A navigation unit that is failing can intermittently display a disc error on the screen.
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Navi works however when it is hot or warm inside the cab navi displays disk error. I have not fixed due to unable to fix.
i have same i have 04 titan my navi do not work
one day we turned the vehicle on and the "DISK ERROR" would come up on the screen and not load the maps anymore. I have not found a fix besides replacing the navigation system of the dvd unit.
Disc Error displayed no maps available.