Lexus GX470 2004 Owner's Manual page 516

NOTICE
D Once the emergency button is pushed, an emergency
call cannot be cancelled.
D This system is only operational in GPS and analog
cellular coverage areas.
expiration, all Lexus Link services (i.e. automatic
notification, emergency call functions, service call
functions, door locking/unlocking function) are
deactivated.
Upon subscription
IN CASE OF AN EMERGENCY
499