Ice Possible display

[a04h2]

the temp displayed mirror has only a two wire circuit that runs to an ambient temp sensor. a little electrical lesson heat causes resistance, cooler temp has less resistance. voltage goes to path with less resistance, causing less heat, showing ice display. so one of the two wires is connected to something it doesn't need to be or it could be grounding out some place in the positive wire going to the temp sensor, u said it flashes ice while driving.