PAC RP5-GM31 radio replacement interface for GM LAN vehicles — Blue housing, OnStar & steering wheel control retention

The PAC RP5-GM31 is a plug-and-play radio replacement interface that preserves OnStar, steering wheel controls, factory Bluetooth and navigation outputs when upgrading the head unit in select GM LAN vehicles.

Swapping an aftermarket head unit into compatible GM vehicles often disables key factory systems. The RP5-GM31 solves that by bridging the vehicle's LAN network and radio harness so you can add modern audio gear while keeping essential features like OnStar, rear-seat audio control and steering wheel commands operational. Finished in a compact blue housing (8.60" x 8.50" x 2.10"), this PAC interface is designed for installers who want a reliable, OEM-like integration without complex rewiring.

How does the RP5-GM31 keep OnStar active after replacing the factory radio?

Instead of relying on the original radio for OnStar data, the RP5-GM31 maintains the vehicle's network communication and power pathways that OnStar needs. It intercepts and routes the necessary signals so the OnStar module continues to function as if the factory head unit remained installed.

• Preserves OnStar connectivity when fitting aftermarket radios
• Interfaces with the vehicle LAN to pass required data
• No loss of OnStar features tied to factory wiring

Will steering wheel controls and factory Bluetooth still work with a new stereo?

Yes — the RP5-GM31 retains both steering wheel audio controls and the vehicle’s original Bluetooth system on compatible 2009 and newer models. It translates the control commands to the aftermarket radio so volume, track and call controls remain intuitive.

• Steering wheel control retention for common audio functions
• Retains factory Bluetooth in many 2009+ GM models
• Compatible with head units that accept external control signals

What navigation and auxiliary outputs does this interface provide?

The RP5-GM31 supplies navigation outputs and other auxiliary signals needed by many aftermarket head units. It exposes reverse, illumination and parking brake outputs along with navigation lines, enabling safe and compliant installation of video and navigation equipment.

• Navigation output lines for aftermarket GPS systems
• Reverse wire output for camera trigger integration
• Illumination and parking brake outputs for display control

What vehicle functions related to passenger convenience are preserved?

Beyond core connectivity, the interface keeps rear-seat audio control and dual-zone operation intact when supported by the original vehicle configuration. That means passengers can still adjust audio functions, and dual-zone climate/audio separation is retained where applicable.

• Retains rear-seat audio control capabilities
• Supports dual-zone audio/controls where factory equipped
• Maintains OEM user experience after aftermarket upgrade

Who is this for: The PAC RP5-GM31 is aimed at professional installers and DIY enthusiasts replacing the factory radio in compatible GM LAN vehicles who want to keep factory features working. It’s especially useful when maintaining OnStar service, preserving steering wheel controls, retaining factory Bluetooth (for many 2009+ models), and integrating navigation or backup camera outputs are priorities. If you need a compact, network-aware interface to ensure a clean, reversible upgrade without sacrificing OEM functionality, this module offers a practical solution.

Technical note: The module ships in a durable blue housing sized 8.60" x 8.50" x 2.10" and connects to the vehicle’s LAN/radio harness. Verify vehicle compatibility with PAC’s application guide before purchase to ensure support for your specific GM model and year.