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Thread: 98 740il rear speaker wiring color

  1. #1
    Join Date
    May 2016
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    1998 e38 740il

    98 740il rear speaker wiring color

    Just wondering if anyone knows or remembers off the top of their head the wire colors for the rear speakers in a 98 740iL. I recently installed an aftermarket Android head units along with an Alpine PDX 4ch amp, ditching the stock DSP completely.
    I have the amp powering the front speakers now, bridged, but wanted to run the rear speakers off the head unit just for fill. I can't verify for sure which wiring color for the rear speakers are. I know for sure the cables with brown stripes are usually the (-) side, but not sure for the (+) wires going to the HU for power. Any info or confirmation is appreciated.

  2. #2
    Join Date
    Feb 2013
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    The Motor City
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    1997 750 IL
    The 740 setup is just a stereo signal to the DSP amp then then AMP sends out all the channels. I don't think there are any speaker lines going to the head unit plug.
    ---- Processing Individual ----
    Z1XX Upholstery
    Seats front and back in Epingle / leather englishgruen,
    As Schl.Nr. B9EG.
    Front seat backrest in Montana Englishgruen (No. 8 174 861)
    Other interior equipment as for Volleder Nappa englischgruen,
    Schl.Nr. P5EG

  3. #3
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    May 2016
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    1998 e38 740il
    Thanks xboss. So for the Android unit that I got, the HU is internally powered with 4x50W. I'm using the 17-pin plug from the radio in the trunk to the HU harness. Do you know which wires (pins) on the either harness the rear wires can tap in to get that power?
    Last edited by Greygoose82; 05-02-2017 at 05:46 PM.

  4. #4
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    1997 750 IL
    I might be confusing myself. I thought the 4x50Watt outputs were the rca jacks that come off the other plug on the back of android units and the 17 pin is just a stereo signal but I may be wrong, I found some pinout stuff earlier. I will see if I can find it.
    Last edited by xboss; 05-03-2017 at 02:44 AM.
    ---- Processing Individual ----
    Z1XX Upholstery
    Seats front and back in Epingle / leather englishgruen,
    As Schl.Nr. B9EG.
    Front seat backrest in Montana Englishgruen (No. 8 174 861)
    Other interior equipment as for Volleder Nappa englischgruen,
    Schl.Nr. P5EG

  5. #5
    Join Date
    Dec 2006
    Location
    San Jose, CA
    Posts
    1,272
    My Cars
    00 750IL, 01 740IL
    Quote Originally Posted by Greygoose82 View Post
    Just wondering if anyone knows or remembers off the top of their head the wire colors for the rear speakers in a 98 740iL. I recently installed an aftermarket Android head units along with an Alpine PDX 4ch amp, ditching the stock DSP completely.
    I have the amp powering the front speakers now, bridged, but wanted to run the rear speakers off the head unit just for fill. I can't verify for sure which wiring color for the rear speakers are. I know for sure the cables with brown stripes are usually the (-) side, but not sure for the (+) wires going to the HU for power. Any info or confirmation is appreciated.
    Left rear tweeter + yellow/black
    Left rear tweeter - yellow/gray

    Left rear mid woofer + yellow/violet
    Left rear mid woofer - yellow/gray


    Right rear tweeter + blue/black
    Right rear tweeter - blue/gray

    Right rear mid woofer + blue/violet
    Right rear mid woofer - blue/gray

    You're welcome!

  6. #6
    Join Date
    May 2016
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    Louisiana
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    1998 e38 740il
    Why thank you mr. asianvenom! I did see these wires and had separated them out. Just wasn't sure if they were coming from the dsp amp side or going to the rear speakers side. Will double check to make sure.

  7. #7
    Join Date
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    00 750IL, 01 740IL
    I'm positive its going to the speakers, I just recently wired my whole system.

    Instead bridging the rear in with the front, use your deck speakers output and run the rear mids only. Use the original wires that carries the original audio to the dsp amp tap that into the rear mids in the trunk. If you look behind your deck you should see 2 pairs of speaker wires, those speaker wires runs to the trunk.

  8. #8
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    Ok so the wires you identified earlier goes directly to the rear speakers. I still need to identify the wires carrying power from the aftermarket HU to tap them in to. The aftermarket harness plugs into the oem 17-pin plug from the old radio. I just need to decide which wires to tap in from there. (If I'm understanding you correctly)

  9. #9
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    00 750IL, 01 740IL
    There should be just 2 pair of twisted pair in the dash

  10. #10
    Join Date
    May 2016
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    Louisiana
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    1998 e38 740il
    Found the head unit speaker wires finally! Soldered in the yellow/violet and blue/violet pairs and bam! got the rears playing. Life without DSP is so much better. Thanks for the info!

  11. #11
    Join Date
    Aug 2020
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    Miami
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    Bmw 750iL
    Hello. Guys, does anyone know what color the front door speaker wires are in the trunk ?

    - - - Updated - - -

    Hello. Do you know the colors for the front speakers in e38? Thank u

  12. #12
    Join Date
    Apr 2021
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    Simsbury, CT 06089 USA
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    1998 BMW 740IL
    Quote Originally Posted by Antonivanov View Post
    Hello. Guys, does anyone know what color the front door speaker wires are in the trunk ?

    - - - Updated - - -

    Hello. Do you know the colors for the front speakers in e38? Thank u
    I have the same problem left front speakers not working BMW 740IL 1998 with DSP any wiring help?

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