More then likely the navi unit under the front seat has failed. When it is not working the circuit board on the unit has an open on it. I think the only way that is going to repair this is to replace that unit.
I attached the wiring diagram below and we need to test the wiring coming from the unit to the display unit.
Here is a guide that will help with this:
https://www.2carpros.com/articles/how-to-check-wiring
Also, I attached this info below that you will need for this if this proves out and needs replaced. Please let us know what questions you have.
Images (Click to make bigger)
SPONSORED LINKS
Monday, January 18th, 2021 AT 4:17 PM