2013 Toyota Sequoia Owners Manual - Page 202

2-4. Using other driving systems ● The shape of the obstacle may prevent a sensor from detecting it. Pay particular attention to the following obstacles Wires, fences, ropes, etc. Cotton, snow and other materials that absorb sound waves Sharply-angled objects Low obstacles Tall obstacles with upper sections projecting outwards in the direction of your vehicle • A person near the vehicle (depending on the type of clothes worn) • When the bumper is damaged.