I tried to get the Avic-D1 installed last friday. I found out that I will need a tuner, and the Onstar connection. I checked ebay and got the nav traffic tuner for $114 (normally $330). The Onstar connection is the Onstar/Monsoon adapter OS4, but I've only found one company that sells it. I'm not sure if the OS1 or OS2 will work with out splicing wires. Check out 12volts warehouse for deals on the Avic-D1. I got it for $1065 with $300 rebate.
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