Expensive but necessary item if you want to retain sounds / onstar
2012 Chevrolet Colorado
Crutchfield Customer Review (What's this?)
It worked well to retain the alerts and onstar stuff. The install was not easy as the instructions are detailed but the plugs are not well marked. I ended up plugging the SWC into the Access unit as there was not an easy way to know what plugs into what end of the GMOS. (Yes, it actually fits into both ends) At one point I had the radio hooked up and working. But when the car was moving above 10 MPH the radio would turn off. This lead me to the incorrect plug in the adapter. After calling Crutchfield technical support, it was clear I had wired up the incorrect plug. They were very helpful and knowledgeable. Also it would have been nice to have ISO plugs that plugged directly into the GMOS-01 and radio, then we would only have to splice / join wires a few things instead of all the wires. For the price it should be easy.
Pros: When wired up properly works as expected.
Cons: Instructions could be much better, plugs could be marked better (A,B,C) and where they plug in could be marked (A,B,C), It would be nice to have ISO connectors included.