2005 RL

Over the past 3/4 days, my outside temperature display shows --- instead of the temperature. I've read several threads, but can't figure out what the issue is. One thread suggested changing the fuse, but I can't determine which one. In addition, where is the sensor located, and is there a DIY to replace it? I couldn't find one.

Thanks

 

The sensor is located right behind the lower grille. Sounds like it's not getting a reading or disconnected.