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Small black rectangular interface module with 24-pin connector and multiple wire leads

PAC Audio

PAC RP3-GM11 Radio Replacement Interface w/SWC

SKU CH-KX1K-WRC27

Radio replacement interface retains factory amplifier and steering-wheel controls for GM Class II vehicles with 24-pin harness

  • Retains factory amplifier for original sound quality
  • 10A accessory output powers aftermarket devices reliably
  • Adjustable chime volume with four levels and off
  • Data-controlled speed, reverse and e-brake outputs for navigation integration
  • Plug-in steering wheel control module connection preserves factory buttons

GM Class II radio interface

The PAC RP3GM11 replaces the factory head unit in GM vehicles that use a Class II databus and a 24-pin harness. It supplies a 10A accessory output and data-driven speed, reverse and E-brake signals for a navigation radio. Steering wheel control modules plug in directly, and the factory amplifier remains active.

Sustained operation with databus intact

The interface keeps the vehicle data-bus live for service and diagnostics while the aftermarket radio runs. A data-controlled RAP accessory output stays powered according to the vehicle’s retained-accessory-power logic. Chime volume is adjustable across four levels or can be muted completely.

Replaces the OEM radio without losing amplifier

This unit upgrades from the factory radio when you need modern sources but must keep the standard or premium amplifier and steering wheel controls. The jump is worth it when the vehicle uses the Class II databus and 24-pin connector; vehicles with OnStar or a different databus are not supported.

Highlights

  • Retains factory amplifier for original sound quality
  • 10A accessory output powers aftermarket devices reliably
  • Adjustable chime volume with four levels and off
  • Data-controlled speed, reverse and e-brake outputs for navigation integration
  • Plug-in steering wheel control module connection preserves factory buttons

Specifications

BrandPAC

Questions about this item

Does the 10 A accessory output stay on without draining the battery during all-day use?

The interface provides a data-controlled RAP accessory output rated at 10 A that follows the vehicle's retained-accessory-power logic, so it shuts down with the car and does not draw constant current.

Which steering-wheel-control module must I already own to use the plug-in connection?

You need a PAC SWI-RC or SWI-X module; the interface has a dedicated plug-in port for either one.

Will the Class II databus and 24-pin harness keep my factory amplifier working after installation?

Yes, the interface retains both standard and premium factory amplifiers while keeping the vehicle data-bus intact for service.

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