Axxess LOC-GMH3 Active LOC T-Harness for Chevrolet and GMC 2019-2023 RPO IOS/IOT/IOU

Axxess LOC-GMH3 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.

Key Features

• 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 line output converters
• Step-by-step instruction manual included

Vehicle Fitment / Application

select Chevrolet and GMC 2019-2023 non-amplified vehicles with RPO IOS, IOT or IOU

Applications listed by Axxess include Chevrolet Blazer, Camaro, Colorado, Cruze, Equinox, Malibu, Silverado, Silverado HD, Sonic, Spark, Suburban, Tahoe and Traverse; and GMC Acadia, Canyon, Sierra, Sierra HD, Terrain, Yukon and Yukon XL where listed.

Important: LOC T-harness fitment is application-dependent. Always verify the latest Metra / Axxess fit guide by year, make, model, trim, factory radio, non-amplified audio status, and connector style before purchase or installation.

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-GMH3 Active LOC T-harness
• Instruction manual

Technical Specifications

• Brand: Axxess
• Model: LOC-GMH3
• Product Type: Vehicle-specific Active LOC T-harness
• Application: select Chevrolet and GMC 2019-2023 non-amplified vehicles with RPO IOS, IOT or IOU
• 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-GMH3
• UPC: 086429432745
• Sold As: Each
• Included Components: Axxess LOC-GMH3 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