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BMW 3-Series (E90 E92) Forum
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In need of a professional audio system wiring diagram
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| 12-02-2022, 01:51 AM | #1 |
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In need of a professional audio system wiring diagram
I'm in need of a professional(base or stereo system) head unit wiring diagram for my 2011, so I can tap in a line output converter. The base system doesn't come with an amp in the trunk, so I'm not sure where to get my signal from.
All diagrams I've found on this site or others have been for the hi-fi systems, which have a few more speakers and amps than mine has. Last edited by GabeMG; 12-02-2022 at 01:36 PM.. |
| 12-02-2022, 12:42 PM | #2 |
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You did not mention the year of the car there are two variation's on the
ampless system. One where the parallel connection between the Front Floors and Doors is made at the under seat speakers and another where it's made in the Front door sills. Sills before 09 and under seat speakers 2010 on I believe . See the link for pre post 09 wiring at the bottom and see the base system gide for more info. System are named as follows base system no amp called stereo Hi Fi 6 channel amp is called Hi Fi option 676 also actually called premium system by BMW Top Hi Fi 9 channel amp fiberoptic input with 9 channel amp called Logic 7 or Hk Head unit may be named professional but it has nothing to do with the rest of the system in all cases except the stereo system. BMW stereo types http://www.e90post.com/forums/showthread.php?t=352586 http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/attach...2&d=1260829447 http://www.e90post.com/forums/attach...1&d=1209780865 http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/ http://technicpnp.com/menuDiagrams/d...e90_92_93.html http://www.musicarnw.com/page-2/ http://www.e90post.com/forums/attach...3&d=1169133185 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/showthread.php?t=641323 http://www.e90post.com/forums/attach...4&d=1278871872 http://www.e90post.com/forums/showthread.php?t=343673 https://www.bimmerfest.com/threads/e...n-752.1275694/ base system wiring pre/post 3/09 https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_ Base System Guide http://www.e90post.com/forums/attach...5&d=1493273253 Last edited by ctuna; 12-02-2022 at 12:52 PM.. |
| 12-02-2022, 12:52 PM | #3 |
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I have a little secret... It's a 2011 128i, not a 3 series. I'm here because the 1 series forum hasn't turned up any results  My 128 and a similarity equipped 328 should have the same radio. |
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| 12-02-2022, 02:01 PM | #5 | ||
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Quote:
Quote:
Now any idea where I can find a diagram? I just need to know where to tap my line out from. Would it be possible to trace the wires from the under seat speakers using a multi meter? |
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| 12-02-2022, 05:20 PM | #6 |
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There are only 4 channels coming out of the Head Unit.
You must understand that the Front Floors and Door speakers are wired in parallel. So Front Channels meet at the 4 wire connector at the speaker under the seat. The closest thing you will get to a wiring diagram for the base system is the Alpine Retrofit Pdf. It talks about the wire coloring some where when it describes spitting the connection for the front doors and floors. Adding a sub or another amp will still get you a crappy system. subwoofer threads http://www.e90post.com/forums/showpo...2&postcount=66 http://www.e90post.com/forums/showth...t=Ultimate+Sub http://www.e90post.com/forums/showth...ight=subwoofer Last edited by ctuna; 12-02-2022 at 05:32 PM.. |
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| 12-02-2022, 06:55 PM | #7 | |
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Let me make sure I understand what you're saying: 1) Since the under seat speakers and door speakers are in parallel, they have same signal 2) the best way I can tie those signals into my LOC is to simply tap into the wires from the left and right under seat speakers. Here's one thing I'm a little confused on, when you say "front Channels meet at the 4 wire connector at the speaker under the seat", do you mean that the wires for the front left and front right speakers are in the same four wire harness under a single seat? Or do I need to tap into the right seat speaker for the right channel, and the left under seat speaker for the left? |
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| 12-02-2022, 09:59 PM | #8 |
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Most all car stereo's have a front and right and left stereo channel as well
as Rear right and left rear channel the base stereo and Hi Fi are no different. The head unit channels come in on the 4 pin connector on 2 pins and the other 2 pins carry it back to the doors. The door and floor speakers are wired in parallel in the base system. A line converter should not load down these Front channels if it has a high enough immpedence. The method mentioned in the sub woofer thread is a known to work solution. If you are going to add better amp and speakers in the stock locations the under seat location connector is the place to intercept the signal for the Front Speakers run it to and amp then back to whatever you have put in . The head unit as it comes from the factory barely has enough power to run the stock speakers. There is a description about this in the links. If you really want good sound you will need to do something similar to what is described in the base audio guide. (supplied) http://www.e90post.com/forums/attach...2&d=1266451970 http://www.e90post.com/forums/showthread.php?t=352586 Last edited by ctuna; 12-02-2022 at 10:22 PM.. |
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