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Recheck your connections on the kna-g510 and ensure it is getting power, not too familar with the kvt-819, but I've got the kvt -915 and when I pull up the screen, there is an icon right by the src icon, that looks like a wrench. Press that and find A/V interface and ensure that the navigation input is set to RGB, also you can back out and go to user interface and ensure the Navigation is set to auto intstead of manual. That may be the case if it is similar to the kvt -915.
Check the navigation setup and make sure the voice guidance is set to on. If it is, then the installer didn't catch the right wire for vss. Had the same problem, after getting my unit professionally installed, figured it was a problem with unit so I upgraded to the G510 and installed the DV4100 in my other vehicle myself, caught the right vss wire and now the unit works perfectly,displays turn by turn and gives voice guidance. Read previous solutions, they really help.
IF there is no route guidance it is because the unit is not receiving VSS information from the vehicle. Confirm that you are getting the VSS info from the correct source and or use Rostra Precision Control's cruise control guide to confirm your VSS wire.
Incidentally, I assume you're talking about the Kenwood KNA-DV4100?
Also, I assume this unit has come into your hands through legitimate sources. It is NOT an accusation when I mention that electronic equipment absent of an operator manual CAN have dubious origins. Again, this is NOT an accusation. Rather, it's always good to know where such a unit came from. When an owner's manual is missing, it raises a flag - unless, of course, you know and trust the person selling it to you.
At any rate, you can simply download a manual at Kenwood's website, below. Simply copy-and-paste into your internet browser's address bar: