Pinpoint Test 5: DTC B2290 - Occupant Classification System (OCS) Fault

PINPOINT TEST 5: DTC B2290 - OCCUPANT CLASSIFICATION SYSTEM (OCS) FAULT

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NOTE: DTC B2290 reported by the RCM is informational only and indicates the presence of a fault in the occupant classification sensor (OCS) module. Refer to the Supplemental Restraints System (SRS) Diagnostic Trouble Code (DTC) Index 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 OCS module.

Normal Operation
The occupant classification sensor (OCS) is used to classify the front passenger seat occupant in the event of a deployable impact. See PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH, The OCS module monitors the pressure sensor and circuitry for faults. If the OCS module detects a fault with the sensor or circuitry, it will store diagnostic trouble code (DTC) B2290 in memory and send a message to the restraints control module (RCM) which illuminates the air bag indicator.

The OCS system components (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 wiring harness, seat cushion frame, seat cushion foam pad, bladder with pressure sensor and electronic control unit) must be installed as an assembly.

Fault Conditions
The OCS module monitors for the following fault conditions:
- Faulted circuit
- Pressure sensing fault
- Faulted module mounting condition
- Communication failure

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

NOTE: To identify between a production OCS system and an OCS system service kit (OCS service kit), inspect the OCS module electrical connector.

A production OCS system allows the disconnect of the electrical connector from the OCS module.
An OCS system service kit has the OCS module electrical con rector glued to the module. It cannot and should not be disconnected or altered.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough Inspection and Verification before proceeding with the pinpoint test.