Power Supply to Audio Harness

DEE-83 · 12-30-2017, 06:02 PM

Hi All,

In need of some advice / assistance please, I have no power supply from the audio harness.

Before i changed the head unit, I noticed a red light glowing on the harness.

Looking at it now, there is no light and my new head unit is not powering up.

Could I have blown a fuse/s on the car/harness side)

Any help at all would be amazing.

ctuna · 12-30-2017, 06:09 PM

DEE-83 · 12-30-2017, 06:18 PM

Quote:

Originally Posted by ctuna

Thanks for the reply, I have a Base audio system and just to confirm I didn't hack into the wiring I used a harness.

This is my second head unit install, first one went without a problem and this one was working ok, suddenly I am not getting any power to the head unit.

I’m really hoping it’s just a fuse

ctuna · 12-30-2017, 06:24 PM

What are you putting in ? The red light you saw may be from the disconnected most bus fiber optic line. There is a Head Unit pinout in one of the first head unit links. There is a fuse for the radio you might check that.

Suggest you check for most bus modules by doing a vin check and looking
at the options listed.

https://www.newtis.info/tisv2/a/en/

the above is good for pinouts and chasing fuse
positions down.

Year model and options would be needed for an
intelligent response.

Most of the aftermarket harness don't let the most bus shine through. No aftermarket head unit has a most bus connection so it doesn't matter anyway.
(well at least last time I checked)

DEE-83 · 12-30-2017, 06:54 PM

Quote:

Originally Posted by ctuna

What are you putting in ? The red light you saw may be from the disconnected most bus fiber optic line. There is a Head Unit pinout in one of the first head unit links. There is a fuse for the radio you might check that.

Suggest you check for most bus modules by doing a vin check and looking
at the options listed.

https://www.newtis.info/tisv2/a/en/

the above is good for pinouts and chasing fuse
positions down.

Year model and options would be needed for an
intelligent response.

Most of the aftermarket harness don't let the most bus shine through. No aftermarket head unit has a most bus connection so it doesn't matter anyway.
(well at least last time I checked)

Thanks again, I was installing a Pioneer SPH-DA230, everything was working fine until I unplugged it.

Unfortunalty I can find any free VIN finders online so i will have to dig out my V5 to check.

With regards to the most bus light, this was glowing before, I plugged it in, when i removed it again it's wasn't shining.

Hence my thought that it may be a blown fuse.

ctuna · 12-30-2017, 08:27 PM

https://www.bmwvin.com/

https://vindecoder.eu/bmw

bluetooth , SOS , usb , Sat and I think DAB modules
all run off most Bus.

You can look up fuse number on the tis site
there should be fuse chart behind the glove box
in all the 3's at least.

DEE-83 · 12-31-2017, 12:20 PM

Quote:

Originally Posted by ctuna

https://www.bmwvin.com/

https://vindecoder.eu/bmw

bluetooth , SOS , usb , Sat and I think DAB modules
all run off most Bus.

You can look up fuse number on the tis site
there should be fuse chart behind the glove box
in all the 3's at least.

Thanks for your help, I went got some fuses and a circuit checker. All working now.

12-30-2017, 06:02 PM	#1
DEE-83 Private 4 Rep 97 Posts Drives: BMW E93 Join Date: Apr 2016 Location: London iTrader: (2)	Power Supply to Audio Harness Hi All, In need of some advice / assistance please, I have no power supply from the audio harness. Before i changed the head unit, I noticed a red light glowing on the harness. Looking at it now, there is no light and my new head unit is not powering up. Could I have blown a fuse/s on the car/harness side) Any help at all would be amazing.
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12-30-2017, 06:09 PM	#2
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	First you must identify which of the the three common BMW sound systems you have this has nothing to do with which Head unit or Idrive you have. There is a sticky at the top of the forum page called Wiring diagrams for members. 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.bmwmotorsports.org/pdf/e7...%20Systems.pdf http://www.e90post.com/forums/showthread.php?t=343673 http://www.e90post.com/forums/showthread.php?t=138949 http://www.e90post.com/forums/attach...1&d=1209780605 http://www.e90post.com/forums/attach...1&d=1209780865 http://www.e90post.com/forums/showthread.php?t=641323 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.bmwmotorsports.org/BMW_docs/mostbus.pdf http://www.e90post.com/forums/attach...4&d=1278871872 If you are trying to put and aftermarket HU into your car you should have done a lot of research before attempting it. If you have a Logic 7 amp or options hanging of the the Most Bus you might have some big problems. head unit http://www.e90post.com/forums/showth...ight=head+unit http://www.e90post.com/forums/showthread.php?t=1036190 http://www.e90post.com/forums/showth...hlight=dynavin http://www.janus-design.net/english/ http://www.e90post.com/forums/showthread.php?t=355089 http://www.e90post.com/forums/showth...ight=head+unit http://www.e90post.com/forums/showth...hlight=dynavin http://www.e90post.com/forums/showth...hlight=dynavin http://www.e90post.com/forums/showth...light=retrofit http://www.e90post.com/forums/showthread.php?t=993447 http://www.e90post.com/forums/showthread.php?t=1016187 https://www.bmwgm5.com/Logic7_E90_91_92_93.htm http://www.e90post.com/forums/showth...hlight=dynavin Also I hope you used a harness and did not hack into the wiring.
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12-30-2017, 06:24 PM	#4
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	What are you putting in ? The red light you saw may be from the disconnected most bus fiber optic line. There is a Head Unit pinout in one of the first head unit links. There is a fuse for the radio you might check that. Suggest you check for most bus modules by doing a vin check and looking at the options listed. https://www.newtis.info/tisv2/a/en/ the above is good for pinouts and chasing fuse positions down. Year model and options would be needed for an intelligent response. Most of the aftermarket harness don't let the most bus shine through. No aftermarket head unit has a most bus connection so it doesn't matter anyway. (well at least last time I checked) Last edited by ctuna; 12-30-2017 at 06:30 PM..
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12-30-2017, 08:27 PM	#6
ctuna Lieutenant General 2045 Rep 13,364 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	https://www.bmwvin.com/ https://vindecoder.eu/bmw bluetooth , SOS , usb , Sat and I think DAB modules all run off most Bus. You can look up fuse number on the tis site there should be fuse chart behind the glove box in all the 3's at least.
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