Day time running lights not recognized on audi tt 08?

Old 05-13-2008, 07:20 PM
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Default Day time running lights not recognized on audi tt 08?

i recently switched the stock DRL bulb for an LED Bulb as my DRL now, i switched it, and both bulbs turned on. But for some reason, in my dashboard, it does not recognize that my bulb is there, it has a builb then an 'X' on it.
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Old 05-13-2008, 10:27 PM
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Default Re: Day time running lights not recognized on audi tt 08?

I've read a few threads in different forums about this happening with LED bulbs on the new model Audi's, especially TT's. Most of the topics have been for interior and license plate lights, but with the LED's they either don't work at all or don't register.

I'd contact the manufacturer or distributor if you can. If they have a solution, let us know how it works out as I wouldn't mind doing something different with my dull DRL's too.

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Old 05-13-2008, 10:29 PM
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Default Re: Day time running lights not recognized on audi tt 08?

o relly? im glad im not the oni one, well i guess ill just drive for now with an annoying beep everytime i turn on the lights
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Old 05-13-2008, 10:33 PM
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Default Re: Day time running lights not recognized on audi tt 08?

Does it continuously beep? Or is it just when you turn on the lights?

I'm thinking about getting the European headlight switch. On the US and European cars there is an additional switch to turn off the DRL's completely. I'll just run my fogs in the day. I installed PIAA Plasma Yellow bulbs and really like the way the look now.

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Old 05-13-2008, 10:40 PM
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Default Re: Day time running lights not recognized on audi tt 08?

o relly? idk i can turn off my DRL, and i bought the car in Canada =S
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Old 05-13-2008, 10:57 PM
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Default Re: Day time running lights not recognized on audi tt 08?

LED's are about 4 watts and the other bulb is 12 or more 3 times the intensity in power. What you need to do is get a resistor and put it in line with the LED light to "draw" more power so the lightbulb sensor recognizes the proper 12W (or whattever the wattage rating is) vs the 4W this is why you get a burnt out bulb signal
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Old 05-13-2008, 11:33 PM
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Default Re: Day time running lights not recognized on audi tt 08?

Originally Posted by 1move View Post
LED's are about 4 watts and the other bulb is 12 or more 3 times the intensity in power. What you need to do is get a resistor and put it in line with the LED light to "draw" more power so the lightbulb sensor recognizes the proper 12W (or whattever the wattage rating is) vs the 4W this is why you get a burnt out bulb signal
The 42DD bulbs have the resistors (designed to work up to 14.5v) and they don't work either. I guess they are working on a fix.

42 Draft Designs
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Old 05-14-2008, 07:13 AM
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Default Re: Day time running lights not recognized on audi tt 08?

THe led bulbs im using are 12V, but before when i was using a Brighter Halogen lamp (Not Stock) it was 12V too seems to recognize the Halogen Lamp but not the led
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Old 05-14-2008, 08:37 AM
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Default Re: Day time running lights not recognized on audi tt 08?

Originally Posted by Regina_TT View Post
The 42DD bulbs have the resistors (designed to work up to 14.5v) and they don't work either. I guess they are working on a fix.

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Originally Posted by limeoasis View Post
THe led bulbs im using are 12V, but before when i was using a Brighter Halogen lamp (Not Stock) it was 12V too seems to recognize the Halogen Lamp but not the led
V and W is way different you guys, Yes the LED's are rated for the appropriate voltage and yes the other bulb is rated for the same voltage, however W (watts) indicates the resistance or power draw from the system if the audi system recognizes a short and has been programed to read a variable wattage range from 11-13 watts and anything below that spectrum is a fault. So what you need to do for an LED is put in a resistor so it draws more power from the system and as soon as an LED burns out being at 4.5W you still have your inline resistor which will in most cases give out as well, and if it doesent it takes you from your potential 12W down to 7.5W of resistance which causes a fault an d aresitor overload and burns out So basically you need to add a resistor or short the sensor and you wont get the warning
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Old 05-14-2008, 10:19 AM
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Default Re: Day time running lights not recognized on audi tt 08?

Originally Posted by 1move View Post
V and W is way different you guys, Yes the LED's are rated for the appropriate voltage and yes the other bulb is rated for the same voltage, however W (watts) indicates the resistance or power draw from the system if the audi system recognizes a short and has been programed to read a variable wattage range from 11-13 watts and anything below that spectrum is a fault. So what you need to do for an LED is put in a resistor so it draws more power from the system and as soon as an LED burns out being at 4.5W you still have your inline resistor which will in most cases give out as well, and if it doesent it takes you from your potential 12W down to 7.5W of resistance which causes a fault an d aresitor overload and burns out So basically you need to add a resistor or short the sensor and you wont get the warning
From how it was explained to me from 42DD, it was a voltage problem. It sounds to me now that they may not even be looking in the right place then!

ON a side note, I always wondered why we were the only country with daytime running lights. I didn't realize the rest of the world shipped it due to fuel consumption:

"Daytime running lights: more safety

The unquestionable safety gain of permanent daytime running lights has until now had its price: an increase in fuel consumption of around 0.2 litres per 100 kilometres. This fact stood in the way of the blanket introduction of this technology throughout Europe. Audi has solved this problem: a dimmed bulb serves as the light source, and the rise in fuel consumption is negligible. With the dipped and main beams in the xenon plus headlights being integrated into the same outer unit, the inner reflector remains free for the use of daytime running lights."

About halfway down the page...
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