how to install a new cd player to my 2007avalanche?

Answer 1

The newest GM full-size SUVs and trucks use an all new type of LAN-bus system which the factory radio is part of. To replace the radio in these models you need a special module:

http://www.autotoys.com/x/cust/product.php?productid=9379

Note that you may need a different module if your vehicle is NOT equipped with Bose or Onstar. Scroll down the page for other options.