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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > MOST Bus Fiber optic question



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      08-06-2012, 02:46 AM   #1
njw1967
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MOST Bus Fiber optic question

Guys
I know this subject has come up a few times on the forum but i don't seem to be able to find a easy guide to setting up the MOST bus fiber optic cables on my E92.

I have fitted the CDC and had the head unit coded it now displays the CDC icon i just need to sort out the fiber optic connection?????.

MY car does have Bluetooth but does not have Sat Nav i have located the connectors under the rear seat bolster and the top connector block has two cables in it and the bottom one only has 4 i have the BMW instruction sheets but its is not translated very clearly. and it shows 6 cables in the bottom block ??

Is it simply a case of moving the existing top two cables over one place and putting the top cable from the top block into number one pin and then putting the bottom cable from the top block into the end of the bottom block.??

Better still does any one have a diagram of the proper pin outs??

Any Help would be appreciated

Best Regards Neil
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      08-06-2012, 04:35 AM   #2
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The MOST bus is a ring. The bottom block is the 'live' ring and the top one is stuff that's not in the ring. You'll currently have something like this:

head unit -> bottom block -> MULF -> bottom block -> head unit

What you need to do is insert your new device at the end of the ring, before the feed back to the head unit, like so:

head unit -> bottom block -> MULF -> bottom block -> CD changer -> bottom block -> head unit

Supposing you currently have cables in the bottom block in positions 1, 2, 3 and 4 - you'd need to move 4 to 6, then move the cables from the top block into 4 and 5, keeping them in order. Does that make sense? Probably best to label everything before you start so you can put it back how it was before if necessary
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      08-06-2012, 08:01 AM   #3
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Hi Seanblee firstly many thanks for your help
Here are my blocks I have labeled them top and bottom can any one tell me the numbers i need to move and to where?
Also another question is are the fiber optic leads polarized so they will only fit into the top and the bottom of the blocks respectively.

The orientation as they are in the photo is correct with the convoluted cable on the top side


Thanks in advance Neil



Last edited by njw1967; 08-06-2012 at 08:19 AM.
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      08-06-2012, 09:00 AM   #4
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Ah, that's confusing - same numbers on both sides. OK:

Move BOTTOM UPPER 2 to BOTTOM UPPER 3
Move TOP UPPER 2 to BOTTOM UPPER 2
Move TOP LOWER 2 to BOTTOM LOWER 3

where TOP/BOTTOM is the block and UPPER/LOWER is the side of the block. If that doesn't work, you may need to swap BOTTOM UPPER 2 and BOTTOM LOWER 3 (i.e. the two new fibres you've added to the ring). I don't believe they are polarised.

Edit: Here's a picture in case that didn't make sense!
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Last edited by seanblee; 08-06-2012 at 09:22 AM.
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      08-06-2012, 10:00 AM   #5
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Many Thanks for your help i will give that a try tonight after work and report back in the morning

Regards Neil
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      08-07-2012, 10:33 AM   #6
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Thank you for your help seanblee "its was music to my ears" its all working great and the Bluetooth i owe you a pint

Best Regards Neil
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      08-07-2012, 11:41 AM   #7
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Great news Neil, glad it's all working for you!

Sean
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      02-13-2013, 07:27 AM   #8
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MOST loop

Is it possible to just add the device behind the radio and attach it there to the MOST ring, so the loop continues? So incoming light -> USB device -> outgoing light -> Head unit
Im asking this because I want the USB in my glove box.
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      07-03-2013, 06:56 PM   #9
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Need help here...Installed used Sirius tuner, had BadMoFo coded in then moved fiber lines in place. SAT is not showing up. Not getting any MOST errors, Bluetooth, radio and SOS all working fine. I am pretty sure fiber lines are correct as I do get light coming through from SDAR line. Is it possible coding did not stick since fiber lines were not in place yet?
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      12-13-2013, 10:43 AM   #10
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trying to add a MULF and looking to find these blocks in my e92. Can you provide some specific detail on where exactly it is located. I removed the bottom seat cushion on the divers side and dont see anything.
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      12-13-2013, 11:45 AM   #11
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It's on the side, not the bottom - you need to pull out the side part of the backrest. Pull from the top, then lift when the top is unclipped.
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