Just pull back your driverside panel by the back seat and look in there for a amp, if you can see a big hole that shows the inside wall of the driver side quarter panel, then , no you don't have one. But, if you see a big squarish shaped bracket and a couple of connectors plugged into it at the bottom, then you do have one.
Unless you have in the infinity sound system, then you don't. As far a looking for a remote turn on wire, look at the fuse box, your windshield wiper fuse runs off of an acessory circuit, but I think it's easiest going to the cig lighter.
I dunno about going to the cig. lighter. Those are usually constant. Granted in my Tib it's switched. But get a DMM (multimeter) and check fuses at the box to see which ones only get 12v when the key is turned to on. then just tap your wire in with that fuse.