It's called the Message Center, and it's very common for the LCD screens to fail. Mine had the same symptom when I bought it; replacement with new Message Center is the only viable option.
In TMS Parts check out Figure 15, Item 6. Part Number: MGA0011512
Ask Capt Rick if he has any in stock.
It's tight, but not complicated to remove it. From under the dash, access is to snake around and then above the in dash stereo. Get your hand(s) and wrench on the two nuts holding the backing clamp. Loosen those, and pull it free from the Dash front. Remove connector, and swap in new one with reverse order.
-WNF-