2010 Toyota Highlander Owners Manual - Page 420

3-7. Other interior features n The power outlet can be used when 12 V Vehicles without smart key system: The engine switch is in the "ACC" or "ON" position. Vehicles with smart key system: The "ENGINE START STOP" switch is in ACCESSORY or IGNITION ON mode. 115 VAC Vehicles without smart key system: The engine switch is in the "ON" position. Vehicles with smart key system: The "ENGINE START STOP" switch is in IGNITION ON mode. 394