I have a very late 1999 DSE with the factory Alpine Radio. The cars steering wheel did not have volume controls or 'skip' functions on it. I've subsequently fitted a genuine higher spec part wood wheel that does have these functions. Is it possible to 'activate' these functions or would I need more retrofitting of cabling as the buttons do not work? Any thoughts?

The wiring between the rotary coupler and the rest of the car should be there. It is on mine and that was supplied new without a radio and a steering wheel with no buttons at all. It carries the wiring for the horn on mine and also carries the signals for the cruise control too if you have that. It should appear on a Grey/Orange wire at pin 2 of the Grey connector on the back of the radio.