Axxess LOC-GMH4 Active LOC T-Harness for Chevrolet and GMC 2019-Up RPO IOR

Axxess LOC-GMH4 is a vehicle-specific Active LOC T-harness for adding a subwoofer amplifier or full aftermarket amplifier system to compatible non-amplified factory radios. The harness provides convenient access to speaker-level audio signal while keeping the factory radio connected and helping reduce cutting or splicing during installation.

At a Glance

• 8-pin LOC T-harness for non-amplified factory systems
• Designed for adding a standalone subwoofer amplifier or complete aftermarket audio system
• Provides 12V power lead with in-line 10A fuse, ground, and remote turn-on wire with butt connector
• 4-channel speaker-level outputs
• Input and output quick-connect harness for easier installation
• Works with Axxess Active line output converters
• Step-by-step instruction manual included

Exact Vehicle Compatibility

Find your vehicle below, then match the model year and factory-equipment details in the same row. Factory radio, amplifier, navigation, trim, speaker location, and connector differences can change which installation parts are required. If anything differs, contact MCOR before ordering.

Fitment note: Year and model alone are not always enough to confirm compatibility. Match every factory-equipment qualifier shown for your vehicle, and contact MCOR Automotive if the radio, amplifier, navigation, speaker, camera, trim, or connector details are uncertain.

Installation Notes

• Designed to connect at the factory radio harness location
• Provides speaker-level output signal for compatible LOCs, signal processors, powered subwoofers, or amplifiers with high-level inputs
• Can support standalone subwoofer amplifier additions or complete 4-channel amplifier integrations when the system design matches the harness application
• Professional installation is recommended for signal routing, amplifier wiring, gain setup, and system tuning
• Check the latest Metra / Axxess instructions before installation

What’s in the Box

• Axxess LOC-GMH4 Active LOC T-harness
• Instruction manual

Technical Specifications

• Brand: Axxess
• Model: LOC-GMH4
• Product Type: Vehicle-specific Active LOC T-harness
• Application: select Chevrolet and GMC 2019-up non-amplified vehicles with RPO IOR
• Audio System: Non-amplified factory systems
• Speaker Outputs: 4-channel speaker-level outputs
• Power Lead: 12V with in-line 10A fuse
• Turn-On Lead: Remote turn-on wire with butt connector
• Sold As: Each

Identifiers & Packaging

• MPN: LOC-GMH4
• UPC: 086429429721
• Sold As: Each
• Included Components: Axxess LOC-GMH4 Active LOC T-harness, Instruction manual

Why Buy From MCOR Automotive

• Authorized retailer for the brands we sell
• Specialists in vehicle audio integration, radio replacement parts, and installation accessories
• 22+ years of professional automotive electronics experience
• Expert support for compatibility verification and proper setup