Lincoln 8T4Z-78042D94-A Module - Air Bag

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Never measure the resistance of any SRS component, as an ohmmeter has a built-in battery supply that could accidentally deploy the airbag. Never use electrical welding equipment on a vehicle equipped with an airbag without first disconnecting the negative battery cable. Never dispose of a live airbag module. Return it to your dealer for safe deployment, using special equipment, and disposal.

The sensing and diagnostic module supplies the current to the airbag system in the event of a collision, even if battery power is cut off. It checks the system every time the vehicle is started, causing the "AIR BAG" light to go on and then off if the system is operating properly. If there is a fault in the system, the light will go on and stay on, flash, or the dash will make a beeping sound. If this happens, the vehicle should be taken to your dealer immediately for service.