Bluetooth is a low-range wireless technology, integrated into a lot of PCs and peripheral devices.
While I'm not sure what the Bluetooth does in the TL, I assume it ties your Bluetooth enabled PDA into your Cars integrated cellphone and navigation system.
Personally seems kinda useless to me; but to each their own. I refuse to talk on the phone while driving, and I don't use a navigation system. If I did either, it may be useful to have them integrated into my PDA.
I've got a Bluetooth system integrated into my Mazda6 that allows me to wirelessly access all systems accessible via a CAN port (which is a LOT) in real-time via my HP-1945 iPAQ. As it is now, it only scans. With a software upgrade in the works right now it will essentially allow you to tune your car wirelessly via your PDA.
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the TL is a lot bigger interior wise than the svt, I cant remember the interior dimensions of the 6 but I compared it to the contour.
Yeah, the TL is bigger than the SVT, but it's exactly the same as the 6.
Comparatively the 6 is quite a big bigger on the inside than the SVT is, so it follows that the TL being the same size as the 6, is bigger than the SVT as well.
A Contour is actually a lot smaller than most realize. A Mazda3 has the same interior dimensions as a Contour does.