Roger S. Renfro

Does anybody know which wires from radio harness goes to the steering wheel controls? I'm trying to hookup a pioneer touchscreen in my 2008 Silverado and I have the after market interface but I have splice into the steering wheel controls to get them to work w/ my pioneer radio and have no idea what color those wires are. Help would be much appreciated ,pictures would be fantastic too. Thanks a bunch in advance.