Lexus GS460 Owner's Manual page 333

Status display
You can check indicators such as signal strength and battery charge on
the "Phone" screen.
Indicators
Connection status
Battery charge
Call area
Signal strength
GS_G_U (OM30C11U)
May 21, 2010 1:06 pm
3-4. Using the hands-free system (for cellular phone)
Connection status
Battery charge
Call area
Signal strength
Conditions
Blue: Good
Yellow: Bad
: Not connected
Full
"Rm": Roaming area
"Hm": Home area
Excellent
3
Empty
Poor
333