Originally Posted by
bleufoor

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
I would say this is accurate, your keyless entry will still work fine, but if you had the option where it differentiates between the 2 keyfobs for things like radio station presets, this obviously won't work with an aftermarket stereo. I was unaware that the 1.7EL's had this in the 1st place, but my '01 Sunfire GT had it, so anything is possible.