C5 Aircross: Full-LED Headlights - Dipped Beam Fault "B1137 12"

[JimmyTulip]

Hello,

I have a C5 Aircross from 2019 with Shine-Pack and Full-LED headlights.

VIN: VR7**************[VIN obfuscated, can be read by forum staff]

In general ALL lights are working. When driving with High-Beam, visibility is great.
But I am annoyed by the poor visibility when driving with Dipped-Beam. On Dipped-Beam the lights point to low to ground and it is dangerous to drive, because you might see an obstacle too late.

At first I thought the headlights might be out of alignment and I was thinking to adjust them by the alignment screws.
But before I did anything I did connect the car up with DiagBox to read the fault-codes and unfortunately there was a fault related to the headlights:

B1137 12 - Fehler Ansteuerung des Abblendlichts vorne rechts (Kurzschluss an Plus)

I'm sorry, but the error on the sceenshot above is shown in german. The error should translate to something like:

B1137 12 - Right dipped beam control fault (Short circuit to positive)

I can clear the fault, but it comes back immediately, I think, after ignition off - ignition on or when switching on the headlights.


The handbook says, that in the event of a fault, the system places the headlamp beams in the lowest position:

And I think this is what is happening here and this may cause the poor visibility. Despite I DON'T get a warning on the instrument panel.
I can NOT remember, if the lights did a self-test on startup? I think they went up and down after ignition on, but I am not sure anymore.
However, at the moment they don't do something like that on startup.


I did have a close look on the headlight-connector, but I did NOT find anything suspicious:

I followed the cabling back behind the engine without taking anything apart and I was not able to find any visual damage or anything suspicious ...

I also took a photo of the part number of the headlight itself:

Normally I am a DIY-guy, but I do NOT have access to any information from Citroen. (service manual, wiring diagrams, ...)
I was not able to find anything helpful on the Internet.

Any tips? How should I proceed?

Thank you

[GiveMeABreak]

There's probably not a lot you can do with this - apart from getting the dealer to check it out as the LED units are pretty much self-contained. There is a driver unit and the headlamp, so either could be faulty, or an issue with the BSI. The fault descriptor is below. If it's the headlamp internally, then it's a new lamp I'm afraid. But I would check the connector and the pins very carefully to ensure they are making contact and that there is no corrosion. Give the connector a spray with some electrical contact cleaner spray and try to see if this makes any difference.

Fault Code:	B1137 12
Description of Fault:	Front right dipped headlamp control fault: Short circuit to positive. Lamps not controlled. Short-circuit to positive detected for 2s. Conditions of activation of the diagnostics The following conditions have to be met: - Vehicle stationary - Ignition on - Not in economy mode - Triggered
Conditions for Fault to clear:	Absence of malfunctioning and activation of the control (For 2 seconds)
Downgrade Modes whilst Fault is active:	-
Symptoms:	Malfunctioning of the dipped beams Malfunction of the cornering or junction lighting Malfunction of the front foglamps Automatic lighting failure
Suspect Areas:	Built-in systems interface Headlamp

[JimmyTulip]

Hello @GiveMeABreak,

Thank you very much for the fault descriptor!

Yes, I have cleaned the connector using contact cleaner, but it did not make any difference.

When I read about "Short circuit to positive" I was all-in on the wiring-side.
The fault descriptor also does not contain anything about the wiring?
May I rather exclude a fault from the wiring-side?

Do you perhaps know for sure, if the lights normally do a self-test on startup? (move up and down)

Thank you

[GiveMeABreak]

No, not on these, that used to be a feature of the Xenon directional lighting, not the LEDs which are static I believe. I think only some later top models have active matrix LED lighting.

[JimmyTulip]

Assuming I would get a new headlight with the same part number as mine "9816925280" (new or second hand):

I know the headlight(s) would have to get adjusted using a car headlight tester, but ...
Would the new headlight has to be coded somehow into the system or will it work out of the box? (Plug and Play)

Thank you

[GiveMeABreak]

Not as far as I'm aware.