I installed the AVIC F90BT in my 2006 Chevy Avalanche.

 

I'm not using OnStar, but I'd like to be able to use the GPS signal from their antennae versus placing the Pioneer provided hockey puck in my windshield.

 

Has anyone done this successfully? I read a hack on a different site about soldering into the OnStar, blah, blah, blah...

 

But I'd like to be able to resell the truck at some point without having to explain what I did (and possibly backing all of it out).

 

Is there another way? Perhaps an RS232 cable conversion to fit into the back of the unit? I'd gladly buy it... Just point me in the right direction.