Home > LED > B7 Audi A4, S4 and RS4 LED Daytime Running Lights (DRL)

B7 Audi A4, S4 and RS4 LED Daytime Running Lights (DRL)

LED DRL for B7 Audi A4 & S4

I just finished installing LEDs on my B7 Audi S4 and wanted to share some pics and a quick DIY if you want to do it yourself. Above I’ve pictured the before & after, as you’ll see you get rid of that yellow-ish halogen with a super bright & clean cool white color from the LED. It takes about 10-20 minutes to install and luckily you don’t have to remove the bumper or headlights to install, you just have to wiggle your hands a bunch.

Here’s what you’ll need for the conversion:

LEDs for DRL in Audi

2 BA15s Bayonet Bulbs (one for each side):



2 10-15 watt, 25 ohm resistors (one for each side):



The install is pretty simple as I said before. I followed this DIY on Tyresmoke.net but took some additional pictures to help out.

First, remove the plastic cap on the side of the housing, then pull out the stock bulb by turning it counter-clockwise. Be careful not to pull the wiring too hard or you’ll pull out the city lights too (the smaller bulb also pictured) which are very hard to remove. It’s a little tricky to get the bulb out but just be patient and if you have to, find a friend with small hands to help out :) For the passenger side you’ll need to remove the plastic air intake to access the side of the headlight, which is held in just by two phillips head screws. Here’s a pic of the bulbs taken out:

DRL and City Lights

Next take out the stock bulb and plug in the LED bulb to the grey plastic base.

LED DRL bulb

Next you’ll want to install the resistors. You’ll simply bridge the yellow and brown wires with the resistor connecting the two. It helps to strip a section of both wires so the resistor gets good contact (in theory those resistor clamps should strip for you, but I’ve found they often don’t get a good enough connection). Test to make sure the bulb works and resistor is working too (it will get very hot very quickly) before trying to put the bulb back in, as it’s a pain to wiggle it back into place.

Resistor for LED DRLs

Because the resistor gets very hot, I didn’t want it inside the headlight housing where it could melt other wires or even the headlight housing itself. So I kept the resistor outside of the housing and just kind of pinched the wiring in the cap. I then found a way for each side to tape our mount the resistor where it wouldn’t cause much trouble and stay cooler.

LED DRLs in B7 Headlights

Just repeat for the other side and you’re all set!

LED DRLs in B7 Headlights

Categories: LED
  1. Gustavo Delgadillo
    May 29, 2012 at 9:26 pm

    I see that the guy that did this before you, from Tyresmoke.net, had some issues with the resistors not being the right ones? Did you have any issues? did you get any errors?

  2. Vlad
    July 5, 2012 at 9:18 pm

    What about error code
    I got light bulb warning on my mk2 tt

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