Simplest first test is to pull the fuses for the NAV if you have it, the fuse for the stereo and the fuse for the bluetooth, if you have it. Also, the fuse for the FSR.

These are the usual culprits for parasitic drain. Put one fuse back in at a time and watch to see if the car goes to sleep after 15 minutes when you close it up. If it doesn't go to sleep you found your drain.

Both times I had parasitic drain it occurred after an alternator failure. The telematic (bluetooth) unit would not go to sleep for some strange reason. Killing the power to it and then powering it back up "reset" it and it started going to sleep like it was supposed to.