2010 Toyota Highlander Owners Manual - Page 553

5-2. Steps to take in an emergency STEP 3 To change "POWER" switch modes: Within 5 seconds of the buzzer sounding, release the brake pedal and press the "POWER" switch. Modes can be changed each time the switch is pressed. (→P. 183) To start the hybrid system: Press the "POWER" switch within 5 seconds after the buzzer sounds, keeping the brake pedal depressed. In the event that the hybrid system still cannot be operated, contact your Toyota dealer.