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11-24-2022, 12:47 PM | #1 | |
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E93 M3 - Vent Flaps Issues
Hi all,
I am a new owner of a BMW M3 E93. It's 2009/01 (See quote appendix for mdecoder specs). Since I bought the car the front vents are not blowing air through. I found various forum posts with the same issue and tried to diagnose it, but without any luck. Since no two issues are the same, I thought that I could ask you all for your thoughts. I'll try to structure my post a bit, for convenience: ISSUE SUMMARY
Further to the above and with various help from the forum and other sources, I then tried to:
I am attaching a few other INPA screen captures with information on the IHKA unit. Outstanding troubleshooting suggestions More of a personal note but in case anyone wants to check in the future:[*] Someone elsewhere suggested that I change the final stage resistor;[*] Take out AC unit and verify pin connectors;[*] Find diagram and verify cables, LIN BUS. Will update with more info once attempted. Quote:
Last edited by Winnn; 11-26-2022 at 12:39 PM.. Reason: Forgot Attachments |
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11-25-2022, 02:55 AM | #2 |
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gbalthrop - George, I must first say a huge thank you for all your work on this forum and for responding to my DM surrounding this issue. I am very grateful. If you ever find yourself in the UK, please, do shout out so I can buy you a few drinks!!
This is my post with all details about the issue and troubleshooting. Studying your other work, I believe that this might either be a LIN BUS wiring issue, or fault flap motors. Not entirely sure what steps I could take next. I was thinking to take the climate control module out and verify the connectors behind it. What do you think? Last edited by Winnn; 11-26-2022 at 11:12 AM.. |
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11-27-2022, 01:18 AM | #3 | |
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That Connector includes: 1) LIN BUS: Yellow wire at X01198/1 (Pin #1 of connector X01198); 2) Ventilation Temp Sensor: Green wire at X01198/7; 3) Footwell Temp Sensor: White wire at X01198/5; 4) Evaporator Temp Sensor: Green/White wire at X01198/4; You have Fault Codes for ALL of those items. ALSO, that connector supplies power to Flap Motors via Red wire at X01198/3 and Ground via Brown wire at X01198/2. The K-CAN BUS connection to IHKA Module is via a DIFFERENT Connector, X608, which is the OTHER 12-pin connector on rear of IHKA Module, with similar latch. Check BOTH 12-pin connectors after removing IHKA Module. If you need ISTA removal procedure, please advise. I have never removed the Module or seen the Connectors. There have been SEVERAL posts on the Forums by folks who had issues with the LATCH on those connectors. Please let us know what you find, George |
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11-27-2022, 06:46 AM | #6 |
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gbalthrop Issue resolved. I took out the climate control unit and although everything looked like it was seated correctly, for some reason it was not. I reseated all pins and now all flaps are operational. Tested everything again with INPA to make sure that they all work, with no further errors.
Very grateful for your content, thank you for your help. Last edited by Winnn; 11-27-2022 at 06:54 AM.. |
11-27-2022, 04:47 PM | #7 |
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Winnn Congrats on the new car! Like you I am a recent owner of a 2008 E90 M3.
gbalthrop THANK YOU! I am simply amazed and thankful for all the insight you share. I’ve read many of your posts as I’ve been researching this issue. My problem describes pretty much identically to this post. IHKA buttons all light up, fan audibly changes speeds but no air coming out of any front vents. Rear blows strongly but no real heat or cool from rear. No audible noise of flaps working. I did change the final stage resistor but no luck. From George’s earlier guidance I installed INPA (I’m very much a novice) but I did fine IHKA errors 9c56, 9c5f, 9c62, 9c48, 9c49, 9c4a, 9c4b, 9c4c (Basically same as Winnn reports here). Also I get the same flap position printout of all listing !255. So basically identical. note, I did recently have the head unit/radio, IHKA unit, and others, pulled out as I swapped the screen for a touch screen (carplay, rear camera, etc). Troubleshooting this, I had them out numerous times. I actually just today pulled all out again to re-check, re-seat connections. Still no luck. Questions: What do you mean by ‘reseat pins’. I’m googling that now lol. Any more detail on exactly what you did? Did you actually take the plug apart? Test with a multimeter? Any way to identify connector X01198? There are two similar connectors on this IHKA unit. One dark, one light. I guess I’ll check both. There is also a socket for a 3rd plug. Looks like a ribbon plug. Today I pulled a lot apart, looking for this cable thinking I missed it on the re-install but no luck. Looking back at my original install pics and other posts I’m now convinced that mine never used this but curious if yours does have 2 or 3 connections to IHKA unit. Thanks again for any help! |
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11-27-2022, 05:20 PM | #8 |
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Got it! Of those 2 connectors to IHKA, one of them was simply not seated correctly. It was like one side of the locking mechanism grabbed but the other side must have missed. Upon closer inspection it was a bit lopsided. Once I reseated it, all is working!
