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Exterior guides and mods

453 Facelift LED Headlight Retrofit

Modification Details

This is now a full road-legal guide.


It is a work-around and not exactly the same as how the cars from the factory function.

Read the bottom of the page for the reward for solving the coding issue.

I will still be researching to determine how the factory spec cars dim the DRLs to create a side light.

What Are We Fitting?

These are the facelift full LED headlights. There are no bulbs in these at all.
These headlights were an option from November 2019 onwards (depending on region).

How Much Are They?

People on FaceBook never seem to believe me when I say how much they cost.

They seem to think that 3rd party sellers will sell OEM smart parts for less than a smart dealer.

If your local smart dealer is charging too much, contact a different smart dealer in a different country.

The 1st lot I bought was in December 2019 and they were the same price as when I bought them in March 2020.

Are They Plug And Play?

Unfortunately not. The units are very clever but that makes them complicated.

What Works & What Doesn't?

If you fit them, plug them in and turn the lights on, you will get the low beam coming on.

However, you get no side light, no DRLs and if you try to put the high beam lights on, they flash on for a split
second and then go out. The low beam lights also go out all the time the high beam lights are selected.

When you turn all the lights off and turn off the ignition once again, the indicator lights up continuously for a few minutes.

Why Do The Low Beam Lights Turn Off When The High Beam Is Selected?

Just a quick bit of information that you may not know. The other 453 headlight styles used an H4 bulb. These have 2 filaments.
1 filament for high beam and 1 filament for low beam. Both filaments couldn't be active at the same time as they got too hot.
So, when 1 of the filaments was on, the other would be off.

What Are The Issues That Need Fixing To Make These Lights Legal?

1# The high beam light must come on and stay on.
2# The indicators must flash.
3 #The DRLs must turn off when the indicators are flashing and turn back on afterwards.
4# The DRLs must come on when the car is started.
5# The DRLs must dim to be side lights or separate side lights must light when the headlights are turned on.

Out Of These 5 Issues, What Have You Fixed?

After 4 weeks of research, I have now fixed all of the issues.

1# High Beam Issue

I've made the high beams come on at the same time as the low beams.

2# Indicator Problem

I've made the indicators flash.

3# DRLs Off When Indicating Problem

I've made the DRLs/side lights turn off when the indicators are functioning (proof of concept on the original lights).

4# DRLs Functioning Problem

The DRLs now come on when the car is started.

5# DRLs Going Off And SideLight Coming On Problem

This was the final hurdle and it's one I eventually worked around to make them fully road-legal.


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