How to replace the Xenon headlights of an Audi A4 B9 with the factory Full LED units: parts, BCM1 swap, wiring, Component Protection removal and parametrization

This guide describes how to retrofit the original Full LED headlights on an Audi A4 B9 that left the factory with Xenon headlights. Swapping the headlights alone is not enough: the Full LED units are driven over CAN bus by their own control modules, so the retrofit also requires a Highline BCM1 (central electrics module, address 09), an adapter wiring harness, Component Protection removal with ODIS and the upload of the correct dataset for the new BCM1.

Contents

• 1. Needed parts and price
• 2. Before you begin
• 3. Procedure
  • 3.1 Remove the front bumper
  • 3.2 Fit the new Highline BCM1
  • 3.3 Wiring harness
  • 3.4 Component Protection removal
  • 3.5 Parametrize BCM1 and headlight modules
  • 3.6 Restore the original BCM1 coding
• 4. Final result
• 5. Summary

1. Needed parts and price

The total cost of the parts listed above was about 1000 €.

2. Before you begin

• buy the Kufatec wiring harness or build the cables and connectors yourself;
• back up all coding and adaptations of your current BCM1 (VCP or VCDS): you will restore them on the new module at the end (section 3.6);
• you need ODIS with a VAS5054 / VAS6054 interface and a GEKO login to remove Component Protection (section 3.4);
• you need the dataset for the new Highline BCM1 with a configuration that matches your car's options.

This is the Kufatec adapter harness used for the retrofit:

3. Procedure

The retrofit is made of five steps:

1. remove the front bumper;
2. fit the new Highline BCM1 and lay the wiring harness;
3. remove Component Protection;
4. parametrize BCM1 (09) and the headlight modules D6, D7, 29, 39;
5. restore the original coding of the BCM1.

3.1 Remove the front bumper

The headlights can only be removed with the front bumper off.

3.2 Fit the new Highline BCM1

The Xenon BCM1 must be replaced with the Highline version, which supports the Full LED headlights:

Pinout of the Highline BCM1 8W0 907 063 CG, with connectors T54c, T73a and T73b:

3.3 Wiring harness

The Kufatec harness comes with 4 additional cables with crimped pins:

The single cable on the left of the photo is not needed: it runs from the A5 module (front camera) to the 09 module and is only used for Matrix LED headlights, not for Full LED.

The correct wiring is:

The two positive cables go to fuses SB12 and SB13 of fuse holder ST4 in the SR1 fuse carrier:

CAN bus connection of the left headlight module (MX1) and of the right headlight module (MX2) to the BCM1 (J519):

3.4 Component Protection removal

The new BCM1 comes from another car and is protected by Component Protection: to remove it you need ODIS with a VAS5054 / VAS6054 interface and a GEKO login. In the test plan, run the 19 – Component protection test and follow the online procedure.

3.5 Parametrize BCM1 and headlight modules

You need the original dataset for the new Highline BCM1, with the configuration that matches your car's options (see section 2). Upload it with ODIS:

1. in ODIS select control module 09 (Central Electrics);
2. on the right, open 010 – Data transfer;
3. select the XML dataset file to upload;
4. click Write data set.

The modules to parametrize are BCM1 (09) and the headlight modules D6, D7, 29 and 39: if your dataset includes parameters for the headlight modules, upload them with the same procedure.

3.6 Restore the original BCM1 coding

Load the original coding and adaptations you backed up with VCP or VCDS (section 2) and restore them on the new BCM1, so that all the other functions of the car keep working as before.

4. Final result

5. Summary