Cadillac sts dead battery cant open car with remote key fob

Don't you still have a door key?Otherwise jack up the car and remove the engine under body cover.Between the radiator support and the engine are some hard lines.Remove the two brackets holding them,this will allow you room to get to the starter.Hook the red end of a jumper cable to the red battery cable that's connected to the starter.Black to a suitable ground and charge the battery.A battery charger is easier to use,use that if you have one.If jumping off a car make sure the cables are hooked to the dead car first and grounded to the engine not the battery of the car doing the charging.Sure hope this helps!

I went to the GM dealership and had them make me a new key for $35. You'll need your liscense and title.