If your model can switch car icons, you do it through Home. Add maps/voices, etc. and move to the screen for car icons. Select the ones you want and dl them and install. Then in the unit itself, you change preference-->car icon and select the one you want to switch to.
If you've gotten that far, remember the car icon is only visible when the map is in 3D view. In 2D view, you only see the default blue arrow.
If there's one you like that you saw in the car icon forum here, download it and place it (using Explorer to copy it from where you've saved it on your pc) to your tt unit in the sub folder 'cars' in the folder 'art' in your unit.
If those folders aren't there, create them using Explorer (all lower case and no quotes for the folder names).
Again, if you can switch icons with your model, select Change Preferences-->Change Car Symbol.
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