Procedures
Occupant Classification Module - Installation
⚠ WARNING
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.ℹ NOTE
A non-calibrated Occupant Classification Module (OCM) is available for separate service replacement. The OCM and all of the other components of the Occupant Classification System (OCS) including the passenger side front seat, the seat weight sensors, and the passenger seat adjusters, cushion, back, frame, foam, springs, and wiring harness are a factory-calibrated and assembled unit. Any time any one of these components is removed or replaced for any reason, the OCM must be re-calibrated using a diagnostic scan tool, the Occupant Classification Seat Weight special tool, and the Occupant Classification System Verification Test. Refer to the appropriate diagnostic procedures.
- Reach under the front edge of the passenger side front seat cushion to carefully position the Occupant Classification Module (OCM) (1) to the top of the mounting bracket (4) on the inboard passenger side front seat riser (2). When the OCM is correctly positioned, the connector receptacles on the module will be pointed forward.
- Install and tighten the two screws (3) that secure the OCM to the mounting bracket. Tighten the screws to 2 Nm (20 in. lbs.).
- Reconnect the two seat wire harness connectors to the OCM connector receptacles located on the forward-facing end of the module. Be certain that the latches on each connector are fully engaged.
- Do not reconnect the battery negative cable at this time. The Supplemental Restraint System (SRS) Verification Test procedure should be performed following service of any SRS component. Service and Repair.
- Following successful completion of the SRS Verification Test procedure, perform the Occupant Classification System Verification Test using a diagnostic scan tool. Refer to the appropriate diagnostic procedures.
Occupant Classification Module - Removal
⚠ WARNING
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.ℹ NOTE
A non-calibrated Occupant Classification Module (OCM) is available for separate service replacement. The OCM and all of the other components of the Occupant Classification System (OCS) including the passenger side front seat, the seat weight sensors, and the passenger seat adjusters, cushion, back, frame, foam, springs, and wiring harness are a factory-calibrated and assembled unit. Any time any one of these components is removed or replaced for any reason, the OCM must be re-calibrated using a diagnostic scan tool, the Occupant Classification Seat Weight special tool, and the Occupant Classification System Verification Test. Refer to the appropriate diagnostic procedures.- Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before further service.
- Reach under the front edge of the passenger side front seat cushion to access and disconnect the two seat wire harness connectors from the Occupant Classification Module (OCM) (1) connector receptacles located on the forward-facing end of the module.
- Remove the two screws (3) that secure the OCM to the top of the mounting bracket (4) on the inboard passenger side front seat riser (2).
- Remove the OCM from under the passenger side front seat cushion.
Occupant Classification Module - Description
DESCRIPTION The Occupant Classification Module (OCM) (1) is secured with two screws to a stamped metal bracket on the inboard passenger side front seat riser beneath the seat cushion. 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. Four mounting tabs (2) and two connector receptacles (3) are integral to the OCM housing. The two mounting tabs designed to accept self tapping screws are used to secure the module to the mounting bracket, while the remaining two mounting tabs are unused in this application. The connector receptacles contain terminal pins that connect the OCM to the vehicle electrical system through dedicated take outs and connectors of the passenger side front seat wire harness. The OCM and all of the other components of the Occupant Classification System (OCS) including the passenger side front seat, the seat weight sensors, and the seat adjusters, cushion, back, frame, foam, springs, and wiring harness are a factory-calibrated and assembled unit. Any time any one of these components is removed or replaced for any reason, the OCM must be re-calibrated using a diagnostic scan tool, the Occupant Classification Seat Weight special tool, and the Occupant Classification System Verification Test. Refer to the appropriate diagnostic procedures. The OCM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced. The OCM software is flash programmable. A non-calibrated OCM is available for separate service replacement.