2010 Toyota Highlander Owners Manual - Page 541

5-2. Steps to take in an emergency n If the tire pressure warning system is inoperative The tire pressure warning system will be disabled in the following conditions: (When the condition becomes normal, the system will work properly.) l If tires not equipped with tire pressure warning valves and transmit- ters are used. l If the ID code on the tire pressure warning valves and transmitters is not registered in the tire pressure warning computer. l If the tire inflation pressure is 73 psi (500 kPa, 5.1 kgf/cm2 or bar) or higher. The tire pressure warning system may be disabled in the following conditions: (When the condition becomes normal, the system will work properly.) l If electronic devices or facilities using similar radio wave frequencies are nearby. l If a radio set at similar frequencies is in use in the vehicle. l If a window tint that affects the radio wave signals is installed. l If there is a lot of snow or ice on the vehicle, in particular around the wheels or wheel housings. l If non-genuine Toyota wheels are used. (Even if you use Toyota wheels, the tire pressure warning system may not work properly with some types of tires.) l If tire chains are used. 5 When trouble arises Vehicles without compact spare tire l If the spare tire is in a location subject to poor radio wave signal reception. l If a large metallic object which can interfere with signal reception is put in the luggage room. 517