Navigation wasn’t working when I purchased the car (used) the dealership said it needed a new radio, $600.00 to replace. Found one on eBay for a less. Installed it and put in the wrong code 3 times, message came up “ incorrect code- wait 30 minutes” , it wouldn’t reset , finally found out on a web site that the radio has to be left ON for 30 minutes. Then it reset with the correct radio code that I also found on a web site. Moral of the story.....get a new code for the new radio first