Squib Circuit Connector Lock Switch
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
The switch is a mechanism that shorts the power supply terminal to the ground terminal automatically in the air bag squib circuit when the connector is disconnected. A "short" spring is integrated inside the connector. This spring prevents static electricity from flowing to the squib by shorting the power supply terminal to the ground terminal. (i.e. there is no potential difference between the two terminals.)
CAUTION:
When the connector is disconnected, there will be short circuit between the terminals. This is not a fault.