Have an '06 Prius, 154,000+ on it... A set of controls on the right hand side of the steering wheel have just quit functioning... controls the windshield defrost, the rear window & mirror defrosters and the inside/outside air circulation. Before I go tearing into the steering column (found a posting on here that explains how to dismantle things), I'd kinda like to have a clue as to what is in there and, if anyone else has had this problem, where the problem is likely to be... The on-screen controls work just fine for all 3 functions, but it's a pain (and dangerous) to be switching screen views to change the settings... right now in N. IL the harvest season is starting, and while driving down the road, there can be places where the road is entirely obscured by the soybean or corn dust, and unless you change the air-flow, the inside of the car & your lungs are also filled with said dust!! Cough, hack... I'm a farm boy, but still don't wanna eat any more dust than I have to!! Plus, in the right weather conditions, the inside of the windshield can fog over in seconds, and while driving that button on the steering wheel is NICE!!