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PAC Audio GM/GMC/Holden Amplifier Integration Interface

Product Summary
Part Number: PACAP4-GM61
Barcode: 609099000000
Selected Part Number: PACAP4-GM61
General Product Information
Todays modern vehicle audio systems are becoming increasingly more sophisticated and complex. PAC engineered AmpPRO to dramatically simplify the installation of upgraded amplifiers in data-bus controlled amplified sound systems.

AmpPRO allows you to keep the original radio’s fit, finish, and features while giving you the freedom to improve the audio performance in record time!


  • Factory sound system upgrade
  • Time-saving design
  • Prevents the need for summing and audio correction devices
  • Reliable PAC quality


  • Upgrade solution for factory, fixed level, data-bus controlled sound systems
  • Time-saving design, prevents need for summing and audio correction devices
  • Variable volume, fade, balance, bass, mid, and treble audio settings
  • Retains OnStar, Bluetooth, navigation, safety systems, and all warning chimes
  • Front, rear, sub , and center channel preamp outputs (5 volt RMS)
  • Provides full range, flat audio output for a solid audio foundation
  • Customized OE bass, mid, and treble center frequency selection
  • MOST50 Integration
  • Plug-n-play installation
  • Remote sub level controller INCLUDED
  • Optional TOSLINK optical output INCLUDED

AmpPRO module
Bass knob
Knob harness

How It Works?

Product Compatibility Information
Plug & Play


Vehicle Plug Style

20PIN & 8PIN GM Style Connectors

Product Notes

Vehicle MUST HAVE BOSE factory sound system
Must have infotainment system RPO code IO5 or IO6 to be compatible.
To verify the “IO” RPO code on your vehicle, check the glove compartment for a silver sticker with these codes. If this sticker is not present, you must scan the QR code on the GM label found in the driver’s door jamb. The RPO codes will be listed in alphabetical order in either scenario.

RCA Pre-Outs

6 Channel Stereo

Optical Audio Out

Yes – Included with Interface