new, non-calibrated OCM learns the proper calibration settings from the ACM after it is connected to the vehicle electrically.

The OCM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced. The OCM software is flash programmable. The components of the passenger side front seat cushion including the cushion frame, springs, insulator pad, seat weight bladder and pressure sensor, seat cushion foam, wire harness and the OCM are serviced only as a factory-calibrated, assembled and tamper-evident unit. Only the OCM and the seat cushion trim are available for separate service replacement. Once a service replacement package has been installed in a vehicle, the OCM can thereafter be serviced only by replacing the entire passenger side front seat cushion unit with another complete service replacement package.