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Originally Posted by wai
connect to where in the headunit??? there is no input for volume adj or anything like that. even on a cars that comes with such controls if you change the head unit the controls are useless
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Alot of the alpine units have a small jack plug input in the rear for remote input, the trick is using the correct aftermarket adaptor to convert the signal into what the alpine will recognise, furthermore, there are also steering wheel interfaces that provide a transmitting eye that can be installed to operate units without hardwire input.
Most steering wheel controls are usually just basic switchs each with a different resistive value, so as to require as litte as one wire sometimes to convey the information of 6 or so buttons.
The buttons, interface and headunit are all nothing to sweat about, the trick will be to add the necessary extra contact(s) and brush(es) into the steering hub, that's the only real hurdle.
Just depends how much time and money you want to put into it.