Lexus 2013 GS 350 Owner's Manual page 420

5-3. Using the audio system
Status display
You can check such indicators as signal strength and battery charge on
the screen.
Connection status
1
Battery charge
2
Indicators
Connection status
Battery charge
GS350_U (OM30C34U)
Conditions
Good
Full
I n f o r ma t i o n P r o v i d e d b y :
No
connection
Empty