Just bought an 04 tl and having problems with the navigation. Occasionally it will reboot itself like there is a power connection problem. It seems to happen mostly when you go over a large bump. The other problem is the audio of the navigation. when you turn the sound out it sounds like when you turn on a tv and there is no signal and you have the snow picture, its the crackly sound that goes a long with it. Thats the best i can really describe it. We have replaced the navigation system and that did not fix anything. Obviously if you turn the audio of the navigation off, you dont hear it but I would like the voice navigation to work.

 

so i have been doing some more researching and found the rebooting might be due to a bad battery. Any thoughts on the audio issue?