RadioPRO Advanced Interface for General Motors Vehicles

$309.00 GM3A-RSTX
Radio Installation Adapter For Select General Motors Vehicles With OnStar, GM LAN 29-Bit Data-bus with 14-pin and 16-pin harnesses
  • 2012+ GM trucks and SUVs equipped with factory navigation radios require the RP5-GM32
  • 2014+ Silverado and Sierra: Only compatible with 2500 & 3500 series trucks with non-navigation radios. 1500 series must use the RP5-GM51. 2500 & 3500 series trucks with navigation radios must use the RP5-GM32
  • In Premium Amplified Systems there will be no fading capability of the aftermarket stereo.
  • Chevrolet Express vans & GMC Savannah vans equipped with diesel engines are not compatible
  • Does not retain escalating tones of parking sensor proximity
  • Does not retain lane departure or forward collision warning tones


RadioPRO Advanced Interface for General Motors Vehicles


Installation Instructions

It is VERY important that you use the latest version of Interface Updater. Not doing so may damage the interfaces software. 

Detailed Instructions

  • If this is the first time, download and install "PAC-UP Interface Updater". This will install the necessary software to update the firmware on the RP Interface. This can be found at in the "Download" tab at the very bottom of the firmware list on this page.
  • Download the firmware file to a location on your computer that you can easily find.
  • Open the Interface Updater Program by going to Start >All Programs >AAMP of America > Interface Updater.
  • Connect the PAC-UP to the computer using supplied USB cable. Connect the PAC-UP to the RP Interface.
  • Click the "Connect" button to establish connection between the PAC-UP and the computer. The "Connected" check box will be checked if successful. If unsuccessful, disconnect the PAC-UP from the computer, restart the software, then reconnect the PAC-UP and try again.
  • Select your RP Interface from the "Interface select" pull down menu.
  • Click "Update firmware". The new firmware can be found where you saved it before beginning.
  • Once the files are chosen the update will begin. When successful it will show the text "End Update".

IMPORTANT: It is very important that the second from last digit of the revision number on your module matches the second from last digit of the new firmware file revision number. If your numbers do not match, please contact our tech support department.

  • Firmware Download, Version (Released on May 30th, 2023)
    Release Notes

    ***No download available, hardware update only***

    • Minor hardware change. No user functionality affected.
  • Firmware Download, Version (Released on April 22nd, 2022)
    Release Notes

    ***No download available, hardware update only***

    • Changed GM3A-RSTX to new hardware platform (rectangular housing). Includes the following improvements:
      • 10a Accessory Output through onboard relay
      • Direct USB connectivity
  • Firmware Download, Version (Released on July 1st, 2019)
    Release Notes
    • Changed RP5RADPWRAUDIO-HAR to GM-RAD-HAR. Harness includes the following updates:
      • Shortened chime cable
      • Removed blue power antenna input
      • Extended harness length by 2"
      • Removed constant 12v and ground connections from relay to module

    ***No download available, harness update only***

  • Firmware Download, Version (Released on October 15th, 2018)
    Release Notes

    Initial release

    ***No Download Available. This is just a revision history.***


Easily upgrade a vehicle’s radio without losing OnStar and other factory features with PAC’s RadioPRO Advanced Radio Installation Adapter.

RadioPRO Advanced has been engineered to save you time and seamlessly integrate into a vehicle’s databus system to retain features such as OnStar, steering wheel controls, factory amplifier, rear-seat entertainment system, and warning chimes.

Key Features

  • OnStar retention
  • Steering wheel control retention
  • Warning chime module included
  • Bose amplifier retention (Standard and Premium)
  • Rear-seat entertainment system retention (GMRVD required)
  • Retains factory Bluetooth (2009+ model vehicles)
  • In-field firmware updatable (PAC-UP required)
  • Antenna Adapter included
  • Factory USB port retention cable included
  • Dual Zone function
  • Retains back-up sensors/park assist and back up camera signal
  • Retains rear seat audio controls


  • Easier installation
  • Improved factory feature retention
  • PAC quality and reliability

Patent # 8,014,540 & 8,184,825

GM3A-RSTX Instructions
*** Applies to rev only!***
 Download (1.24M)
GM3A-RSTX Instruction Manual
***Applies to rev or earlier***
 Download (946.83k)
Loss of Accessory Power
Tech bulletin for no accessory power output - Bypassing the module with the speaker wires. This tech brief only applies to modules that are blue.
 Download (1.63M)