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PAC OS-2

2003 OnStar Interface (OS2) for Select 2000-2008 GM Vehicles

PAC
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• Plug and Play Interface That Allows Replacement Of GM Class 2 Factory Stereo
• While Keeping OnStar System
• OnStar Active LED And Ignition On LED For Visual Indication

Learn more about the os2

Good news and a little bad...

This item has been discontinued

But you may be interested in the newest model that's available.

os2x thumbnail

PAC OS--2X

OUR PRICE: $84.99

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Description


PAC brand icon

Authorized dealer

Product Features

  • Plug and Play Interface that allows replacement of a GM Class 2 Factory Stereo while keeping the OnStar system
  • Onboard Switching and amplification allows audio from the OnStar System to play through the two front factory speakers when OnStar is active
  • Will not disable the vehicle data bus, even if interface loses power
  • OnStar active LED and Ignition on LED for visual indication
  • Smart Sense Mute output to either mute the aftermarket radio or to turn it off when OnStar is active
  • Provides a 12V accessory output
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Compatibility List

  • Chevrolet:
    • 2000-2005 Impala
    • 2000-2005 Monte Carlo
    • 2002-2007 Trail Blazer (SLE)
    • 2002-2004 Trail Blazer (SLT) *
    • 2002-2007 Venture
    • 2002-2007 Uplander
    • 2003-2006 Tahoe
    • 2003-2006 Suburban
    • 2003-2006 Silverado
    • 2003-2006 Avalanche
    • 2003-2006 SSR *
    • 2005-2008 Corvette
    • 2005-2008 Colorado
    • 2007 Silverado (Classic)
  • GMC:
    • 2002-2007 Envoy (SLE)
    • 2002-2004 Envoy (SLT) *
    • 2003-2006 Yukon
    • 2003-2006 Sierra
    • 2003-2006 Denali (Sierra and Yukon) *
    • 2005-2008 Canyon
    • 2007 Sierra (Classic)
  • Buick:
    • 2002-2007 Rainier
    • 2002-2007 Terraza
  • Pontiac:
    • 2004-2007 Grand Prix
  • Cadillac:
    • 2003-2006 Escalade *
  • Hummer:
    • 2003 H2 *
    • 2005-2008 H3

* Note: If Premium Bose is bypassed.

Connections:

  • Yellow – 12V Constant
  • Red – 12V Accessory
  • Black - Ground
  • Orange – Dash Light Dimmer/Illumination
  • Green – Left Rear Speaker (+)
  • Green with Black Stripe Left Rear Speaker (-)
  • White – Left Front Speaker (+)
  • White with Black Stripe – Left Front Speaker (-)
  • Purple – Right Rear Speaker (+)
  • Purple with Black Stripe – Right Rear Speaker (-)
  • Gray – Right Front Speaker (+)
  • Gray with Black Stripe – Right Front Speaker (-)

Product history:

PAC OS2-X thumbnail
(newest, current model)
PAC OS-2C thumbnail
(previous model, replaced by PAC OS--2X)
PAC OS-2 thumbnail
(previous model, replaced by PAC OS-2C)

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Specifications & Details


Harness Features
Main Harness Function
Connect/Install an Aftermarket Car Stereo
Additional Harness Features
OnStar Retention
Premium Harness Features
On-Star Compatible
Yes
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

PAC

Model Number:

OS-2

Weight:

0.75lbs

Internal SKU:

os2

Internal Product ID:

5275

Customer Ratings & Reviews


PAC OS-2 thumbnail image

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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.