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Small black rectangular interface module with multiple wire connectors and a dock port

PAC Audio

PAC RP3-GM13 Radio Replacement Interface

SKU CH-2TNE-PR0XK

Radio replacement interface for select GM vehicles without OnStar, retaining factory amplifier and steering-wheel controls via plug-in module

  • TypeRadio Replacement Interfaces
  • Retains factory amplifier when equipped
  • Data-controlled navigation outputs for speed, reverse and E-brake
  • Plug-in steering wheel control module connection
  • Adjustable chime volume with four settings
  • USB firmware updates via PAC-UP adapter

RadioPro3 Interface for GM Vehicles

The PAC RP3-GM13 RadioPro3 Replacement Interface lets you install an aftermarket navigation radio in select General Motors vehicles that use the Class II databus and lack OnStar. It is designed for owners who want modern head-unit features while keeping the factory amplifier and vehicle data-bus communication intact.

Plug-in harness and databus retention

The interface connects through the vehicle's existing harness dock and maintains the Class II databus so dealer service tools continue to function. It provides data-controlled outputs for speed, reverse and parking-brake signals to the new radio, plus a retained accessory power output. Steering-wheel control modules such as the SWI-RC or SWI-X plug directly into the unit.

Replaces the factory radio without losing chimes

This unit replaces the original head unit while preserving audible chimes with adjustable volume levels including an off setting. The jump is worthwhile when you need navigation, smartphone integration or expanded media sources but must keep the factory amplifier and databus integrity for diagnostics and safety systems. Buyers who require OnStar retention or have a different databus architecture cannot use this interface.

Highlights

  • Retains factory amplifier when equipped
  • Data-controlled navigation outputs for speed, reverse and E-brake
  • Plug-in steering wheel control module connection
  • Adjustable chime volume with four settings
  • USB firmware updates via PAC-UP adapter

Specifications

BrandPAC
TypeRadio Replacement Interfaces

Questions about this item

Which PAC RadioPro3 interface fits a GM vehicle without OnStar?

The RP3-GM13 is built for select GM models that use the Class II databus and do not have OnStar, providing a direct plug-in replacement for the factory radio.

What vehicle data does the interface supply to an aftermarket navigation radio?

It outputs speed, reverse and parking-brake status over data-controlled wires so the navigation unit can use real-time vehicle information.

How does the Class II databus connection affect steering-wheel controls and chimes?

The interface keeps the factory databus active, supports a plug-in steering-wheel control module, and lets you set chime volume to low, medium, high or off.

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