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#1
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Tap into Head unit to get raw Audio bit stream?
I have an X3 with a terrible stereo. No tweeters. Very ordinary. I want to pop the lid on the CIC (NBT/EVO?) and on the circuit board, find a test point, or somewhere I can tap into to get a raw bit stream, prior to any amps/crossover inside the head unit (note I do not have the BMW amp in the back that the hifi/top hifi options include).. I am an electronics nerd. Can design circuits, design multilayer circuit boards, have SMD and reflow equipment, microscope etc. Has anyone done this before? The UI is great, the Android Auto works great. I just need to get that bitstream.... For example, in the attached picture, I want to find the points inside the head unit where the signals are as shown by red dots in picture... Cheers + thanks, Scott.
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2019 G01 3.0d ,2010 E70 3.0d, (RIP 2006 3.0d e53) |
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#2
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You want wire colors, locations, and what-not going from the pre-amp to the amp? Easy...
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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit 2007 BMW X3 3.0Si -- MT6 |
#3
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S677 HiFi System Professional DSP
A18 Amplifier
Plug connector overview Number X-pin, colour Description X10266 42-pin, Plug connector Amplifier Pin assignments at plug connector X10266 Pin Type Description /Signal type Connection /Measuring notes 1 A Signal, speaker - Subwoofer, front left 2 A Signal, speaker + Subwoofer, front left 3 A Signal, speaker - Tweeter, rear left 4 A Signal, speaker + Tweeter, rear left 5 E Terminal 30 Fuse F81 6 -- Not used 7 -- Not used 8 -- Not used 9 E Signal, AF radio, front right + Radio 10 A Aerial switching signal Aerial diversity 11 A Signal, speaker + Tweeter, front right 12 A Signal, speaker - Tweeter, front right 13 A Signal, speaker + Mind-range speaker, rear right 14 -- Not used 15 -- Not used 16 -- Not used 17 E Signal, AF radio, front right - Radio 18 E/A K-bus signal K-bus connector 19 -- Not used 20 -- Not used 21 A Signal, speaker - Mind-range speaker, rear right 22 A Signal, speaker - Tweeter, rear right 23 A Signal, speaker + Tweeter, rear right 24 A Signal, speaker - Subwoofer, front right 25 A Signal, speaker + Subwoofer, front right 26 M Ground Ground point 27 -- Not used 28 E Mute Telephone 29 E Signal, telephone AF - Telephone 30 E Signal, AF radio, front left - Radio 31 A Signal, speaker + Mid-range speaker, rear left 32 A Signal, speaker - Mid-range speaker, rear left 33 A Signal, speaker + Tweeter, front left 34 A Signal, speaker - Tweeter, front left 35 -- Not used 36 -- Not used 37 E Signal, telephone AF + Telephone 38 E Signal, terminal 50 via vehicle immoblizer Radio 39 A Signal, speaker - Mid-range speaker, front left 40 A Signal, speaker + Mid-range speaker, front left 41 A Signal, speaker - Mid-range speaker, front right 42 A Signal, speaker + Mid-range speaker, front right
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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit 2007 BMW X3 3.0Si -- MT6 |
#4
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S677 HiFi System Professional DSP
Here is the wire colors.
RT = Rot = Red BR = Brun = Brown OR = Orange BL = Blau = Blue GE = Gelb = Yellow SW = Swarz = Black WS = Weiss = White VI = Violet GN = Grun = Green "X/X" -- First [main] color / Striped color
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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit 2007 BMW X3 3.0Si -- MT6 |
#5
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Thanks RocketyMan.
Sadly, my car doesn't have an external amp. This is the very bottom end unit. Even below the base "hi-fi" which is the default in most of the world! I think because of Australia's bullshit car luxury tax, they stripped out a lot of things to get it down to a price point. In my cupboard I have an Alpine PXA-H800 processor which will do automatic sound correction (like Audessy) etc. That would be an ideal option. I'm preferring to get a digital bitstream somewhere to feed the processor stream, rather than head unit converting to analog, through its crossover to it's internal amps out to the speakers, and trying to then take that speaker level signal back through Analog-Digital->processor->Digital-Analog->amp-speakers. Thanks for the diagrams. I wonder if those outputs to the amp (RadLV+, RadLV- etc) are enabled if you only have the base system, or if you need to have your VO changed/ head unit coded? I also wonder if they are differential line level signals? If nobody knows, I can dig out my Oscilloscope on the weekend... If they are line level signals (differential or not) that would solve my problem I think.. Thanks heaps .. Cheers OzTme
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2019 G01 3.0d ,2010 E70 3.0d, (RIP 2006 3.0d e53) Last edited by oztme; 05-11-2022 at 07:19 PM. |
#6
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Hi Guys,
Well, finally got around to taking my head unit out. Wow. This was a surprise. This is in an Australian delivered X3, 2019 model, with the base stereo (not even hifi). The whole setup is different. Gone are the MOST connectors, and a whole bunch of other things.. This is the internal photos (scroll down for pics) https://fccid.io/T8GMGU/Internal-Pho...ctures-3811252
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2019 G01 3.0d ,2010 E70 3.0d, (RIP 2006 3.0d e53) Last edited by oztme; 05-25-2022 at 02:39 AM. Reason: added photos |
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