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PAC :: OS-2C :: $76.00


Item# 28653

OnStar Interface (OS2C) for Select 2000-2008 GM Vehicles

Sorry, this product is no longer available.

  • Vehicle Make: General Motors


General Features

  • Chime Module Included
  • Retains OnStar® when the factory radio is replaced
  • Retains Bose amplified audio system
  • Retains all safety warning chimes
  • Maintains a "healthy" status on the Class II databus
  • Plug-in installation for vehicles with 24-pin harness


  • 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 (-)


  • In "Premium" Amplified Systems only two input channels can be used from the aftermarket radio, therefore there will be no fading capability of the aftermarket stereo.
  • The CM-1 Chime Module is not required when used in conjunction with a Premium BOSE® amplifier. 
  • If you are not using the BOSE® amplifier, then the OS-2 and CM-1 modules are required.
  • Not compatible with 2009 vehicles that are equipped with O.E.M. Bluetooth.


  • Weight: 2
  • Authorized Internet Dealer
*Warranty: 1 Year Manufacturer warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to for replacement within 30 days from the original date of purchase with proper return authorization. After the 30 day time period, products must be returned to their original manufacturer for the remainder of the manufacturer's warranty period.