Got one for someone that knows more about this than I do. When I have selected the rear defogger and I am driving slow in traffic it will 'time out' after about 10 min. or so and shut off...like it should. However, while driving on the highway, if you turn it on, it will remain on the whole time you are on the highway.
I have heard of other GM cars having a feature that over 80 km/h (50 mph) the RW defog is programed to stay on. Is that the case in the Bonne?
This is the only thing that I can think is causing this to happen. Otherwise...this sucker is going back while it is still under warranty.
Someone must know for sure...