Audi Headlights Comprehension Guide

**fly300kts** · 01-22-2011 12:16 PM

It seems that there is some confusion between the different headlights installed on the A4 B7 so here is a little guide that should answer most of the questions:

OEM Bi-Xenon

YELLOW ARROW: Bi-Xenon - Bulb Type = D1S
GREEN ARROW: Turn Signal - Bulb Type = 1156 (12V 21W)
BLACK ARROW: DRL (Day Time Runing Light): Bulb Type = 1156 (12V 21W)
RED ARROW: City Light - Bulb type = 158,168,194 (12V 5W)

WHY BI-XENON?

The headlight use the same bulb for Low & High beam. Here is how it works:

This is a picture of the beam housing removed from the headlight. You can see the D1S bulb installed. Also note the grey metal plate in the front.

Same housing, side view: you can see that the grey flap is in contact with the housing: This is the LOW BEAM POSITION

When you select High Beam, via an electro magnet, the grey flap tilts forward: This is the HIGH BEAM POSITION

HALOGEN

YELLOW ARROW: Low Beam - Bulb Type = H7 (12V 55W)
BLUE ARROW: High Beam - Bulb Type = H7 (12V 55W)
RED ARROW: City Light - Bulb type = 158,168,194 (12V 5W)
GREEN ARROW: Turn Signal - Bulb Type = 1156 (12V 21W)

I think I covered everything and now it makes sense for everyone
Let me know if any question

Phil

**JMG** · 01-22-2011 12:36 PM

Thanks for the awesome post fly! You should add this to the wiki...

**fly300kts** · 01-22-2011 12:45 PM

Originally Posted by JMG

Thanks for the awesome post fly! You should add this to the wiki...

Your Welcome
Since you are a moderator, can you do it?

Phil

**Mc Suly** · 01-22-2011 12:46 PM

PERFECT!!

BLACK ARROW: DRL (Day Time Runing Light): Bulb Type = 1156 (12V 21W)

Now i know what type of bulb specifications to get when getting a white color without throwing an error!!!

**Kipper984x** · 01-22-2011 12:49 PM

awesome post, very helpful

**fly300kts** · 01-22-2011 12:50 PM

Originally Posted by Mc Suly

PERFECT!!

BLACK ARROW: DRL (Day Time Runing Light): Bulb Type = 1156 (12V 21W)

Now i know what type of bulb specifications to get when getting a white color without throwing an error!!!

Well, here is the catch in your case:
I assume that you will be looking for LED but you will not find an LED replacement with a 21W draw. They will need to have a resistor built in and I have not seen, yet, these in 1156 socket type

Phil

**Mc Suly** · 01-22-2011 12:54 PM

Forget the LED then I'll just stick with the regular bulb and find a white one :)

**fly300kts** · 01-22-2011 12:58 PM

Originally Posted by Mc Suly

Forget the LED then I'll just stick with the regular bulb and find a white one :)

10-4

Phil

**Zac** · 01-22-2011 01:03 PM

Nice little write up Phil!

**PPLAPW** · 01-22-2011 05:16 PM

Awesome post Phil, I appreciate the effort you put into this.

Hopefully this will decrease all those headlight inquiries you get...

**ryanworth** · 01-22-2011 05:41 PM

Excellent work again sir!

**beantown** · 01-22-2011 05:54 PM

Thanks Phil; excellent reference guide. (Especially to keep all the noobs at bay.)

**Gabesta** · 01-22-2011 06:42 PM

Phil: Making our lives easier, one post at a time.

**fly300kts** · 01-22-2011 07:14 PM

Thank you Guys, just trying to help the Community

Phil

**fly300kts** · 01-23-2011 04:06 AM

Originally Posted by PPLAPW

Awesome post Phil, I appreciate the effort you put into this.

Hopefully this will decrease all those headlight inquiries you get...

I doubt it

Phil

**CoDRoX** · 01-23-2011 02:24 PM

Great post

**excelb7** · 01-23-2011 02:40 PM

hmm, I thought there was a oem Halogen projector equipped with b7's as well. So if its an oem projector, its always bi-xenon?

**fly300kts** · 01-23-2011 02:49 PM

Originally Posted by excelb7

hmm, I thought there was a oem Halogen projector equipped with b7's as well. So if its an oem projector, its always bi-xenon?

Sorry, I have nothing in store if you don't know how to read

Phil

**excelb7** · 01-23-2011 03:16 PM

Originally Posted by fly300kts

Sorry, I have nothing in store if you don't know how to read

Phil

I know how to read thanks. I must've just seen an after market headlight then.

**arce909** · 01-23-2011 03:43 PM

Originally Posted by fly300kts

Sorry, I have nothing in store if you don't know how to read

Phil

Hahaha!!!

