2011 Acura RL Owner's Manual - Page 285

Remote Audio Controls On all models except Hawaiian If you are listening to XM Radio, use the CH button to change channels. Each time you press the top ( ) of the button, the system goes to the next preset channel. Press the bottom ( ) to go back to the previous preset channel. To select a different channel of the category you are listening to, press and hold the top ( ) or bottom ( ) of the CH button until you hear a beep. Features 279