Scosche DCGMOS2B11B

GM OnStar Interface for Premium/Standard Bose Systems


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This item has been discontinued

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gmos2b11 thumbnail

Scosche GMOS2B11

OUR PRICE: $114.99

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Select 1999-2005 General Motors Vehicle Radio Replacement Interface. This harness Retains the GM Factory Onstar and Bose Systems in Select Vehicles. The Harness includes RCA low-level through-pass connections for superior sound quality and signal. Also provides +12V Switched Power Source for Aftermarket Stereo. Detailed instructions are included and toll-free technical support is available.

The Scosche DCGMOS2B11B is compatible with the following GM Vehicles that are WITH Bose and Onstar.

We also carry the harness for factory systems with NON-BOSE/BOSE AND NON OnStar. The item is Scosche GM09SR / GM09SRB

Retains door chimes and Vehicle Parking Assist chimes with the optional Scosche DCGMCM2B12B.

  • Select 1999-2005 GM Integration Harness for vehicles with Factory Bose systems and OnStar
  • 1-year Manufacturer's warranty
  • Buick:
    • 2004 - 2005 Rainier
    • 2005 Terraza
  • Cadillac:
    • 2003 - 2005 Escalade / ESV / EXT
  • Chevrolet:
    • 2003 - 2005 Avalanche
    • 2000 - 2005 Cavalier
    • 2004 - 2005 Colorado
    • 2001 - 2003 Malibu
    • 2000 - 2005 Monte Carlo
    • 2003 S-10 Blazer
    • 2003 - 2004 S-10 Pickup
    • 2003 - 2005 Silverado Pickup 1500, 2500HD, 3500HD
    • 2003 - 2005 Surburban
    • 2003 - 2005 Tahoe
    • 2002 - 2005 Trailblazer
    • 2005 Uplander
    • 2000 - 2001 Venture
  • GMC:
    • 2004 - 2005 Canyon
    • 2002 - 2005 Envoy
    • 2003 Sonoma
    • 2003 - 2005 Sierra 1500, 2500HD, 3500HD
  • Hummer:
    • 2003 - 2005 H2
  • Oldsmobile:
    • 2002 - 2004 Bravada
    • 2000 - 2001 Silhoutte
  • Pontiac:
    • 1999-2005 Grand Am
    • 2000 - 2001 Montana
    • 2005 Montana SV6
    • 2000 - 2005 Sunfire
  • Saturn:
    • 2005 Relay

Product History:

Scosche GMOS2B11 thumbnail
(newest, current model)
Scosche DCGMOS2B11B thumbnail
(previous model, replaced by Scosche GMOS2B11)

Harness Features

Vehicle Sound System
This refers to what kind of sound system the vehicle has. Premium audio systems are generally name brand systems (such as JBL, Bose, Rockford Fosgate, etc) that have been installed inside a vehicle when it leaves the factory. Often they more advanced systems, complex wiring, factory amplifiers, and other features that can make installing aftermarket component difficult.
Premium Sound
Main Harness Function
Different installations on different vehicles require different harnesses. This type is what the harness is considered. Each wiring harness we sell serves a purpose such as installing an aftermarket car stereo, integrating an aftermarket amplifier with your factory car stereo, connecting Bluetooth to your factory car stereo, and more.
Install a Car Stereo & Bypass the Factory OEM Amplifier
Additional Harness Features
The various features that the wiring harness provides to your car stereo and/or audio system.
Compatible Vehicle Make
Allows you to view only items that are compatible with your vehicle's make. Does not guarantee that it will work with your vehicle year or model.
Compatible Vehicle Make and Model
The model of vehicle that this vehicle specific product is designed for. Please keep in mind that engine variations can affect the compatibility of the products.

Premium Harness Features

Factory System Amplification
This refers to the factory sound system and whether the item is compatible with amplified or non-amplified systems.
Compatible Premium Audio Systems
Some vehicles have higher end audio systems installed in them by the manufacturer. This specifies which premium audio systems this item is compatible with.
Premium Bose
Standard Bose
On-Star Compatible
This means that the harness is compatible with vehicles that have On-Star built-in.
CAN-BUS Compatible
CANBUS Ballasts ensure compatibility with ALL vehicle makes and models without the need for additional accessories. In addition, they have built-in Anti-Flickering Capacitors to help prevent lighting issues caused by voltage spikes and drops by stabilizing the power.
GM-LAN Compatible
This means that the item is compatible with GM-LAN systems.
Chime Retention
This means that the harness is able to retain the vehicles chimes.


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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Birmingham, AL

Works as advertised

May 18, 2009

Installation was a snap. This device worked as advertised, unlike the other manufacturer's device out there. The only think it doesn't do is play the OEM warning chimes. I believe scosche has a separate device for that. Overall I would recommend this product.

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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Scosche DCGMOS2B11B

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Scosche DCGMOS2B11B

GM OnStar Interface for Premium/Standard Bose Systems


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