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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1110 (Supplemental Inflatable Restraint System) >> Diagnostic Tests >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Pinpoint Tests >> Pinpoint Test E: DTC B1057 - Driver Air Bag Cross Link to Another Firing Loop >> Normal Operation

Normal Operation

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The restraints control module (RCM) monitors all deployable devices for a cross link fault between deployable circuits. If the RCM detects a fault between the circuits of one deployable device and another deployable device, it will store a DTC for each of the cross linked loops indicating a fault. The RCM sends a message to the instrument cluster (IC) module to flash a LFC of the cross link DTCs (or higher priority code if one exists) on the air bag warning indicator. When a normal loop fault is present (one loop is either shorted to battery/ground, has an open circuit or has low resistance), then cross link diagnostics will not be active. Once the normal loop fault is repaired, then the cross link diagnostics will resume.

DTC Description Fault Trigger Conditions
B1048 - Passenger Side Air Bag Cross Link to Another Firing Loop If the RCM detects a short between the circuits of the passenger air bag module loop 1 and the circuits of another deployable device, it will set this DTC and the cross link DTC of the corresponding deployable device.
B1049 - Passenger Seatbelt Pretensioner Cross Link to Another Firing Loop If the RCM detects a short between the circuits of the passenger safety belt buckle pretensioner and the circuits of another deployable device, it will set this DTC and the cross link DTC of the corresponding deployable device.
B1054 - Driver Seatbelt Pretensioner Cross Link to Another Firing Loop If the RCM detects a short between the circuits of the driver safety belt buckle pretensioner and the circuits of another deployable device, it will set this DTC and the cross link DTC of the corresponding deployable device.
B1057 - Driver Air Bag Cross Link to Another Firing Loop If the RCM detects a short between the circuits of the driver air bag module loop 1 and the circuits of another deployable device, it will set this DTC and the cross link DTC of the corresponding deployable device.

This pinpoint test is intended to diagnose the following:

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