Pinpoint Test 4: DTC B2290 - Occupant Classification System (OCS)Fault
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PINPOINT TEST 4: DTC B2290 - OCCUPANT CLASSIFICATION SYSTEM (OCS) FAULT
NOTE: DTC B2290 reported by the restraints control module (RCM) is informational only and indicates the presence of a fault in the occupant classification system module (OCSM). Refer to the Supplemental Restraints System (SRS) DTC Chart Diagnostic Instructions - DTC Chart when DTC B2290 is reported by the RCM for diagnostic instructions. The following pinpoint test must only be used to diagnose DTC B2290 when reported by the OCSM.
Normal Operation
The occupant classification sensor (OCS) is used to classify the front passenger seat occupant in the event of a deployable impact. See Description and Operation.
The 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 restraints control module (RCM) which will store DTC B2290 in memory and send a message to the instrument cluster 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, 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 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.
Possible Causes
- Wiring, terminals or connectors
- Faulty OCS system component
- Pressure sensing fault
- Module mounting condition
Diagnostic Procedure
WARNING: Always wear eye protection when servicing a vehicle. Failure to follow this instruction may result in serious personal injury.
WARNING: Do not handle, move or change the original horizontal mounting position of the restraints control module (RCM) while the RCM is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the safety canopy and cause serious personal injury or death.
WARNING: Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.
WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.
CAUTION: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.
NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: To identify between a production occupant classification sensor (OCS) system and an OCS system service kit, inspect the OCSM electrical connector. A production OCS system allows the disconnect of the electrical connector from the OCSM.An OCS system service kit has the OCSM electrical connector glued to the module. It cannot and should not be disconnected or altered.
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