PAC OS-4 Aftermarket Radio Replacement Interface for 07-09 GM Cadillac Chevy W/ Bose OnStar (OS4)

Retains OnStar system functionality and the Bose factory-installed amplifier (if present) when the factory radio is replaced in a 29-bit GMLAN vehicle. Generates all safety warning chimes and audible turn signal indicators.

• Retains OnStar when the factory radio is replaced
• Retains Bose amplified audio system
• Provides all navigation radio trigger wires
• Chime module included
• Retains all safety warning chimes
• Antenna adaptor included
• Retains Bluetooth in 2009 models (if equipped)

• Click here for the OS-4 Instruction Manual
• Click here for the OS-4 Tech Brief - Preventing Engine Noise in Dual Zone Audio Mode
• Click here for the OS-4 Tech Brief - Displaying video on the far rear screen in the Cadillac Escalade

• Click here for the OS-4 Compatibility Chart