Modern Canbus systems do strange things when they see a different current in a circuit than expected. Providing the lights are working without any flashing, just look for a local VCDS user on the map and get them to disable the warning light (you actually tick the box to turn it on strangely enough).
As no-one else has replied to this.....from the information on the THQ website, my understanding was that they recommended not using 100W bulbs with their harness as it would overload the vehicle wiring. I'm presuming it takes the same vehicle feed and sends it to both bulbs without using a relay. As you have enabled both bulbs in VCDS, you have two separate feeds to the bulbs so would be in a better place to run both 100W bulbs however I did do some voltage drop tests which would suggest you are better off sticking with stock rated bulbs (I think I put the results earlier in this thread somewhere).
Thanks for your help im having the steering wheel changed soon so will get the guy to sort the coding thingy and take the light off, I will be speaking robelkiot again so will be interested to see what he says! With regard to MOT the bulbs might fail but the dipped beam going off when the high beam going on isn’t an issue as the dipped stays on when high beam is on.
Did you get the vehicle coded to keep both lights on or is that an additional harness (it does look like another harness)? If not, you could get it coded properly and probably lose a lot of that wiring. At MoT time you're at the mercy of the tester. Although strictly speaking a fail, the tester may not realise it has LEDs fitted or even mistake it for having OEM LEDs fitted but there are obvious differences and irrespective of what Sam Lawson states above, they are usually very switched on people as they are trusted by the Government to identify unsafe vehicles. If I've ever had any concerns about anything at MoT time, I've spoken to the tester when I've booked it in a week before and asked for their advice.
No not had coded there plug and play what ever that means, I will have a word with the guy who is doing my steering wheel and get him to read some of your posts to see if he can do what your saying there is a lot or wiring behind each head light, as long as there safe to use as in won’t affect the vans electrics then I can live with the bulb warning light for a week or two until I get it in for the wheels change.
The plug and play is an additional harness so you can lose that with VCDS coding. Also, next time you do get the light warning, double check the bulbs including indicators, number plate and brakes are actually all working. It could be a genuine fault somewhere else on the vehicle!
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