Features

Overview: The PAC OS-4 allows you to replace your vehicle's original factory radio with an upgraded aftermarket radio. It interfaces seamlessly with the vehicle's computer data bus system. The interface will maintain operation of the OnStar system in vehicles with Bose Audio Systems, amplified audio systems, and systems without amplifiers. The OS-4 has on-board switching that allows audio from the OnStar system to play through the two front factory speakers. All warning chimes, audible turn signals, Bluetooth, and the Vehicle Rear Parking Assist system (if equipped) will be retained.

Compatibility: The OS-4 is compatible with the following General Motors vehicles (as of 1/4/2012):

Compatibility Notes: When the OS-4 is installed, the following conditions will be applied:

• The OS-4 will retain the use of the factory-installed XM receiver. Factory RSE (rear-seat entertainment) controls must be present for this feature.
• This interface can be used to interface with the Bose amplifier even if the vehicle does not have OnStar.
• The interface will work in amplified or non-amplified audio systems.
• This interface retains the 5.1 audio system in equipped Cadillac vehicles.
• Built-in Smart Mute circuitry will play OnStar through the front speakers and allow the RSE audio jacks continue playing the audio source selected by the RSE controls.

Optional RSE Retention Harness: The GMRSAV RSE retention harness (120GMRSAV, sold separately) lets you retain the rear seat entertainment system in these select GM vehicles. The GMRSAV provides an audio/video input to the factory overhead video screen from your new aftermarket radio, and provides the audio/video output from the rear seat control panel to the aftermarket head unit.