Nexus S3 Plug ‘n’ Play Adapter Harness Subaru WRX / STI MY11-19 (ADM)

Seamless Nexus Integration for ADM Subarus

The Nexus S3 Plug ‘n’ Play Adapter Harness is the dedicated link between the Haltech Nexus S3 VCU and the Australian Domestic Market (ADM) Subaru WRX / STI (MY11-19). This is the adaptor harness only, designed for existing Nexus S3 owners who need to install their unit into a VA or GR/GV chassis Subaru. It provides a clean, reversible connection to the factory wiring loom without the need for cutting or splicing.

Precision Wiring

Engineered to handle the specific pinout of ADM Subarus, this harness correctly routes power, ground, and signal wires for the EJ25 and FA20 engines. It supports all critical functions including the Drive-By-Wire throttle, Quad AVCS (where equipped), and factory instrument cluster communication via CAN bus. Using this harness ensures that the Nexus S3 receives clean, noise-free signals from the crank and cam sensors, which is vital for high-RPM stability.

Fitment Guide

Vehicles: Subaru WRX / STI (MY11-19)
Region: Australian Delivered Models (ADM) Only
Requires: Haltech Nexus S3 VCU (Sold Separately)

Technical Specifications

Summary & What’s Included

The correct harness for Australian WRX/STI builds.

Includes:

• Plug ‘n’ Play Adaptor Harness
• Air Temp Sensor
• Auxiliary I/O Plugs
• Note: ECU/VCU NOT Included