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13 Mar 2017 Installation instructions for part GMOS-04 . Adjustment section for further instructions. . steering wheel to raise or lower the OnStar level. GMOS-04. GM Data Interface 2000-2013. MSRP: $136.00 USD. Product Features; Tech Docs & Instructions; Vehicle Applications. Provides accessory power 3 Feb 2013 INSTALLATION INSTRUCTIONS FOR PART INSTGMOS-04. REV. 12/21/11 GMOS-04 interface • 16-pin harness with stripped leads. 18-pin harness to 12- Installation Instructions ONSTAR SYSTEM, THE GMOS-04 WILL ALSO RETAIN THE . the potentiometer counterclockwise will increase the chime level. 6. INSTALLATION INSTRUCTIONS FOR PART GMOS-04. CAUTION: Metra . counterclockwise (all the way left), then clockwise to raise chime level and. Metra also has the GMOS-04 unit HERE that does do the BOSE amp, but it .. If you read the fine print in the install instructions GMOS-100 (page 3, . There is a major increase in alternator whine, and RAP function works but3 Feb 2013 FREE 2-day Shipping: Metra's GMOS-04 GM radio replacement interface lets you replace the factory radio in select OnStar-equipped 2000-up GM vehicles.