That is an odd one. What I need you to try is to remove the fuse and see if anything happens. I want to see if we have a short to power at some point causing this.
The first two pics below show the wiring harness schematic for the radio. I highlighted the fuse. Pic 3 shows the fuse location in the box. The fuse panel is located under the instrument panel to the left of the steering wheel.
If this doesn't help, you really need to have the can-bus system scanned for codes related to the radio. CAN stands for controller area network. Basically, all modules/computers are tied together via a few wires. This type of scan will cover all modules, so if something is present it will show.
Here is a video showing the can-bus being scanned and how it's done:
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Thursday, April 22nd, 2021 AT 7:52 PM