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Is it the Navigation unit in the trunk that has gone bad? Or has your display unit given up? You can find plenty of Navigation units and display screens on ebay.
If it's just the display you can purchase a replacement screen. Search 2000 acura tl navigation screen or Navigation Display on ebay. you'll find plenty of them there. The real fun is removing your old one, to replace with the new one you bought to fix the problem.
To remove and replace the screen, you need to remove everything below it first. Search youtube videos and you'll find some very detailed instructional videos on how to do it. It's not for the faint of heart, or the mechanically inept...
I've done it, and YES.... you need to removed all of that stuff, in that exact order, in order to be able to get to the two lower bolts that hold the screen in place. There is no short cut.
Helpfull hint... before you install your new replacement screen, be sure and write down the serial number of the unit, which is printed on the back side of the assembly. You just might need it some time in the future (like when you need it to retrieve a code from Acura USA, to make your radio and nav unit work after disconnecting the battery)
My wife has the Lexus IS250 with Navigation and just this morning she tells me she wanted to raise the AC from Low to higher position, but that nothing on the Navigation screen is working. I tried what David mentions above, but the only fuse that had 15A on it was in xlnt condition. Any other suggestions? Dealer talks like $1500 and the system has always been mediocre at best. Thanks for any help.
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.
it seems to me that they have installed something incorrectly and that it is interfering with your nav,ring the company to see if they are compatible to work together. if they are then they need to check they have installed it correctly. hope this helps