Tests AR: DTC B2290 - Occupant Classification System (OCS) Fault

PINPOINT TEST AR: DTC B2290 - OCCUPANT CLASSIFICATION SYSTEM (OCS) FAULT

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Normal Operation

NOTE: If DTCs U1900 or U0073 are present in the RCM, they must be diagnosed before attempting to diagnose B2290.

The occupant classification sensor (OCS) system components (seat cushion pan, seat cushion foam pad, bladder with pressure sensor and electronic control unit) 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, OCS system component or seat cushion foam pad are needed, a new OCS system service kit (seat cushion pan, seat cushion foam pad, bladder with pressure sensor and electronic control unit) must be installed as an assembly.

The OCS is used to classify the front passenger seat occupant in the event of a deployable impact.

The belt tension sensor is part of the OCS system. The OCS system interprets a variable voltage signal provided by the safety belt tension sensor to identify the possible presence of a child safety seat in the front passenger seat. The voltage output of the belt tension sensor is proportional to the amount of tension applied to the sensor by the belt, no tension low voltage (approximately 0.95 volt), high tension high voltage (approximately 3.8 volts).

The restraints control module (RCM) monitors for fault conditions reported by the OCS system. If the RCM detects one of the faults reported by the OCS system, it will store diagnostic trouble code (DTC) B2290 in memory and illuminate the air bag indicator.

Fault Conditions
The restraints control module (RCM) monitors communications from the OCS system. It will store diagnostic trouble code (DTC) B2290 in memory if a fault is present in the OCS system.

NOTE: PID Module Version Status will not display when flagging DTC B2290, it must monitored independently from B2290.

The OCS system reports the following fault conditions to the RCM:
- A mounting fault.
- An ECU (internal) fault.
- A communication fault.
- A calibration fault.
- A pressure sensing fault.
- A module version status-RCM version conflicts with OCS version.

Possible Causes
An occupant classification sensor (OCS) fault can be caused by:
- damaged wiring, terminals or connectors.
- a faulty OCS system component.
- a faulted RCM.