Adjust Xenon Headlight Range using a VAG-COM

http://forums.audiworld.com/showthread.php?t=1852176

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Instructions: How to Adjust Xenon Headlight Range using a VAG-COM

DISCLAIMER: This article is for informational purposes only. Please use at your own risk!

How to Adjust Xenon Headlight Range using a VAG-COM

I can confirm that this tweek works on an '01 TT 225 and '03 A4 Avant 1.8T. Although I have not tested it, this should work on all current Audi cars with OEM self-levelling Xenon lights.

When I recently took delivery of my '03 A4 Avant 1.8T, I noticed that the headlights were aimed too low. Foreground illumination was excellent, however I was having difficulty picking out signs further down the road. They were certainly not aimed as optimally as the Xenons on my TT (after several trips to the dealer to get it right).

When I parked the A4 alongside the wall of an industrial building at night, a sharp downwards slope was evident. The lights were aimed approximately 20-30 degrees from horizontal, too low for my taste.

Here is the procedure to adjust the vertical aim of OEM Xenons

1. Park the car on a level surface, 10 to 20 feet from a wall if possible. Connect the VAG-COM as usual, with both ignition and xenons on.
2. Select control module 55 - H. Light Range. This is somewhat hidden under "Less Common Modules"
3. Take note of the value in the Soft Coding cell. This is the headlight level as set by the dealer when they performed the PDI. If you manage to muck things up you can always go back to this default value
4. Click on "Recode - 07" and you will be able to modify this soft coding value. A smaller value aims the lights higher, and lower value aims the lights lower. Click on "Do it!" to see the lights move up or down.
5. Don't over do it. I suggest that you choose a value that still has a gentle downwards slope to avoid blinding other people on the road. I changed my original value from 00060 to 00020 and it's perfect.
6. Now you need to recalibrate the self-leveling reference point, or else you will throw a code the next time you start the car.
7. To do this, select "Basic Settings - 04" and scroll up to "Group 001". In a few seconds the first cell will change from "wait" to "set". Now scroll to "Group 002" and wait until the controller says "Learned"
8. Enjoy your improved visibility!

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You cannot adjust your xenons with the vag...the "Recode - 07" is used to specify what type of vehicle you have to the control module

B5 S4 Quattro's - should specify "00004"

Here's the table of AVAILABLE options according to the Krauts

55 - Xenon headlamps (lyslængderegulering)] ->
[07 - Kodning] -> [07 - Coding] ->

00001 = A3 forhjulstræk 00001 = A3 front wheel drive
00002 = A3/S3 4-hjulstræk 00002 = A3/S3 4-wheel drive
00003 = A4 Limousine/Avant forhjulstræk 00003 = A4 Sedan / Avant front wheel drive
00004 = A4/S4 Limousine/Avant 4-hjulstræk 00004 = A4/S4 Sedan / Avant 4-wheel drive
00005 = A6 Limousine/Avant forhjulstræk 00005 = A6 Sedan / Avant front wheel drive
00006 = A6 Limousine/Avant 4-hjulstræk 00006 = A6 Sedan / Avant 4-wheel drive
00007 = A8 forhjulstræk 00007 = A8 front wheel drive
00008 = A8/S8 4-hjulstræk 00008 = A8/S8 4-wheel drive

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http://www.ross-tech.com/vag-com/cars/xenonalignment.html

Xenon Headlamp Adjustment
Updated  03 Oct. 2007

Ross-Tech is not responsible for any damage or problems that may result from following these instructions. They are to be used at your own risk. As always, you should refer to a Factory Repair Manual for your vehicle!

This procedure applies only to older Xenon systems that use KW-1281. Procedures for specific vehicles, including newer cars that use KWP-2000 or CAN systems can be found in the Ross-Tech wiki.

This procedure details how to perform a Xenon Headlamp Adjustment on many VW/Audi vehicles equipped with Xenons (HID's). This procedure cycles the motorized headlamp adjusters to their center position so that the beams can be adjusted. This does NOT align the headlamps by itself. You still need to manually adjust the headlamps via the adjusting screws as referenced against a suitable aiming target.

If this procedure is only partially performed, there may be a DTC stored in the Xenon Range memory indicating "Headlights not adjusted". To clear this, you need to complete the entire procedure.

There are certain test conditions that must be met before doing this procedure:

·         Vehicle must be parked on level ground and "settled" on its suspension

·         Parking brake should be OFF

·         Ignition should be in the "On" position

·         Headlamps should be "Off"

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Procedure for Aligning Xenon Headlamps:

[Select]
[55 - Xenon Range] (For some newer vehicles,  use [29 - Left Light] instead )
[Basic Settings - 04]
Group 001
[Go!]

Wait at least 20 seconds for the headlamp motors to move. The headlamps are now in their adjustment position. Turn on headlights. Adjust them via their manual adjusting screws as referenced against a suitable aiming target.

Scroll up to Group 002. The Xenon Range controller has now learned this position as its Home position.

Click the [Done, Go Back] button and you're all set.

Note: There have been reports of lowered vehicles displaying an error message in either Basic Settings group 001 or 002. If the vehicle height sensor(s) are bottomed out, it may be necessary to bend the sensor bracket to allow normal adjustment to occur. Also, check to make sure that the sensor arms do not have their pivots facing the wrong direction as shown in this thread: http://forums.vwvortex.com/zerothread?id=2383036--- -

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