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Post by sanmark on May 2, 2024 12:10:42 GMT
Hello all, I am having issues with my 2017 A3 8v front Drl on right side. Few months ago I noticed It started to flicker without warning on dash board, but then it went out completely and the message appeard at the dashboard. But when you go to mmi screen and turn of the DRLs and then again on it works again. I knew it wasn't fixed but it worked. Recently I have removed the headlight and inspect the Drl module, leds looked like new without any burning marks, all looked great, nevertheless I have replaced the drl module with new one, and funny enough it started doing the same after a few days. Everything is the same as before replacing the module. Like its loose contact but where when how .. I really don't know what to look for loosing my mind I have scanned the car, and the fault is intermittent B12EF2
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Post by dv52 (Australia) on May 2, 2024 21:44:27 GMT
sanmark : Hi. Are you sure the error is B12EF2? Maybe post-up a copy of the SCAN report so we can see how this car is built and we see the precise error message. So, please provide an unedited (meaning NO changes to the original OBD11 report) SCAN for this car. Before you make a fresh SCAN, make sure that you enable the Freeze frame option -see HEREThis is how to access and digitize SCAN data from the History data in your account: - Fire-up OBD11 software - no need to connect to the dongle
- On the Home screen - select Garage/Vehicle (bottom-left)
- If you have registered multiple vehicles to your account - select the car
- Scroll-down the car-information screen and select History
- Follow the steps below (after receiving the email that you sent to yourself - print the contents):
When you receive the Email that you sent to yourself in the last screen above - insert the file as an attachment to a new post Don
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Post by sanmark on May 3, 2024 6:50:02 GMT
Hi Don, I am not sure if I got this correctly but thanks for your answer. I can't access the freeze frame how to, It directs me to 400 bad request.😕 And if I understand you, I need to go to history, check mark full scan only ? And then send the last one to myself? 🤔 I managed to find freeze frame and enable it. This is latest scan. history.txt (10.2 KB)
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Post by dv52 (Australia) on May 3, 2024 23:35:39 GMT
sanmark : OK - thanks for the SCAN report. Yes the data confirms the words in your first post. Clearly this is NOT a coding matter - it appears to be a problem that is "downstream" of the central electrics module. To explain - below is a diagram of the general arrangement for part of the headlight for LED type DRLs (Daytime Running Lights): As you can see, the physical set-up is that in-between the central electrics module and the headlight fitting is a couple of wires, the DRL control module (which your SCAN calls "Right LED daytime running lamp and parking lamp LED module") and the module that contains the actual LED lamps.
On your SCAN, the central electrics module is complaining that the power supply to the DRL control module is failing intermittently. This power-supply comes from blue/red wire in my picture (which is connected to pin #32, socket B on the 09 module and pin #10 on the headlight connector).
So and as shown in my picture, I suggest that the possible parts of the circuit to investigate are: - The terminations on the blue/white wire,
- The plug and connections for the DRL control module,
- The DRL control module itself
Of course, the overarching issue in this instance when fault finding is the intermittent nature of the problem. Ain't much that can be done about this - hopefully if you try "jiggling" stuff - the fault will become "static"!
Don
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Post by sanmark on May 4, 2024 5:58:15 GMT
Thank you Don for your thorough answer. So if I got this correctly, there is a possible issue with BCM (check connection socket B), and connections to the DRL control module (I suppose that's the metal plate thing on the headlight which you plug the power into the headlight housing) ?
To sum it all up, maybe a bad connection, connectors to or BCM, power control unit on the housing it's bad.. I can exclude led light module which contains LEDs, and the headlight housing itself. Damn...seems complicated 😌 If BCM is bad would it be acting up with other stuff maybe or not necessarily? It's very hard to get to it, so I am crossing my fingers it's not bad😀
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Post by dv52 (Australia) on May 4, 2024 7:35:08 GMT
sanmark : First, let's understand that remote diagnostics on a forum like this ain't a good way of finding faults. So, I'm guessing!! Basically, I'm starting with the assumption that anything is possible - that said, some things are more probable than others. One of the less probable options is a problem with the BCM, or the connection at the pin/socket to the BCM. Of course it's not impossible - but it's unlikely that the BCM equipment is faulty because the connections on the BCM socket are securely fixed and it seldom moves (plus the environment in the cabin where this equipment lives is not harsh). The more likely cause is a problem with the headlight connector end of the blue/red wire and/or the equipment/connections in the headlight fitting because these items tend to feel stuff like engine vibrations, wild swings in temperature and weather effects like rain and moisture. A trick that's often used to check the health of the DRL module is to swap the left and right side modules - then re-SCAN the car. If the fault follows the swapped module - the module is faulty. If not, the fault lies elsewhere on the wire/headlight fitting Don
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Post by sanmark on May 5, 2024 5:42:12 GMT
Don, you are absolutely right about remote diagnostic's 😁 But this is more like sharing opinions. Nevertheless thank you for your help 👍, now I have some starting point and will investigate further, I'm going to start with led control power module. Although I thought this module was more like a ballast for xenon lights or full led headlight main beam. Really didn't know it also controls the small DRLs...
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