yup, as it did in the C4, but on the new touch screen one it simply mutes the sound... and turns volume up or down.
There isn't an 'off' switch, bizarre eh ..
2016 DS4 1.6 HDI Blue Elegance EAT6 Ruby Red
2014 C4 (B7) Exclusive 1.6 Airdream EGS6 Hickory Brown
2011 C4 (B7) VTR 1.6 HDI Storm Grey
2007 C4 1.6 original Cool Hatch Grey
2004 Citroen Xsara 2.0 Hdi Blue