Pinpoint Test W: DTC B2909
Refer to Wiring Diagrams Cell 46, Supplemental Restraint System for schematic and connector information.
Lamp Fault Codes (LFCs)
The following Lamp Fault Codes (LFCs) indicate the specific fault PIDs associated with DTC B2909:
LFC 7-13 — Belt Tension Sensor Open or Short to Battery
LFC 7-14 — Belt Tension Sensor Short to Ground
Normal Operation
The Belt Tension Sensor (BTS) operates in conjunction with the Occupant Classification Sensor (OCS) system. The Occupant Classification System Module (OCSM) for the OCS system interprets a variable voltage signal provided by the BTS to identify the possible presence of a child safety seat in the front passenger seat.
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 with the exception of the BTS. 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 OCSM) must be installed as an assembly. Refer to Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) in this section.
The OCSM monitors the BTS circuits for faults. If a fault is detected on any of the BTS sensor circuits, it will report the failure to the Restraints Control Module (RCM). The RCM will store DTC B2909 in memory and, depending on the fault, flash a LFC on the air bag warning indicator. The secondary air bag warning chime will also be activated.
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