Rear view mirror temp. display

My rear view mirror outside temp display is showing OC, can anyone clue me in on what this might mean? My compass is ok. I didn't know if the OC meant out of calibration for some odd reason, or if it meant an open circut in the temp display system.
Thank you for the help,
Matt

You got it. It means open circuit. Usually means the temp probe is shot. IIRC, it's behind the grille, near the battery.

Joel