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The nav feature is purchased separatly with the deck, the previous owner did not purchase it because at the time alpine was charging an extra $1000 on top of the price of the deck to add nav. This is due to the fact that alpine decided to use there own reasearch and development team to design a nav system where as kenwood baught the rights to use garmin's technology and put there name on it which they only charge $400 on top of the price of head unit to add nav.
I would suggest calling the police around the area you bought it from and see if anyone has reported their radio missing in their car. I don't buy things on Ebay "as Discribed", unless it comes from a reliable source (usually someone who has their own ebay store or warehouses). This is probably a radio that the guy broke into and stole out of someones car. Probably tried to use it and found out there was a lock code. If there has been one that has been reported as stolen within that area they will know a key code to turn it back on. Then send the police to pick up the guy and get your money back.
If the Police don't have any reports of stolen cars broken into and radios missing. I would suggest calling KenWood or checking with their site to find a way to reset this code. If you paid a lot for this product I don't see why anyone would be selling it AS IS. It sounds too Fishy for me.
If it is shutting off and coming right back on I would defintley take another look at your ground connection. This is the most likley cause for the sudden turn offs. Especially if it comes right back on.
Another solution here....I have a Kenwood KDC-x991 deck.
Have USB Read error problems..
Anyway I had a 30gb hdd, replaced it with a 100gb (according to manual, will use up to 120gb w/out external power...)
Anyways long story short, the 100gb drive worked fine for....20-25 mins...
I was happy. Now here's the clincher. After 20-25 mins, it gave the USB read error. (instead of resetting the deck and have to make the date/time/eq/sound/setting changes I unplugged the USB drive...changed source from USB to tuner (or anything else for that matter). Then switched back to USB w/ no device installed and after 2 seconds or less, the USB Error disappeard and said no USB device connected....Anyway thats the best way (I've found) to get around the Resetting the deck. Anyway after that from then on I could not get the Hard drive to work for more than 30 seconds. It would play then give me the read error.
Tried a different drive...80gb same prob...went back to the 30, and it was fine.
Tried a 160 (I knew it wasn't going to work) and it didn't either.
Anyway was thinking what to do.....most of the USB external drives I had came with a power port on it aside from the USB port plug. Or the drives came with the Y Cable....
The long part plugs into the Kenwood deck, and then the END of that cable plugs into your USB external drive, and the small piece connects to a (get this...here we gooooo FTW) USB to Cigarette adapter!!!!!
And this worked like a charm on ALL my drives. Stable...and just plain worked great!
Anyway I hope that this will help you guys w/ your usb probs!
In order to access the DNX7100's bulit in SD card slot, you have to press the CD/DVD eject button for about 5 secs. It will fold down to reveal the SD slot. This slot is only used for Software and Map updates via a SD Card.