MULF Unit Failure

dorkbydesign · 10-09-2013, 03:35 AM

Hey all!

My MULF2 unit is dead so until I have enough money to replace it, I was wondering if I can just bypass it in the MOST loop so that all my AUX and stuff works?

If so, how would I go about doing this?

Thanks!
x.dorky!

Fooljam · 10-09-2013, 03:44 AM

Disconnect the fibre optic plug that goes into it, unclip the 2 heads and join them together.

dorkbydesign · 10-09-2013, 05:23 AM

Hi,

Sorry I'm not too sure what you mean. I understand that the smaller black plug is the MOST port but what two heads?

ctuna · 10-09-2013, 01:04 PM

There is a Most Junction Box/ Hub behind the rear seat bolster
on the US Drivers side. You can reroute there or just buy
a Most jumper and put it right at the Mulf. That will at least close the Most Loop I don't know if the faulty module will throw error messages .

There are some DIY's that show this junction box in the DIY section
for things like adding the ipod or cd changer .

You might be a to kludge a cheap most jumper together with something like a straw and some duck or electrical tape. Find a small tube that just fits over the fiberoptics end piece stick the fiberoptic from input and output of the mulf in the tube tape in place.

http://www.e90post.com/forums/showth...ght=cd+changer

The above shows the junction box.

Fooljam · 10-09-2013, 02:40 PM

Quote:

Originally Posted by dorkbydesign

Hi,

Sorry I'm not too sure what you mean. I understand that the smaller black plug is the MOST port but what two heads?

My bad that was a quick response...

I use part number 4 below when I come across this kind of issues in customers cars, and hell those issues are too common.

Remove the MOsT plug from the BT module, unclip those 2 green wires and join them in the part 4 (BMW part number 61136906535) from the picture (Or similar)

Or use the suggestion made by CTUNA. It is good too, but personally I have lots of spare part 4 and I don't bother as it can be tricky to unclip this "junction" box for the Most connectors.

dorkbydesign · 10-09-2013, 07:12 PM

Quote:

Originally Posted by Fooljam

My bad that was a quick response...

I use part number 4 below when I come across this kind of issues in customers cars, and hell those issues are too common.

Where can I find part number 4?

Fooljam · 10-10-2013, 04:08 AM

Quote:

Originally Posted by dorkbydesign

Where can I find part number 4?

Told you in the previous post, (BMW part number 61136906535), from the dealer, possibly eBay too.

dorkbydesign · 10-17-2013, 08:40 AM

Quote:

Originally Posted by Fooljam

Anyone have any idea how to unclip the two heads from here?

wintersm · 05-29-2018, 10:37 AM

I successfully bypassed my MULF Unit (underneath the TCU unit) in the trunk of my 2009 e93 (328i convertible). I purchased the recommended fiber optic jumper cable, modified it as directed on various forums, and secured it to the MULF fiber optic connector.

As a result of the bypass, I've lost AUX input (under the center arm rest).

I don't think I have lost any other functionality that I desperately need, but I would really like to connect my phone to my car speakers (likely via AUX cable).

It seems like it may be possible to connect an AUX cable to the head unit?

By the way, I have nav/iDrive.

Thanks for any ideas or guidance on recovering AUX functionality without replacing my faulty MULF unit.

-Mike

ptpending · 05-29-2018, 03:51 PM

Quote:

Originally Posted by wintersm

I successfully bypassed my MULF Unit (underneath the TCU unit) in the trunk of my 2009 e93 (328i convertible). I purchased the recommended fiber optic jumper cable, modified it as directed on various forums, and secured it to the MULF fiber optic connector.

As a result of the bypass, I've lost AUX input (under the center arm rest).

I don't think I have lost any other functionality that I desperately need, but I would really like to connect my phone to my car speakers (likely via AUX cable).

It seems like it may be possible to connect an AUX cable to the head unit?

By the way, I have nav/iDrive.

Thanks for any ideas or guidance on recovering AUX functionality without replacing my faulty MULF unit.

