I started to check for your information last week , on mitchell on demand they said then you can program your key to set your audio unit as you want ,

Exemple : your favorite radio channel 94.7 , when your car received the signal from your key it's gonna put the radio at 94,7 but if it's your girlfriend key it gonna put it at 106,7


So Yes it's with the audio system , BUT , I've check the wiring diagram of your car and , nothing shows then by disconnecting the radio unit your keyless entry will stop working


I'm working on that for a perfect anwser


See ya

Sorry for my english i'm from quebec