Module, Occupant Classification: Installation
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, Occupant Classification System (OCS), seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to follow these instructions may result in accidental airbag deployment.
The Occupant Classification System (OCS) is used only in the passenger side front seat of vehicles manufactured for domestic markets. Vehicles manufactured for export markets use the Occupant Detection Sensor (ODS) instead of the OCS on the passenger side front seat.
All of the components of the Occupant Classification System (OCS) including the Occupant Classification Module (OCM), the Seat Weight Sensor (SWS), the jute-like SWS pad, the passenger seat cushion foam, the electronic pressure sensor and the OCS pressure hose are serviced only as a factory-calibrated and assembled unit. Any time any one of these components requires replacement for any reason, discard all of the removed OCS components including the OCM with integral and internal electronic pressure sensor, the pressure hose, the SWS, the jute-like SWS pad and the seat cushion foam. They MUST BE REPLACED WITH THE ENTIRE CONTENTS OF THE FACTORY-CALIBRATED OCS SERVICE REPLACEMENT PACKAGE and then re-zeroed using a diagnostic scan tool. Refer to the appropriate diagnostic information.
- Position the Seat Weight Sensor (SWS), the jute-like SWS pad (2), the Occupant Classification System (OCS) pressure hose and the Occupant Classification Module (OCM) with integral electronic pressure sensor to the top of the front seat cushion frame as a unit. Lift the back of the SWS and pad far enough to access and insert the OCM and pressure hose between the seat cushion springs to the underside of the seat cushion frame. Be certain the pressure hose is not pinched or kinked.
- Install the two push-in plastic fasteners that secure the SWS and jute-like pad to the seat cushion pan (3).
- Position the seat cushion foam (1), the seat cushion heater mat (if equipped) and the seat cushion ventilation unit (if equipped) onto the seat cushion frame.
- Install the trim cover onto the passenger front seat cushion. Refer to COVER, SEAT CUSHION, INSTALLATION
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- From the underside of the seat cushion, snap the OCM (4) onto the blade (2) of the mounting bracket (3) beneath the inboard front corner of the seat cushion. Route the pressure hose away from sharp or moving objects and be certain the hose is not kinked.
- Connect the seat wire harness connector (1) to the OCM beneath the inboard front corner of the seat cushion.
- Install the passenger front seat into the vehicle. Refer to SEAT, INSTALLATION .
- Do not connect the negative battery cable at this time. The Supplemental Restraint System (SRS) Verification Test procedure should be performed following service of any SRS component. Refer to STANDARD PROCEDURE .
- If this Electronic Control Unit (ECU) is being replaced with a new unit, a diagnostic scan tool MUST be used to align the PROXI configuration data into the new ECU. Follow the routine outlined in the diagnostic scan tool for PROXI Configuration Alignment under Body Control Module (BCM) Miscellaneous Functions menu.NOTE:
The re-zero function will not complete if any OCM faults are active. Ensure that all faults are cleared or are in stored status.
- Following successful completion of the SRS Verification Test procedure and PROXI configuration, perform the OCM System Verification Test procedure found in the diagnostic scan tool under Miscellaneous Functions. Refer to the appropriate diagnostic procedures.