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No warning tones, No radio sound, No bluetooth & No HUD - Modules?
2012 BMW X5 35D w/Comfort Access After reconnecting the battery (replaced the rear air compressor), I ran into all sorts of issues that didn't previously exist. I currently have:
* I can adjust certain settings and the Navigation works just fine. I purchased a fibre optic loop, and began by plugging it into the fibre optic cable that leads into the Amp and then the TCU (I believe it is the TCU...sits next to the Amp in the rear left panel) and they seem to be working just fine (both have red blinking lights). There's one other component that is tiny with a pink connector, but from what I've heard, it is the satellite module or something to that effect (doesn't seem to have a fibre optic cable). I'm now trying to figure out what other modules are tied into the same fibre optic system (circle...loop), so I can continue testing. I've also read somewhere online that the MOST connector located on the passenger side footwell area is also in the loop, so I check...pulled both apart and placed them together then inserted the loop I purchased...nothing happened, but I did notice that there wasn't a red light or blinking red light. If this is an actual fibre optic line, then I have to assume the problem lies there, but what does this MOST connector connect to and where exactly under the dash is it? Please provide any input that can help me find the issue. I've been going at this for a while now...started with faulty codes caused by replacing the rear air compressor and then the leveling system not calibrating correctly. 2012 BMW X5 35D w/Comfort Access Thank you in advance! Oh...I've checked all the fuses...all good, but some areas aren't getting any power. I'm not getting the SOS malfunction light. Also, I forgot to mention that at one point I got fed up and took it to a local BMW indy that has been in business for over 40 years. They completed a diag and told me that the TCU, Amplifier or HUD Modules may be the issue...not all three, but that something got fried, but they can't pinpoint it. They wanted to charge $100 an hour to pinpoint the problem and I needed to leave it overnight. I'm sorry, but I prefer to figure it out on my own than to spend $1000 on pinpointing the problem and then as he mentioned, an Amp is an extra $1000! Crazy! |
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#2
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As you pull the most connectors, they will show a red LED dot. Eventually, you will find one without any red led. You then need to identify the component upstream that is not repeating the fiber signaling. A flashlight into the fiber will show as a white dot on the other end. That can be used to trace the signaling.
Post a pic of the amp and other modules and we can provide other assistance.
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2009 35d, 2006 325i & 330i |
#3
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#4
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1st photo: Amp & I believe TCU and the small above, I really don't know, but think it has something to do with satellite or something. 2nd photo: Passenger side 3rd photo: Passenger side (same as #2 but close up of the fibre optic that is not red or blinking (I had the ignition on) 4th photo: Under drivers side steering I'm sure there are more, but don't know where. Last edited by 12X535D; 12-11-2020 at 02:29 PM. |
#5
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Your Most modules are a Logic 7 amp and a Combox. The loop under the pass seat is just a diagnostic port that needs to be connected together to pass the signal. The last pic is the camera module that is not on the MOST loop.
Do you have heads up display? If not, you only have 2 most modules. Is there a red dot at the amp, combox and diagnostic fiber?
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2009 35d, 2006 325i & 330i |
#6
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Is the TCU the Combox? Confused here! |
#7
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Combox replaced the TCU and MULF in newer E70. HUD also uses Most fiber so that is a 3rd module you need to troubleshoot. I assume there is no image in the HUD? Do you have the DVD player in the glove box? That is also a Most component. Forgot about that one but I don't think that is your issue.
The connector under the glove box is X16956. See the attached diagram. Those segments of fiber go between the CIC and the HUD. So one of those components is not passing the signal. Check HUD fuses. If good, the next easiest thing to do is remove the face trim of the CIC. Open glovebox, grab edge of vents and pull out. Remove 2 screws at top of trim and remove trim. You can now see a 4mm hole in the front of the CIC metal to the left of the hard drive. At just the right angle, you should see a blinking LED coming from the Most origination area of the CIC PCB. The LED is 4" or so back on the board.
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2009 35d, 2006 325i & 330i Last edited by smassey321; 12-13-2020 at 09:50 PM. |
#8
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You are correct, there's no image on the HUD, and I don't have a DVD player in the glove box. The DVD is the same as the CD player just under the radio. All fuses are fine except for the fact that there are about 3 fuse slots under the glove box that are not getting any power and 1 in the rear. The one in the rear I believe is the Junction Box fuse. Thank you for the attachments, and description of what to do next. I will try the CIC in a while, and report back. |
#9
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As I continue to think about this, a Most failure of the CIC would be uncommon. Research how to access the Most connection to the HUD. That may be an easy thing to bypass for diagnostic purposes. Google E71 or E70 HUD retorfit for some info.
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2009 35d, 2006 325i & 330i |
#10
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After researching the CIC...oh my!!! I was thinking, please let it be the HUD as I don't need it that bad. I will look to access the HUD MOST connection. I think the fibre optic loop I purchased would possibly work to bypass the HUD connection...if that's the issue.
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