Quote Originally Posted by simbah View Post
He said that he was the Monsoon system which is an amplified system so the GMOS-01 will not work. What he needs is the GMOS -04

GM Factory Integration Adapter General Motors Class II data bus interface — retains OnStar system, factory door chime, and Bose system with aftermarket radio at Crutchfield.com
yea my bad, thought it was the gmos-01