B2290
PINPOINT TEST 9: DTC B2290 - OCCUPANT CLASSIFICATION SYSTEM (OCS) FAULTNormal Operation
NOTE: Lamp fault code (LFC) 16 is shared between DTC B2290 and DTC B2909.
The occupant classification sensor (OCS) is used to classify the front passenger seat occupant in the event of a deployable impact. See AIR BAG AND SAFETY BELT PRETENSIONER SUPPLEMENTAL RESTRAINT SYSTEM (SRS). The restraints control module (RCM) monitors for fault conditions reported by the OCS system. If the RCM detects one of the following faults reported by the OCS system, it will store diagnostic trouble code (DTC) B2290 in memory and flash LFC 16 (or higher priority code if one exists) on 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 cushion foam pad, bladder with pressure sensor, and electronic control unit) must be installed as an assembly.
Fault Conditions
The RCM monitors communications from the OCS system. The RCM stores diagnostic trouble code (DTC) B2290 in memory if there is a loss of communication with the OCS.
The OCS system reports the following fault conditions to the RCM:
- faulted circuit
- pressure sensing fault
- faulted electronic control unit (ECU) 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.
- a faulted RCM.
WARNING: Restraint system diagnostic tools are for service only. Tools must be removed prior to operating the vehicle over the road. Failure to remove restraint system diagnostic tools could result in injury and possible violation of vehicle safety standards.
WARNING: Do not handle, move or change the original horizontal mounting position of the RCM while the RCM is connected and the ignition switch is ON. Failure to follow these instructions may result in the inadvertent deployment of the safety canopy and risk of personal injury.
WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.
WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.
WARNING: Never probe the electrical connector on a safety canopy module. Doing so can result in safety canopy deployment and could result in personal injury.
CAUTION: It is necessary to rezero the OCS system when a front passenger seat cushion is disassembled, a new trim cover installed, or an OCS service kit is installed. A scan tool is used to trigger the active command to carry out rezeroing of the OCS system.
CAUTION: Make sure the seat is completely assembled before rezeroing.
CAUTION: The following precautions must be taken before rezeroing of the OCS system:
- Make sure the OCS system components are connected and no faults are present. Make sure the OCS system is not at a temperature below 0 degree C (32 degrees F) or above 45 degrees C (113 degrees F) when initiating the rezeroing process. If the vehicle has been exposed to extreme cold or hot temperatures, the vehicle must be exposed and kept at a temperature within the limits, 0 degree C to 45 degrees C (32 degrees F to 113 degrees F) for a minimum of 30 minutes.
- Make sure nothing is present on the passenger seat before rezeroing and nothing is placed on the seat during the rezeroing process.
- Make sure a minimum eight second time period has passed after cycling the ignition switch ON before the rezeroing process.
NOTE: After diagnosing or repairing a supplemental restraint system (SRS), the restraint system diagnostic tools must be removed before operating the vehicle over the road.
NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.
NOTE: To identify between a production OCS system and a service OCS system (OCS service kit) inspect the OCS ECU electrical connector. A production OCS system allows the disconnect of the electrical connector from the OCS ECU. A service OCS system (OCS service kit) has the OCS ECU electrical connector glued to the ECU; it cannot and should not be disconnected or altered.
NOTE: Mounting and orientation of the OCS ECU is critical for proper system operation. Failure to correctly position and securely fasten the OCS ECU in place can set a diagnostic trouble code (DTC) in the RCM.
If the vehicle has been in a collision in which the passenger seat may have been damaged, inspect the OCS ECU mounting area for deformation. If damaged, a new OCS service kit must be installed. In addition, make sure the mounting area of the OCS system is restored to the original production configuration (replace as necessary).
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: If a seat equipped with a SRS component is being serviced, the SRS must be depowered.
CAUTION: When installing a new RCM, always make sure the correct RCM is being installed. The RCM 40-pin connector is keyed differently for vehicles with safety canopies and side air bags than the 40-pin connector for vehicles without safety canopies and side air bags. Do not force the 40-pin connector onto the RCM. If the connector is forced onto the RCM, damage to the RCM and/or connector will occur.
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