I did something similar to the tutorial above. I purchased NavTool online and it was kind of pricey but worth it. Ran a back up camera to the nav and put a relay switch inbetween the seat heaters so I can turn it on/off at will, it also always comes on when I shift into reverse. Not very hard but did take a few hours only because of all the parts I had to remove and reinstall.
G/L
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'09 370Z Touring w/Sport & Nav 6-Speed Magnetic Black Persimmon HKS NAV Tool Backup Camera 35% Tint SOLD
2015 Jeep Grand Cherokee Altitude Dark Gray
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