Hi all,

I’m currently researching a potential OEM retrofit for my 2016 Lexus GX460 (pre-facelift), and I’m looking into installing the 2020+ OEM LED (triple beam) headlights.

I’m specifically aiming to keep the setup as close to factory/OEM as possible, rather than going aftermarket. Before moving forward, I’d really appreciate input from anyone who has completed this retrofit or has access to detailed technical information.

Here are the main areas I’m trying to understand:

1. Physical Fitment / Mounting Points
- Do the 2020+ headlight housings share any common mounting points with the 2014–2019 models?
- Are the upper brackets compatible, and if so, how different are the side/lower mounting tabs?
- Has anyone successfully installed them using minor modification (slotting tabs, custom brackets), or is it fundamentally incompatible without changing the front end?

2. Bumper & Grille Compatibility
- Is it realistically possible to retain the 2016 bumper and grille with acceptable alignment and gaps?
- Or is a full front-end conversion (2020 bumper + grille + brackets) essentially required for proper fitment?

3. Wiring / Connector Differences
- How different are the headlight connectors between 2016 and 2020+?
- Has anyone mapped the pinouts between both generations?
- Are there any known plug-and-play harness adapters, or is custom wiring the only route?

4. Electronics / Control Modules
- Do the 2020+ headlights rely on a dedicated headlight ECU or LED driver modules not present in the 2016?
- Any known issues with CANBUS communication, DRL behavior, or “Headlight System” warnings?
- Is additional hardware (modules, relays, resistors, or even ECU changes) required to make everything function correctly?

5. Practical Considerations
- For those who’ve done it: was it worth the effort using OEM components?
- Or does it turn into a project where a full 2020+ front-end swap is the more logical route?

My goal is a clean, reliable OEM+ result without electrical issues or poor panel fitment.

If anyone has completed this swap, I’d really appreciate:
- Photos of mounting points or installed fitment
- Wiring diagrams or pinout references
- Part numbers for required modules or harnesses

Thanks in advance for any insight.

 

Don’t believe there is anyone done that. Couple of basics points. It requires not only headlights replacement, wire harness replacement, but also completely different Lights control ECU and main body ECU. So, beyond the costs, you will have lots of CANBUS communication issues between main body ECU and other ECUs (not even sure if will communicate at all).

 

I really wanna do this swap along with the updated grill, but it looks like after market is the only way to go. I have no idea what to buy either. Roll the dice with ebay?

 

Does this mean the issue is more complex than a simple matter of disassembling and assembling? Could the average person dismiss the idea?