Axxess LOC-GMH2 GM T-Harness for Factory Audio Upgrades
Upgrade your factory audio system with the Axxess LOC-GMH2, a vehicle-specific active LOC T-harness designed to make adding an aftermarket amplifier, powered subwoofer, or complete aftermarket audio system easier than ever. Built for select 2014-2020 Chevrolet, GMC, Buick, and Cadillac vehicles with non-amplified factory audio systems, the LOC-GMH2 provides a plug-and-play installation solution that allows you to integrate aftermarket audio equipment while maintaining your factory radio.
The LOC-GMH2 connects directly behind the factory radio to provide access to factory speaker-level audio signals without the need to cut or splice OEM wiring. This clean, reversible installation method helps preserve your vehicle's original wiring while reducing installation time and complexity. Whether you are adding a dedicated subwoofer amplifier for improved bass performance or installing a full-range amplifier system, the LOC-GMH2 provides the connections needed for a reliable factory audio upgrade.
Featuring four channels of speaker-level outputs, the LOC-GMH2 gives installers the flexibility to configure a variety of aftermarket audio setups. The harness can be used to add a standalone subwoofer while keeping factory speakers powered, or it can be configured for a complete amplified audio system upgrade. It is also compatible with Axxess line output converters, most sound processors, and amplifiers with high-level inputs, making it a versatile solution for many installation applications.
Designed with OEM-style connectors and input/output quick-connect harnesses, the LOC-GMH2 provides a secure factory-style connection while simplifying the installation process. The harness includes access to constant 12V power with an in-line 10-amp fuse, ground, and remote turn-on leads, allowing installers to efficiently connect aftermarket amplifiers and signal processors.
One of the biggest advantages of the LOC-GMH2 is its ability to maintain factory wiring integrity. Because no permanent modifications are required, the vehicle can be serviced, returned to stock, or upgraded again in the future with minimal effort. This makes it an ideal choice for anyone looking for a professional-quality audio upgrade without compromising factory reliability.
Before purchasing, vehicle compatibility should always be verified. The LOC-GMH2 is designed for select Chevrolet, GMC, Buick, and Cadillac vehicles with RPO codes IO3, IO5, I06, IOA, or IOB and non-amplified factory audio systems. Confirming fitment ensures proper installation and optimal performance.
Whether you're adding deeper bass with a powered subwoofer, installing a multi-channel amplifier, or creating a complete aftermarket sound system, the Axxess LOC-GMH2 delivers the vehicle-specific integration, plug-and-play convenience, and factory-quality connection needed for a clean and reliable audio upgrade.
Key Features
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Vehicle-specific active LOC T-harness for select 2014-2020 Chevrolet, GMC, Buick, and Cadillac vehicles
- Designed for non-amplified factory audio systems
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Plug-and-play installation with no factory wire cutting or splicing
- Four-channel speaker-level audio outputs
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Supports adding a standalone subwoofer or complete aftermarket audio system
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Compatible with Axxess line output converters, sound processors, and amplifiers with high-level inputs
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OEM-style connectors for a secure factory-quality fit
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Input and output quick-connect harnesses for easier installation
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Includes 12V power with 10A inline fuse, ground, and remote turn-on connections
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Preserves factory wiring for a clean, reversible installation
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Includes step-by-step installation instructions
