Normal Operation
The occupant classification sensor (OCS) system is used to classify the front passenger seat occupant in the event of a deployable impact. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) .
The restraints control module (RCM) continuously monitors messages from the occupant classification system module (OCSM). If the RCM receives a fault message reported by the OCSM, it will store DTC B2290 in memory and flash LFC 16 on the air bag warning indicator.
The OCS system components (seat cushion foam pad, bladder with pressure sensor, OCSM and seat wiring harness) are calibrated to each other and are serviced as an assembly. The OCS system components are not to be installed separately. If a OCS system component or seat cushion foam pad are needed, a new OCS system service kit (seat cushion foam pad, bladder with pressure sensor, OCSM and seat wiring harness) must be installed as an assembly.
| Fault PIDsa | Description | Fault Trigger Condition |
|---|---|---|
| 2290_24_OD and 2290_24_CM | OCS Sensing Element Fault, Front Pass. side | When the occupant classification system module (OCSM) senses a failure on one of the bladder pressure sensor circuits, a fault will be indicated. |
| 2290_25_OD and 2290_25_CM | OCS Calibration Fault, Front Pass. side | When the OCSM senses a difference in stored data, a fault will be indicated. |
| 2290_26_OD and 2290_26_CM | OCS Communications Fault, Front Pass. side | When the OCSM is unable to communicate with the restraints control module (RCM), a fault will be indicated. |
| 2290_27_OD and 2290_27_CM | Generic OCS Module Fault, Front Pass. side | When the OCSM senses a fault with the bladder pressure sensor and/or circuits, 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 memory status and are associated with continuous DTC B2290.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- OCS system component
- RCM