Have Toyota Questions? Ask a Mechanic for Answers ASAP
Thank you for trusting us with your questions. Was there anything that preceded this happening, such as battery changed or anything else? Does the line move across the screen? Does it say 'loading please do not turn off power'?
Unfortunately, sounds like there is a malfunction with the head unit itself. There is 1 thing to try, though. Disconnect the battery for minimum 30 minutes. This allows all the capacitors to discharge and completely drain all power from the unit. This is the only way to perform a hard reset and start over. If that does not work, you will need to replace the head unit. Depending on your mileage, it could still be under warranty. If not, you don't need to buy a new unit as there is an exchange program through the dealer parts department that significantly reduces the cost.
I work at a busy toyota dealership and have only seen this a few times. It's not really very common considering the number of vehicles on the road. There are a couple possible causes for it. One is a 'system' malfunction, just like a computer that has an issue with a memory chip or hard drive. The other is an actual mechanical issue such as a pinched or rubbed wire inside the unit. Unfortunately, these units aren't made by Toyota, but by outside vendors and therefore they will not let us open them up to work on the inside. Which is why they have the exchange program.