Lexus 2004 GX470 Owner's Manual page 98

Push the main switch once again to turn the power outlet off.
When the power outlet is not in use, make sure that the main
switch is turned off.
NOTICE
D To prevent the battery from being discharged, do not
use the power outlet longer than necessary when the
engine is not running.
D Close the power outlet lid when the power outlet is
not in use. Inserting a foreign object other than the
appropriate plug that fits the outlet may cause
electrical failure or short circuits.
INTERIOR EQUIPMENT
83