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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Supplemental Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test T: LFC 16/DTC B2909 - Belt Tension Sensor Fault >> Normal Operation

Normal Operation

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The belt tension sensor (BTS) is part of the occupant classification sensor (OCS) system. The OCS system 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. No tension-low voltage is approximately 0.95 volt and high tension-high voltage is approximately 3.8 volts.

The OCS system continuously monitors the belt tension sensor circuits. If the occupant classification system module (OCSM) detects one of the following faults on any of the belt tension sensor circuits, it will report the failure to the restraints control module (RCM). The RCM will store DTC B2909 in memory and flash either LFC 16 on the air bag warning indicator.

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 belt tension sensor. If a new 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.

Fault PIDsa Description Fault Trigger Condition
2909_29_OD and 2909_29_CM Front Passenger Side Belt Tension Sensor Short to Ground When the occupant classification sensor occupant classification system module (OCSM) senses a short to ground on the belt tension sensor circuits, a fault will be indicated.
2909_31_OD and 2909_31_CM Front Passenger Side Belt Tension Sensor Circuit Fault When the OCSM senses a failure on the belt tension sensor circuits, a fault will be indicated.

a Fault PIDs that end in OD indicate an on-demand status and are associated with on-demand DTC B2909. Fault PIDs that end in CM indicate continuous memory status and are associated with continuous DTC B2909.

This pinpoint test is intended to diagnose the following:

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