This iDatalink ADS-HRN(SR)-GMS05 wiring adapter from iDatalink allows you to connect a new car stereo in select 2006-up GM vehicles, working in conjunction with iDatalink's Maestro ADS-MRR module. Once connected, you'll retain the use of your steering wheel audio controls, your factory amp, safety warning chimes, and OnStar, if present.
The package includes connectors that plug in between the Maestro module, your GM radio's wiring plugs, and your new car stereo. You'll have to solder or splice together this harness's power/ground, illumination, speaker, and navigation output wires to the corresponding wires on your aftermarket receiver's wiring harness.
Installation note: This adapter must be used with the iDatalink Maestro ADS-MRR module to connect a new car stereo to your GM vehicle.