Normal Operation
The occupant classification sensor (OCS) is used to classify the front passenger seat occupant in the event of a deployable impact.
The occupant classification system module (OCSM) monitors the pressure sensor and circuity for faults. If the OCSM detects a fault with the sensor or circuitry, it will store DTC B2290 in memory and send a message to the RCM which will store DTC B2290 in memory and send a message to the instrument cluster (IC) module to illuminate the air bag warning indicator.
The OCS system components (seat cushion foam pad, bladder with pressure sensor and OCSM) are calibrated to each other and are serviced as an assembly. The OCS system components are not to be installed separately. If a new OCS system component or seat cushion foam pad are needed, a new OCS system service kit (seat wiring harness, seat cushion frame, seat cushion foam pad, bladder with pressure sensor and OCSM) must be installed as an assembly.
| Fault PIDsa | Description | Fault Trigger Condition |
|---|---|---|
| 2290_12_OD and 2290_12_CM | Passenger Seat OCS Sensor No. 1 Circuit Short to Battery | When the occupant classification system module (OCSM) senses a short to voltage on the bladder pressure sensor circuits, a fault will be indicated. |
| 2290_13_OD and 2290_13_CM | Passenger Seat OCS Sensor No. 1 Circuit Short to Ground | When the OCSM senses a short to ground on the bladder pressure sensor circuits, a fault will be indicated. |
| 2290_15_OD and 2290_15_CM | Passenger Seat OCS Sensor No. 1 Internal Fault | When the OCSM senses a internal failure with the bladder pressure sensor, a fault will be indicated. |
a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2290. Fault PIDs that end in CM indicate continuous monitor status and are associated with continuous DTC B2290.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Faulty OCS system component
- Pressure sensing fault
- module mounting condition