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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 254 (Supplemental Restraint System) >> Diagnosis And Testing >> Airbag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test AA: DTCs B0061:11, B0061:12, B0061:13 and B0061:1C >> Normal Operation

Normal Operation

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The safety 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 outputs a low voltage (approximately 0.95 volt), and high tension outputs a high voltage (approximately 3.8 volts), in relation to the reference voltage.

The Occupant Classification System Module (OCSM) monitors the BTS and all circuitry for the following faults:

If a fault is detected, the OCSM stores DTC B0061:11, B0061:12, B0061:13 or B0061:1C in memory and sends a message to the Restraints Control Module (RCM), which stores DTC B00A0:09 or B00A0:68 in memory and sends a message to the Instrument Panel Cluster (IPC) to illuminate the air bag warning indicator.

DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Condition
  • B0061:11 - Passenger Seatbelt Tension Sensor: Circuit Short to Ground
 A fault is indicated if the BTS VREF circuit is open or if the BTS signal circuit is shorted to ground. An internally-shorted BTS can also set this DTC. This DTC is detected by calculating the ratio of the measured BTS signal divided by the BTS VREF value. If the ratio equals less than.1, this DTC sets.
  • B0061:12 - Passenger Seatbelt Tension Sensor: Circuit Short to Battery
 A fault is indicated when the BTS signal circuit is shorted to battery voltage or BTS VREF. An open BTS return circuit also sets this DTC. This DTC is detected by calculating the ratio of the measured BTS signal divided by the BTS VREF value. If the ratio equals greater than.9, this DTC sets.
  • B0061:13 - Passenger Seatbelt Tension Sensor: Circuit Open
 A fault is indicated when the OCSM measures resistance above a calibrated threshold on the BTS signal circuit.
  • B0061:1C - Passenger Seatbelt Tension Sensor: Circuit Voltage Out of Range
 A fault is indicated when the OCSM measures greater than 2.0 volts on the BTS signal circuit while the passenger safety belt is not buckled.

This pinpoint test is intended to diagnose the following: 

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