Citroen C4: Steering-mounted controls

Voice control: smartphone voice commands.

Increase volume.

Decrease volume.

Mute by pressing the volume increase and decrease buttons simultaneously (depending on equipment).

Restore the sound by pressing one of the two volume buttons.

Telephone (short press): start telephone call.

Call in progress (short press): access telephone menu.

Telephone (long press): reject an incoming call, end call; when no call is in progress, access telephone menu.

Radio (rotate): automatic search for the previous/next station.

Media (rotate): previous/next track, move through a list.

Short press: confirm a selection; if nothing selected, access presets.

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