VZ berlina have the wiring provision for illuminating stereo controls in the clock spring already. i've looked into this a bit and have found you will need the calais black buttons which have the LEDs behind each button and must be from VZ as VY is different plugs. you can then change the button covers to your grey ones so it matchs the rest of your interior.
There is also a missing wiring link between the BCM and the clock spring connection in the steering column. its a 12v+ and ground connection. i need a wiring diagram for the pin out on the bcm and the steering column connection. i know of one person who has done it and he said he would get back to me and never did lol.