No Signal/DRL After Replacing Headlight Control Module

[Dimitrios]

Hello All,

I have a 2019 S4 with LED headlights (non-matrix). A couple weeks ago, after washing the car I got an error message saying the front left turn signal was faulty. Also, the headlight itself had a good amount of condensation in it. I pulled the headlights out to try and determine the issue. LEDs looked good so I pulled the control module and I could see some obvious signs of water damage. Just to verify this was the issue I swapped the module from the other headlight and the issue was now happening on the other side; signal and DRL working again on the original one. I went ahead and ordered a used module on eBay, I actually got a pair, just in case, swapped out the known bad module, cleared the error code and retried; same issue. Does the new control module need to be flashed or coded in some way?

Thanks I’m advance for any help on this. I did try a search first to be sure there wasn’t already a discussion on this but I didn’t see anything, but please forgive me if I missed it.


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[nnlugo]

Needs to be adapted to your car, I went through a similar situation. Had mine done at the dealer. They updated my MMI and fixed my passenger seat detection issue.

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[Dimitrios]

Thanks! Figured it must be something along those lines.


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[Dimitrios]

Anyone know if this can be done using VagCom or OBDeleven?


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[a4audi4fun]

Component Protection updating is a dealer operation - guess it's being done this way to reduce black/grey market impact from stolen parts.

[Goonz]

Anyone know if this can be done using VagCom or OBDeleven?


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It may require VAS interface for calibrating such components to headlights. I know I'll be utilizing this tool for my upcoming Matrix LED headlight install.