scenic mk1 radio wiring

[C5Alan]

Just wondering if anyone knows what wires in the radio are the mute and permanent live I'm trying to fit a Bluetooth hands-free kit I've got it working but would like it to automatically mute and not have to hit the button the stalk. I need to get a permanent live so it dosnt turn off after when I turn off the ignition and still chatting. I'm sure if u sit down with a multi meter would sort these but if someone knows it would save all the hassle cheers