Hi John. I assume youre looking for a non-messy way to use your I-touch.i.e. you dont want wires all over the inside of the car. The only way to do it is to try to find a mcintosh/ipod interface cable that plugs into the changer control on the rear of the unit. I've had a look online and cant find one. Even if one can be found it most likely wont charge the IPOD,apple have made some changes that prevent other manufacturers products from charging theirs. However some ICE manufacturers(Alpine being one) have made a "dongle" to get around this problem,so I assume all manufacturers will follow suit. Your other option is to use the AUX function on your unit-a simple 3.5mm male to male cable will do this,but again no charging and the cable is a little messy looking. Essentially changing your head unit isn't an option due to your climate control being part of it-it can be done but only with a facia adaptor from Subaru which is prohibitively expensive(see Dans post above). I would not recommend chopping wires to try and hard wire-it prob wont work and could easily cause fires.