PAC - AP4-GM61 - ***Serialized*** AmpPRO for Select GM vehicles with 20-pin and 8-pin connectors (MOST50) Audio output interface for vehicles

PAC – AP4-GM61 (Serialized)

AmpPRO Audio Integration Interface
For Select GM Vehicles Using MOST50 Digital Audio (20-Pin + 8-Pin Radio/Amplifier Connectors)

DESCRIPTION

• OEM audio integration module that provides a clean low-level pre-amp signal from GM factory radios that use MOST50 digital audio networks.

• Allows the installation of aftermarket amplifiers or DSP processors while retaining full factory infotainment, alerts, chimes, Bluetooth®, and navigation audio.

• Serialized hardware version ensures correct firmware pairing with vehicle-specific MOST50 configurations.

FEATURES

• Converts MOST50 digital audio to Front + Rear low-level RCA outputs.

• No LOC or speaker summing required — direct digital signal tap.

• Maintains:

  • OEM volume, fade, balance, and tone control

  • Steering wheel audio controls

  • Bluetooth® calling & streaming

  • Navigation prompts & safety chimes

• Provides +12V remote amplifier turn-on output.

• Fully reversible — preserves factory wiring.

FUNCTIONAL APPLICATIONS

• Add a subwoofer amplifier to factory audio.

• Feed a DSP for system tuning, staging, and equalization.

• Fully re-amplify all speakers while keeping the OEM radio.

• Ideal for OEM+ upgrade, stealth install, or dealer-compatible audio enhancement.

SPECIFICATIONS

• Network Input: MOST50 Digital Audio Bus

• Audio Output: Front L/R + Rear L/R RCA low-level pre-outs

• Output Voltage: Up to ~5V (system dependent)

• Trigger Output: +12V amp remote turn-on

• System Type Support:

  • Factory amplified systems

  • Factory non-amplified systems when MOST50 head unit is present

• Maintains OEM DSP routing when applicable (system dependent)

INSTALLATION NOTES

• Installs at the factory radio module or external OEM amplifier, depending on vehicle trim.

• MOST50 systems are data-synchronized — all wiring must remain clean and properly seated.

• If vehicle has Active Noise Cancellation (ANC), ANC may require deactivation to avoid bass feedback.

• Can be paired with PAC APH-GM## T-Harnesses for plug-and-play amplifier routing (optional).

FITMENT

• For select GM vehicles equipped with MOST50 digital audio architecture, typically 2014+ depending on model.

• Examples (fitment varies by trim & audio package):

  • Chevrolet: Silverado, Tahoe, Suburban, Traverse, Malibu, Camaro

  • GMC: Sierra, Yukon, Acadia, Terrain

  • Cadillac: Escalade, XT5, CTS (MOST50 variants)

  • Buick: Enclave, Regal

• Connector Verification Required: Must match 20-pin + 8-pin radio/amp plug layout.

INCLUDES

• AP4-GM61 (Serialized) Interface Module

• Vehicle-specific MOST50 harness

• Remote turn-on output lead

• Configuration & setup instructions