I have a 2012 CX-9, Grand Touring. I am not sure if my dimmer is working properly, or if I'm not using it properly. The panel lights are supposed to be bright during the day and dim at night and it's supposed to switch automatically. When I'm driving close to sunset, the instrument panel will switch from dim, but readable, to almost totally dark and barely readable. I can switch it back by pressing the knob, but shouldn't have to. FYI, I always drive with my headlight switch set to Auto. This has been going on from the day I bought the car new. I've taken it to the Mazda service department to have it fixed and for some reason I can't replicate the problem and neither can they. Does anyone else have this problem? I would really like to know about what controls this feature. Is there a light sensor that switches it from dim to bright and vice versa or does it switch when the headlights come on?