I tinkered with it just a little so far, found it's connected to a white wire behind the kick panel, but haven't followed it. I turned car on, pushed black button----nothing. Turned car off, pushed black button, tried to start...it started....not sure if I'm doing it correctly or not...or even what it is, but being so hidden, it must have something to do with an alarm or kill switch.

I just ordered a Remote for the factory alarm system (I did find the black box down there with the green button). After I get the remote, I'm going to play around some more to try to figure out what the black button does. It's on the far edge of the kick panel , way up under the dash, so it's as hidden as it could possibly be.

Am I testing the kill switch function in the right order?