PAC Radio Replacement Interface for 2006–2025 GM Vehicles — OnStar Retention, Steering Wheel Control & Reverse Camera Output

PAC's radio replacement interface lets you swap the factory radio in many 2006–2025 GM vehicles while keeping OnStar, steering wheel controls, factory Bluetooth, and rear-seat audio functions intact.

Replacing a GM factory head unit can unlock modern features without sacrificing the vehicle’s original systems. This compact interface bridges aftermarket radios to GM wiring and data buses so essential factory functions—OnStar, steering wheel control, illumination, parking brake detection, and rear-seat audio—continue working as expected. It also provides navigation outputs and reverse wire support to simplify camera and infotainment integration.

How does the PAC interface preserve OnStar and safety systems?

The module maintains the vehicle’s OnStar connection by interfacing with the factory data lines that the original radio used. Because it communicates with the vehicle’s control networks, OnStar functions remain available after the head unit swap, avoiding the need to modify or remove factory harnesses. Installation keeps factory safety communications intact while providing outputs needed by modern radios.

• Built-in OnStar retention preserves emergency and concierge services
• Connects to factory data bus instead of cutting harness wires
• Maintains compatibility across supported 2006–2025 GM models

Will steering wheel audio controls and factory Bluetooth still work?

Yes—this PAC interface retains steering wheel control (SWC) functionality and preserves factory Bluetooth on compatible vehicles (2009 and newer). The interface translates the vehicle’s control signals into commands your new radio understands, so you keep hands-free convenience and audio control without extra adapters in many cases.

• Steering wheel control retention for audio and phone buttons
• Maintains factory Bluetooth on 2009+ GM vehicles for hands-free calling
• Reduces need for additional SWC modules or manual button remapping

What connections and outputs does the interface provide for aftermarket radios?

The PAC unit supplies navigation outputs, reverse wire output for backup cameras, illumination output for dimming, and a parking brake output required by some video functions. It also supports rear-seat audio controls and dual-zone audio configurations that many OEM setups use, ensuring your aftermarket radio integrates cleanly with the vehicle’s existing features.

• Navigation outputs for external navigation modules or screens
• Reverse wire output to trigger backup cameras when in reverse
• Illumination and parking brake outputs for display dimming and video enable
• Retains rear-seat audio controls and dual-zone functionality when present

How straightforward is installation and which vehicles are compatible?

Installation is designed for technicians and experienced DIYers familiar with GM dash disassembly and head unit wiring. The interface plugs into factory connectors where possible and uses clearly labeled wires for any additional connections. Compatibility covers select GM vehicles from 2006 through 2025—check your vehicle’s model and year against PAC’s fit guide to confirm support before ordering.

• Installs behind the dash, integrating with factory harnesses
• Wiring labeled for OnStar, SWC, reverse, illumination, and parking brake outputs
• Consult PAC compatibility list for exact vehicle models and years supported

Who is this product for? If you’re upgrading a compatible GM vehicle’s factory radio to a modern aftermarket unit but want to retain factory conveniences like OnStar, steering wheel controls, factory Bluetooth (on 2009+ models), rear-seat audio, and dual-zone audio features, this PAC radio replacement interface provides the necessary connections and outputs. It’s aimed at installers, car audio shops, and capable DIYers who need a clean, reversible integration that preserves the vehicle’s original systems while adding contemporary infotainment capabilities.