I am switching over my alpine head unit from a 2002 facelift discovery 2. My new modern alpine unit accepts the two original connectors and the main aerial thereby allowing it to power up and work. There are a further 3 separate connect blocks on the unit , far left if you are looking direct on at the unit, which I have no where for them to connect to. I notice that the sub does not work either. Any help would be appreciated. I,m not even thinking about the steering wheel connections yet, could this be them?