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11-27-2022, 05:23 PM | #9 | ||
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This does sound exactly like what I experienced and the fact that you recently pulled these out makes me pretty confident that it is a similar issue. To directly answer your questions:
I will try to outline step by step what I've done, although, by the sounds of it, you already tried it all: Will provide a bit more detail than you might actually need for anyone else who will come across this in the future.
This was it for me. I then tested the unit and everything worked well. To make sure that everything was functional, I connected the K + DCAN cable to OBD port, booted INPA, and tested all flaps by applying the various buttons. One other thing that I did as a previous troubleshooting point (before all above) was to try and default code the unit using NCSExpert. If like me, you're not familiar with it, this is just another application part of the BMW Standard Tools suite. Someone else on a different forum was very helpful and provided me with a step-by-step guide on how to do so: Quote:
These are just pics that I took of all cables to look at later in case I missed anything while working on it. Let us know how it goes. Last edited by Winnn; 11-27-2022 at 05:33 PM.. |
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11-27-2022, 05:24 PM | #10 | |
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Might be useful for someone else, who knows! |
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11-27-2022, 06:24 PM | #11 |
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Thanks again. Wow, load off my mind as it’s getting cold here in NY.
Yes, the ribbon cable likely for heated seats which I don’t have, (so far my one regret). BTW, the carplay swap is a really nice upgrade (I had CCC). Highly recommend it. The reverse camera, I’d take it or leave it but it was only an extra $20. Now back to my other project…. (LS swap into a boxster (endurance race car)). |
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11-27-2022, 06:44 PM | #12 |
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Yeah, I was looking into fitting an apple car play unit, but it seems like a proper job that I'm not ready to do myself. Out of curiosity, which unit did you install?
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11-27-2022, 07:38 PM | #13 |
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I went with the andream unit. Pretty happy with it so far. Feel free to reach out if you decide to give it a try.
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11-28-2022, 02:53 AM | #14 | |
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I was looking at these before I got the car and I think that they are fantastic, especially for a better navigation. I however went for a tune2air adapter for bluetooth music, so I think I won’t change this just yet. But mainly due to other costs like bearings, just got a new set of 4 tires and others |
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05-31-2023, 01:42 PM | #15 |
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Winnn thanks for throwing this thread together. I had the EXACT same issue after doing a bit of cable management back there (crap alibaba CarPlay unit sound is not coming in through all channels when volume is turned up a lot but that’s a separate issue).
My culprit is the A/C module connector in the picture. After plugging and unplugging I noticed that there was a bunch of resistance putting it into the seat but it would still latch up. I unplugged and tried again and it almost fell right in to the seat. Connected battery and voila I have flap activation again. I thought the carplay aftermarket bundle tied into the A/C cables somewhere and messing with my control unit but it seems like the simple solution this time. |
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03-02-2024, 04:12 PM | #17 | |
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I’m hoping you can help or guide me… I’m having the same issue as described above however I’ve not been behind the head unit or climate control unit so I doubt my connections have become loose or unseated (although I will check), is it possible that the flaps have failed, assume they are driven by a motor? Thanks |
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06-09-2024, 10:38 AM | #18 | |
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If you haven't, I would suggest running INPA to read the flaps and see if they're operational. For mine, it was too much of a coincidence for all to fail at the same time, so I put more effort into troubleshooting elsewhere first, thinking of flaps last (as that's a big job: entire dashboard out). |
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