I have an 06 with clarion and the cockpit controls should have a speaker button. With or without that button, the clarion sound stays inside cabin (so you don't need a remote switch at helm). Only if you have optional amps and outside speakers does sound go outside. I have that stuff but still have to go inside to turn on amps. It's a screwy set up. In other words why would you want an exterior off on switch to control sound only heard inside? I wouldn't change anything unless or until you have exterior sound. In my stock 06 system I still have to turn something on both places to get sound in both places.