**Inked** · 01-23-2011 03:48 PM

great write up...answers my questions!

**brownishwater** · 01-24-2011 07:13 AM

It's too bad only a handful of people will read this before asking whether they have xenon headlights or not.

Great write-up nonetheless.

**Otter11** · 01-24-2011 08:57 AM

Great write-up nonetheless.

a positive comment comes in from brownishwater hahaha

Nice write up Phil. Thanks

**Rahbey** · 03-15-2011 12:16 PM

Awesome post Phil! My city lights are out for delivery now and should be here shortly. I was planning on just going to the garage and fiddling with the different bulbs but I can already tell this post saved me a lot of time.

Crossing fingers on no code .....

**Audibot** · 03-15-2011 12:25 PM

Originally Posted by beantown

Thanks Phil; excellent reference guide. (Especially to keep all the noobs at bay.)

Lofty assumption haha

**fly300kts** · 03-15-2011 12:26 PM

Originally Posted by Rahbey

Awesome post Phil! My city lights are out for delivery now and should be here shortly. I was planning on just going to the garage and fiddling with the different bulbs but I can already tell this post saved me a lot of time.

Crossing fingers on no code .....

Glad I was able to help

Phil

**TheKid23** · 08-10-2012 06:22 PM

Bi-xenon pic showing for everyone else? All other pics are working.

**fly300kts** · 08-19-2012 05:52 AM

Yes all the pics are working

Phil

**TheKid23** · 08-20-2012 08:41 PM

I PM'd you a question Phil!

**fly300kts** · 08-30-2012 03:07 PM

Replied

**clemsongt** · 04-02-2015 04:50 AM

Originally Posted by fly300kts

When you select High Beam, via an electro magnet, the grey flap tilts forward: This is the HIGH BEAM POSITION

Anyone know what troubleshooting I should do in order to diagnose why the highbeam won't engage on one of my bixenon headlights?

**fly300kts** · 04-03-2015 12:45 PM

Originally Posted by clemsongt

Anyone know what troubleshooting I should do in order to diagnose why the highbeam won't engage on one of my bixenon headlights?

I replied to your other post
Only way will be to open the housing

Phil

**Bloomquist** · 01-03-2020 12:21 PM

Originally Posted by fly300kts

It seems that there is some confusion between the different headlights installed on the A4 B7 so here is a little guide that should answer most of the questions:

OEM Bi-Xenon

YELLOW ARROW: Bi-Xenon - Bulb Type = D1S
GREEN ARROW: Turn Signal - Bulb Type = 1156 (12V 21W)
BLACK ARROW: DRL (Day Time Runing Light): Bulb Type = 1156 (12V 21W)
RED ARROW: City Light - Bulb type = 158,168,194 (12V 5W)

WHY BI-XENON?

The headlight use the same bulb for Low & High beam. Here is how it works:

This is a picture of the beam housing removed from the headlight. You can see the D1S bulb installed. Also note the grey metal plate in the front.

Same housing, side view: you can see that the grey flap is in contact with the housing: This is the LOW BEAM POSITION

When you select High Beam, via an electro magnet, the grey flap tilts forward: This is the HIGH BEAM POSITION

HALOGEN

YELLOW ARROW: Low Beam - Bulb Type = H7 (12V 55W)
BLUE ARROW: High Beam - Bulb Type = H7 (12V 55W)
RED ARROW: City Light - Bulb type = 158,168,194 (12V 5W)
GREEN ARROW: Turn Signal - Bulb Type = 1156 (12V 21W)

I think I covered everything and now it makes sense for everyone
Let me know if any question

Phil

Anyway we can make this comprehensive again...? IE get pictures back?

**Arese** · 01-04-2020 06:21 PM

Hey everyone, I managed to remove the drl bulbs but I don't seem to be able to remove the city lights.
It's really cranked in there and I have no visibility.
I can touch the back of the support holding the bulb but I'm not in a good position to rotate the support to unlock it.
Any tips?
Do I have to rotate it 1/4 just like the DRL light to take it out?
Thanks guys IMG_20200105_131640.jpeg

Sent from my MI 9 using Audizine mobile app

**Arese** · 01-04-2020 06:44 PM

All good I found a video online that says that you just have to pull and no need to twist the socket. I didn't want to pull on the cable so I managed to grab the plastic socket with a plier and pulled jiggling it a bit and came out. Now the other side.

Sent from my MI 9 using Audizine mobile app

**KOT** · 01-13-2020 08:56 AM

Hey Phil. Can u send me ur number. I need one part to buy that located inside headlight and can’t explain how is looks and easier will be to send u a pic if u might have it. Thanks