Left Headlight Issue on B9 S4

[Dimatizer]

I've been having a problem with my left headlight and was wondering if anyone had an insights they could provide.

I'm getting 3 errors from the car:

Audi adaptive light: malfunction!
Left front turn signal defective.
Left side marker light/daytime running light faulty.

ODB Eleven gives me an error with the Control module for light activation, left. It says No Communication with an error code U116E00 although I wasn't able to find this code anywhere.

I looked at the wiring diagram and it seems like the culprit is the Left light control unit (J1018). It indeed controls Left headlight range control motor(V48), Front left side marker bulb(M33), Front left turn signal bulb(M5) and Left LED module for daytime running lights and side light(L176).

This module is attached to the bottom of the headlight and to me it seems like it crapped out and needs to be replaced. I just wanted to see if there are any other considerations I should look at.

I tried looking for a fuse for the J1018 module but the only ones I see are a fuse the the entire headlight MX1 and a fuse for the Onboard supply control unit(J519).

If the fuse for J519 was blown I'd assume i would have tons more stuff not working. As for the headlight MX1 fuse, I would also assume that the entire headlight would not work. The low beam and high beam still work fine and even the side marker turns on on some occasions. If this assumption isn't right and there is a fuse I should check, please let me know.

A bit of background too. The problem was a little different when it first started too. The turn signal and daytime running light worked still but the adaptive light and side marker errors were present. When I first checked the codes I got a slew of them for the Light Control Left category: Temperature sensor-Electrical error(C11C101); LED daytime running/park. light-Output voltage/output power implausible (C11BDF6); Supply voltage-Voltage too high(U101200); Bulb for side marker light-Open circuit/short circuit to B+.

After I had reset the codes and rescanned, then I got only the no communication from the control module.

With that info, if I did buy a new control module, should I be concerned that the root problem might be somewhere higher up and could result in the same issue? I have not been able to find any diagrams for the connection between the headlight and the control module so that I would be able to test the voltage it is receiving. Is there a general voltage range I should be seeing with coming from the headlight to the module?

Tonight I plan on trying to remove the module from the headlight to take a look at the connections.

If you have any answers to the questions I asked in the post or any general insight, it would be greatly appreciated.

[danilo07]

I am having the exact same issue. How did you fix yours?
Thank you in advance

[MightyKaP]

@Dimatizer did you ever figure this out? I'm having the same issue now

[Bculen]

Having the same issue has anyone figured out a fix?

[Dimatizer]

I am having the exact same issue. How did you fix yours?
Thank you in advance

@Dimatizer did you ever figure this out? I'm having the same issue now

Having the same issue has anyone figured out a fix?

Sorry for the late reply everyone. I did end up solving the issue. The control module was the problem. When I removed it, the plastic on the connection had some burn marks.

I purchased a new module and installed it. I had to get the module coded to the headlight and it has worked fine since.