Join Date: Apr 2009
Location: San Bernardino, Ca.
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These cars don't work that way. The only adapter(s) you need on these cars is one to connect the aftermarket unit to the harness, and one for the antenna. Also, if you want, there is a kit for the steering wheel controls if your aftermarket unit has a provision for them.
2005 Pontaic GTO - CGM 6 Speed (My car)
2017 Chevrolet Colorado 2WT (My daily driver)
2010 Mercedes Benz C300 Sedan (Wife's car)
2014 Kia Rio LX (Wife's daily driver)