Video

3UZ NEW HARNESS PACKAGE EXAMPLE

AVAILABLE for 2UZ and 3UZ applications.

To help you order with confidence, we’ve created a set of short unboxing videos—each one shows exactly what you will receive when you purchase a 3UZ Lexus V8 Custom Standalone Harness.

In these clips you’ll see:

Complete Standalone Engine Harness – brand-new, professionally loomed and clearly labeled.
Optional Pre-Flashed ECU – shown in some videos; this is an optional extra billed separately.
All the small details—connectors, labeling and finish—so you can inspect the quality before you buy.

These videos are a quick way to understand what arrives in the box, whether you’re ordering the harness alone or the complete system with ECU.
👉 Browse the videos above to see the exact components you’ll receive, for either 5-speed or 6-speed manual applications, left- or right-hand drive, with the ECU designed to be cab mounted (glove box area).

3UZ Harness Installation

To help you complete your build with confidence, we’ve created a detailed engine-installation video—showing exactly how to fit the 3UZ Lexus V8 Custom Standalone Harness onto the engine itself.

In this video you’ll see:

Plug-and-Play Engine Connection – how to route and secure the harness cleanly around the 3UZ VVT-i engine and connect every sensor, injector and coil.
Cab-Mounted ECU Placement – recommended location in the glove box (or similar protected cabin area) for easy access and long-term protection.
Professional Securing Tips – how to clip, tie and protect the loom for a factory-quality finish.

Note: This guide covers the engine-side installation only. Final connections to the vehicle—ignition feed, fuel-pump trigger, starter signal and instrument-cluster outputs—are completed by the installer using the supplied pigtail.

👉 Watch the video above to see how simple it is to install the harness on either 5-speed or 6-speed manual applications, for left- or right-hand-drive vehicles, and prepare your 3UZ engine for a clean, reliable start-up.

3UZ Harness Test Run & Diagnostics

To give you complete peace of mind, we finish every build with a full test run and diagnostic scan of the 3UZ Lexus V8 Custom Standalone Harness before it leaves our workshop.

During this final check you’ll see:

Clean First Start – the harness powers the 3UZ VVT-i engine from cold, proving true plug-and-play engine operation.
Complete OBD-II Diagnostic Scan – live verification of all sensor readings and confirmation that no fault codes are present.
System Verification – every key circuit—fuel, ignition and ECU communication—is tested to ensure the harness performs exactly as designed.

Note: This demonstration focuses on the harness itself. Final vehicle-side connections (ignition feed, fuel-pump trigger, starter signal and instrument-cluster outputs) remain the installer’s responsibility and are completed via the supplied pigtail.

👉 Watch the video above to see the 3UZ harness deliver a flawless first start and pass a comprehensive diagnostic scan, whether for 5-speed or 6-speed manual applications, in left- or right-hand-drive vehicles.

New Custom Harnesses

🧰 2UZ & 3UZ New Engine Harness Kits

Starting at $1,500 — Typical cost: $1,500–$1,600 depending on options and sensor support.

We now offer brand-new wiring kits for the 2UZ-FE and 3UZ-FE platforms. These are built from scratch using high-quality automotive-grade materials, designed for clean integration and long-term reliability. Ideal for customers who don’t have a donor harness or want a fresh start.

✅ What’s Included in Every Kit

✔️ Brand-New Harness Build
No reused components. Every wire, connector, and split tube is new and professionally assembled.

✔️ Integrated Fuse Box
Simplifies installation and ensures proper circuit protection.

✔️ ECU Connector & Client Plug
Includes a client plug with labeled pigtails for easy vehicle-side integration:

Ignition
Start signal
Fuel pump power
Tach signal
Temp sensor
Charge light
Oil pressure light
Air conditioning clutch trigger

✔️ OBD2 Diagnostics Support
Harnesses are built to support OBD2 scanning and live data.

✔️ Optional Add-Ons
Available at extra cost:

Cruise control wiring

📦 What You’ll Receive

✅ Fully built, engine harness
✅ ECU connector and client plug
✅ Hardware Installation Kit
✅ Air Flow Meter Housing
✅ OBD2 Extension Cable with accelerator connector (where applicable)
✅ Shared folder with documentation:
- Pinouts
- Installation notes
- Invoice & shipping details
- Test Run Video and diagnostics scan of your harness