So I recently picked up a 04 TL with Navi. It was bought stock and I haven't added or changed anything for this little problem to occur. I noticed that when I have my nav screen on and I have the stereo volume up to 30+, the screen gets these fuzzy black lines when the bass hits. It seems as if the stock 8" in the back is drawing too much power, or there's a problem with something else.

I tried searching for an answer, but to no avail. Has anyone ever heard of this problem or noticed it with their rides?

 

I have an 08 tl, i seen those wavy lines as well on mine. It didnt bother me as much and they're there most the time with or without the radio on. Not sure if its the same as you're talking about but since i had an aftermarket amp installed at best buy they messed up the radio fuse pins on the back of the fuse box so the factory radio couldnt get power to turn on. So they spliced somewhere else in my car to draw the 12volts in for the radio and i havent noticed it since then. I'll check again later when i get in my car to confirm for you.

 

Thanks I appreciate it! I have a feeling it's nothing, but I just wanted to make sure it wasn't going to lead to a bigger problem if I swapped on the stock sub and amp.