Lexus 2013 GS 350 Owner's Manual page 451

Using the rear seat audio controls
Some front audio features can be controlled from the rear seats.
Display
1
Power on/off
2
Selecting an audio source
3
GS350_U (OM30C34U)
5-3. Using the audio system
Volume up/down
4
Selecting a track or file etc.
5
Selecting a preset station or
6
folder etc.
I n f o r ma t i o n P r o v i d e d b y :
5
: If equipped