Yup. Just tried it. At my house it searches for the tires for a minute and apparently finds the winter tyres from the garage 3-4 meters (and 2 walls) away. And the light turns off. Nothing in the glove box though. So the way I see it: a summer tires are not programmed in b summer tires are under inflated (the limit is 2,5 bar?) c something is broken d Prius only holds data for 4 or 5 tires e I'm an idiot aaargh... I hate these. This is my third prius and the whole point of having one is to go the dealership only once a year for an oil change.