Hmm.. system remote control.. Well, the buttons on your steering wheel actually control your cruise control system, not your audio like other (newer) cars.
Where is this system remote control you're talking about? Are these wires coming out of the mustang or your pioneer stereo?
And you're very welcome! I'm glad you took the time to read it all.
2000 Mustang GT
My pride and joy, my first car ever. Bought on 6/2/2013.
Check it out at my channel here: youtube.com/mustangfanatic95
Expect more vids in the Spring: Car shows, cruises, fly-bys, etc.