Test R: LFC 16 DTC B2909 - Belt Tension Sensor Fault

PINPOINT TEST R: LFC 16 DTC B2909 - BELT TENSION SENSOR FAULT

Normal Operation
The belt tension sensor operates in conjunction with the occupant classification system module (OCSM). The OCSM 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 from no tension low voltage (approximately 0.95 volt) to high tension high voltage (approximately 3.8 volts).

The OCSM monitors the belt tension sensor and circuitry for faults. If the OCSM detects a fault on any of the belt tension sensor circuits, it will store DTC B2909 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 flash a LFC 16 (or higher priority code if one exists) on the air bag warning indicator.

The occupant classification sensor (OCS) system components (seat wiring harness, 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 belt tension sensor.

NOTE: When monitoring fault and/or resistance PIDs with the scan tool, it may take up to 2 seconds for the scan tool display to update.