• Chevrolet Express vans & GMC Savannah vans equipped with diesel engines are not compatible
• In order to retain the factory XM tuner the aftermarket head unit MUST be equipped with an auxiliary input
• In order to retain the factory XM tuner the vehicle must be equipped with steering wheel controls and a driver information center

Current Revision #: 1.2.3.8b   Description: Adds memory seat chime

               Revision #: 1.2.3.8      Description: Adds factory XM radio retention through SWC & DIC

               Revision #: 1.2.3.4a    Description: Remedies issues with "turn by turn" navigation in the Enclave & Vue

               Revision #: 1.2.3.3b    Description: Initial Release

• Retains OnStar® when the factory radio is replaced
• Retains Factory Bluetooth (2009-2010) model vehicles)
• Retains rear seat audio controls
• Retains factory XM
• Retains all warning chimes (chime module included)
• Retains back-up sensors/park assist
• Retains factory BOSE audio systems
• Retains factory premium BOSE audio (Y91 digital)
• Supports non-amplified audio systems
• Steering wheel control harness (pre-wired)
• Dual zone function
• Chime volume adjustment (factory buttons)
• Rear seat audio and video (GMRVD) required
• OnStar volume adjustment
• Retained accessory power output (R.A.P.)
• Reverse Wire output
• VSS (Vehicle Speed Sense) output
• Illumination output
• Parking brake output
• Includes antenna adaptor

These features are now available with revision 1.2.3.8:

• XM Text displayed in the Driver Information Center (cluster display)
• Retains lane departure warning system
• Retains OnStar Turn-By-Turn voice prompts

• Please click here for the OS-4 Instruction Manual (rev 1.2.3.8 or higher)

  Please click here for the OS-4 Instruction Manual (rev 1.2.3.4a ONLY)
  

• OS-4 Tech Brief - Preventing engine noise in "Dual-Zone" audio mode

  OS-4 Tech Brief - Displaying video on the far rear screen in the Cadillac Escalade