Lexus GS 450h2011 Manual page 346

3-4. Using the hands-free system (for cellular phone)
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
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GS_HV_U (OM30C14U)
June 2, 2010 10:30 am
Connection status
Battery charge
Call area
Signal strength
Conditions
Blue: Good
Yellow: Bad
: Not connected
Full
"Rm": Roaming area
"Hm": Home area
Excellent
Empty
Poor