Theory Of Operation

The Occupant Classification Module (ACM), seat cushion and bladder are calibrated as one unit in the assembly plant. The ACM will automatically re-calibrate the assembly from time to time to retain the calibrated relationship between the seat, bladder and module as the seat and bladder change due to age and wear. The re-zero Occupant Classification Module Test uses a scan tool process called the Occupant Classification System Verification Test to force the ACM to re-calibrate or re-zero. To ensure the up to date calibration and functional performance the scan tool Occupant Classification System Verification Test is performed during and after servicing the system.