Did you know?The 2012 Chevy Avalanche has awesome 'Bluetooth' wireless technology for select phones. Lets you answer and end calls without touching your mobile phone.
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I'm not sure if your '02 has the same setup as my '04 but you may run into a white plastic connecting block mounted in the door itself. Check out my thread on adding rear door lights on an '04 and you'll see what I had to do to get more wires into the rear doors. http://www.chevyavalancheclub.com/index.php?action=articles;sa=view;article=32
When I bought my av I found someone had already tried to put in a stero system and didn't know what they where doing and the cut the rubber boots so waters getting into the door and I need to find a way to replace them if anyone can help me find a place to buy them that would be great