PAC's OS-1 OnStar interface will plug into General Motors factory harness without having to cut or splice into the factory plug. The plug and play feature of the OS-1 will also interface directly with a factory equipped Bose sound systems when used with the PAC's OEM-1 premium sound system interface. The OS-1 incorporates a microcontroller that communicates directly with OnStar's serial data protocal to prevent false triggering thus eliminating unwanted audio noise through speakers. Onboard amplifier will drive two, 4 ohm speakers in stereo. Use with existing speakers in front doors or use external/separate speakers. 12 volt remote out to turn on factory amplifier and mute wire to attenuate the aftermarket stereo. LED indicator and volume control. Built in audio isolation circuit eliminates engine noise. Will not false trigger.

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On May-07-09 at 15:16:19 PDT, seller added the following information: