Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Occupant Classification Module
The Occupant Classification Module (OCM) (1) is secured with one screw and one tab to the passenger side front seat cushion pan under the front edge of 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. One mounting tab is inserted into a slot in a dimpled pocket formation of the seat cushion pan, while a screw secures another tab to the seat pan. 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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