I can’t code USDM lights on my MK3. Can anyone help me?

Jun 19, 2025
2
0
Hello guys, I’ve bought my first car a Seat Leon MK3 1.4 FR. After some time I wanted to do a few mods with the lights with light coding. I bought an OBD11, but Everytime that I try to enable USDM it says error. I’ve seen somewhere that I need to change the BCM. Has anyone done this in the past or if you guys know what I should do?
 

SRGTD

Active Member
May 26, 2014
2,751
1,610
Hi @Bobbybuilder - I see from you’re from the UK from your country flag below your avatar and forum name. USDM (United States Domestic Market) setting that uses orange indicators as daytime running lights isn’t legal in the UK and that might be why you get an error when you try to enable USDM.

With USDM light setting, you might also get stopped by the police and you could get a fine, or at best an informal warning.
 

andycalvia

Full Member
Oct 20, 2004
349
58
40
Ayrshire
Hello guys, I’ve bought my first car a Seat Leon MK3 1.4 FR. After some time I wanted to do a few mods with the lights with light coding. I bought an OBD11, but Everytime that I try to enable USDM it says error. I’ve seen somewhere that I need to change the BCM. Has anyone done this in the past or if you guys know what I should do?
USDM setting won't be allowed as it would set the car up 'illegally' for use in the UK.

Orange DRL's and the change to the rear indicator which makes the tailgate and rear wing signals flash separately both look stupid anyway IMO
 

SRGTD

Active Member
May 26, 2014
2,751
1,610
USDM setting won't be allowed as it would set the car up 'illegally' for use in the UK.

Orange DRL's and the change to the rear indicator which makes the tailgate and rear wing signals flash separately both look stupid anyway IMO

There are probably insurance implications too. Most - if not all - car insurance policies will include a clause that states the car must be maintained in a roadworthy condition. If changes have been made to the car that makes it illegal to use on UK roads, then technically it is likely to be considered unroadworthy and the insurance company could void the insurance cover. Additionally, driving an unroadworthy car on UK roads is a criminal offence.
 
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