-Mike

you need to get or make aux cable to headunit and connect aux socket to that cable and headunit and recode headunit
another option - you can buy MULF2 unit pre-coded to you options list, from qualified electirc, simply replace failed and everything should work

irving102 · 06-07-2018, 10:44 PM

Quote:

Originally Posted by ptpending

you need to get or make aux cable to headunit and connect aux socket to that cable and headunit and recode headunit
another option - you can buy MULF2 unit pre-coded to you options list, from qualified electirc, simply replace failed and everything should work

where do you look for the mulf2 precoded?

ctuna · 06-08-2018, 05:44 AM

both aux and usb come from the mulf in a lot of cars.

Blue tab on Fiberoptic connector is the locking pin see video.

ptpending · 06-08-2018, 08:40 AM

Quote:

Originally Posted by irving102

where do you look for the mulf2 precoded?

i can sell precoded MULF2HIGH unit to you

10-09-2013, 03:35 AM	#1
dorkbydesign Enlisted Member 10 Rep 46 Posts Drives: 2007 320i Join Date: Jul 2013 Location: Sydney, Australia iTrader: (0)	MULF Unit Failure Hey all! My MULF2 unit is dead so until I have enough money to replace it, I was wondering if I can just bypass it in the MOST loop so that all my AUX and stuff works? If so, how would I go about doing this? Thanks! x.dorky!
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10-09-2013, 03:44 AM	#2
Fooljam Private First Class 13 Rep 121 Posts Drives: 5 series Join Date: Mar 2009 Location: Everywhere iTrader: (0)	Disconnect the fibre optic plug that goes into it, unclip the 2 heads and join them together.
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10-09-2013, 05:23 AM	#3
dorkbydesign Enlisted Member 10 Rep 46 Posts Drives: 2007 320i Join Date: Jul 2013 Location: Sydney, Australia iTrader: (0)	Hi, Sorry I'm not too sure what you mean. I understand that the smaller black plug is the MOST port but what two heads?
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10-09-2013, 01:04 PM	#4
ctuna Lieutenant General 2045 Rep 13,358 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	There is a Most Junction Box There is a Most Junction Box/ Hub behind the rear seat bolster on the US Drivers side. You can reroute there or just buy a Most jumper and put it right at the Mulf. That will at least close the Most Loop I don't know if the faulty module will throw error messages . There are some DIY's that show this junction box in the DIY section for things like adding the ipod or cd changer . You might be a to kludge a cheap most jumper together with something like a straw and some duck or electrical tape. Find a small tube that just fits over the fiberoptics end piece stick the fiberoptic from input and output of the mulf in the tube tape in place. http://www.e90post.com/forums/showth...ght=cd+changer The above shows the junction box. Last edited by ctuna; 10-09-2013 at 01:36 PM..
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05-29-2018, 10:37 AM	#9
wintersm Registered 0 Rep 1 Posts Drives: 2009 328i convertible (e93) Join Date: May 2018 Location: Indian Harbour Beach, FL iTrader: (0)	MULF Bypass caused AUX failure I successfully bypassed my MULF Unit (underneath the TCU unit) in the trunk of my 2009 e93 (328i convertible). I purchased the recommended fiber optic jumper cable, modified it as directed on various forums, and secured it to the MULF fiber optic connector. As a result of the bypass, I've lost AUX input (under the center arm rest). I don't think I have lost any other functionality that I desperately need, but I would really like to connect my phone to my car speakers (likely via AUX cable). It seems like it may be possible to connect an AUX cable to the head unit? By the way, I have nav/iDrive. Thanks for any ideas or guidance on recovering AUX functionality without replacing my faulty MULF unit. -Mike
	Appreciate 0 Quote

06-08-2018, 05:44 AM	#12
ctuna Lieutenant General 2045 Rep 13,358 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	both aux and usb come from the mulf in a lot of cars. Blue tab on Fiberoptic connector is the locking pin see video. Last edited by ctuna; 06-08-2018 at 05:51 AM..
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