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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by GMPartsGuy:
Dealerships HATE aftermarket electronics on vehicles under warranty. Especially if it is installed without regard to vehicle schematics. Typically, self installers will splice into system critical power feeds causing all kinds of problems with modules and resistance values. </div></BLOCKQUOTE>

I have to totally agree with that. Aftermarket installations can be a nightmare for dealers. They don't have the schematics, have no idea how the installer did the connection, etc.
When in the field a few years ago, this was a big problem. Customers would install items by cutting and splicing, and the splicer were not tight, and all sorts of problems would arise, and many had a hard time understanding why GM would not back this under warranty.
Not saying yours was not installed correctly, since I can't see how it was installed.
I will also mention that some of the worse installations I have seen were from BestBuy and Circuit City, while the best installs were usually done by a small shop with knowledgeable technicians.