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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 453 (Supplemental Restraint System) >> Diagnosis And Testing >> Airbag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Test - Restraints Control Module (RCM) >> Pinpoint Test Y: DTC B2909 >> Normal Operation

Normal Operation

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The Belt Tension Sensor (BTS) operates in conjunction with the Occupant Classification System (OCS). The OCS 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 voltage output of the BTS is proportional to the amount of tension applied to the sensor by the belt, no-tension low voltage (approximately 0.95 volt), high-tension high voltage (approximately 3.8 volts).

The Occupant Classification System Module (OCSM) monitors the BTS and all circuitry for faults. If a fault is detected, the OCSM stores DTC B2909 in memory and sends a message to the Restraints Control Module (RCM). The RCM then sets DTC B00A0:68 and sends a message to the Instrument Panel Cluster (IPC) to illuminate the air bag warning indicator.

NOTE: Do not mistake status information displayed with DTCs for fault PID information. Fault PIDs are only retrieved in the DataLogger function of the scan tool.
DTC FAULT TRIGGER CONDITIONS

Fault PIDs (1) Description Fault Trigger Condition
2909_29_OD and 2909_29_CM Front Passenger Side Belt Tension Sensor Short to Ground When the OCSM senses a short to ground on the BTS circuits, a fault is indicated.
2909_31_OD and 2909_31_CM Front Passenger Side Belt Tension Sensor Circuit Fault When the OCSM senses a failure on the BTS circuits, a fault is indicated.
2909_30_OD and 2909_30_CM Front Passenger Side Belt Tension Sensor Circuit Open When the OCSM senses an open on the BTS circuits, a fault is indicated.
2909_28_OD and 2909_28_CM Front Passenger Side Belt Tension Sensor Circuit Short to Battery When the OCSM senses a short to voltage on the BTS signal circuit, a fault is indicated.
(1) Fault PIDs that end in OD indicate on-demand status and are associated with DTC B2909. Fault PIDs that end in CM indicate continuous memory status and are associated with DTC B2909.

This pinpoint test is intended to diagnose the following: 

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