PAC Audio car electronics accessory

Radio Replacement Interface

The PAC OS2X is a radio replacement interface designed for select General Motors Class II vehicles. It allows installation of an aftermarket head unit while keeping factory OnStar functionality and all safety warning chimes. The module also retains the Bose amplified audio system when equipped and supports rear seat entertainment and rear seat audio controls. Installers gain a plug-in connection for a steering wheel interface module sold separately.

Class II Databus Constraints

The interface maintains a healthy status on the vehicle's Class II databus and provides a 10 amp 12 volt accessory output for the new radio. Firmware updates are performed in the field via USB to ensure ongoing compatibility. A chime module with four level adjustability is included to reproduce factory warning sounds through the aftermarket system. Navigation radio ready design supports factory navigation features where applicable.

24 Pin Harness Compatibility

Plug-in installation is limited to vehicles equipped with the 24 pin factory harness, so vehicles with a different connector cannot use this interface directly. OnStar retention and chime generation cover the primary factory features, yet the module does not add features the vehicle never had, such as satellite radio or Bluetooth streaming. The steering wheel control input requires a separate SWI module, leaving that function unavailable without the extra purchase.