I discovered shortly after I bought my (used) 2012 C 4 that I couldn't turn off the radio. The volume knob didn't push in to turn off. Not a big deal, but I mentioned it to the dealer and they ordered me a new replacement knob. In the meantime (thanks to a suggestion here), I just swapped the tuning knob over to the volume side and it's all fine. But I also discovered that the tuning knob side does push in – even with the broken knob – and not only that, it beeps when you push it. What is it supposed to be doing other than tune stations/change tracks? The Entune radio has a separate function for tone, balance, fader, etc., so it isn't doing that with the knob. Any ideas?
The tuning knob definitely does nothing but beep when you press it while listening to the radio. But there's a note in the manual that pushing the tuning button allows selecting from a list of tracks when playing a CD: "TUNE/SCROLL” knob: Turn this knob to select a desired track. Also, the knob can be used for selection from the list display." I've never played a CD in my car, but I wonder if this also works when playing tracks from a smartphone or USB player.
