hi i just put one of these into my 03 rex. you need a wiring harness to hook up the wires to the subaru end. you can purchase one through crutchfield. with that, you have to run the wires and do a lot of crimping and soldering.Originally Posted by Black_Rex
it IS necessary to have the parking brake wire hooked up to something, whether you just ground it or actually hook it up tot he brake, otherwise you can't enter addresses. the reverse wire i just ran because I had to run the GPS antenna anyway to the trunk, so I just ran the reverse along with it.