MOST Fiber bundle connector in door

Djetaine · 08-26-2019, 08:52 PM

Does anyone know how to disassamble this connector?
I'm trying to diagnose a MOST loop break and as far as I know, this is the last connection before it goes to the diag port under the dash. I need to get it apart and see if there is light passing through.

mapster37 · 08-26-2019, 09:12 PM

thats probably the last one i would be messing with, its just a junction of all most cables, so unless you know which fiber optic cable is which. i think its easier to go to each individual module one at a time....

Djetaine · 08-26-2019, 09:40 PM

Quote:

Originally Posted by mapster37

thats probably the last one i would be messing with, its just a junction of all most cables, so unless you know which fiber optic cable is which. i think its easier to go to each individual module one at a time....

I have checked each module (at least all the modules I know of in the loop)
As far as I can tell it goes:
HeadUnit > Amp > TCU > SAT > HD Tuner > Junction > Diag > Head Unit

I have tested all of those except the headunit as I can't really get to it easily.
I do know which cable since they are labeled. I know that the return cable coming from the HD Tuner is labeled 293 and is on pin 5 of that junction.

Djetaine · 08-27-2019, 09:09 AM

Well, I got it apart this morning and there is indeed light passing through the 293 cable so it's somewhere after the junction.
I don't know the exact path it goes after that though. looks like I have some dismantling to do.

Scrippy · 08-27-2019, 02:58 PM

Each connector has a TX & RX. The junction you found is where this happens. The TX of one module goes to RX of the next thus creating a comm loop. That being said you could remove one at a time and place a flashlight at one end and through testing each one you can find the issue by seeing the light and ruling out a wire at a time. Also there is a plug under the steering column. It's for hooking an icom to talk to car. The plug looks like a flat square and when you pull it down you will see a termination loop. Maybe that term loop is not plugged in correctly creating an open.

08-26-2019, 08:52 PM	#1
Djetaine Private 31 Rep 62 Posts Drives: 01 330ci, 08 e93m3 Join Date: Jul 2018 Location: Texas iTrader: (0)	MOST Fiber bundle connector in door - how to get open? Does anyone know how to disassamble this connector? I'm trying to diagnose a MOST loop break and as far as I know, this is the last connection before it goes to the diag port under the dash. I need to get it apart and see if there is light passing through. Attached Images
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08-26-2019, 09:12 PM	#2
mapster37 Captain 362 Rep 923 Posts Drives: F80 Join Date: Sep 2018 Location: Davie iTrader: (2)	thats probably the last one i would be messing with, its just a junction of all most cables, so unless you know which fiber optic cable is which. i think its easier to go to each individual module one at a time....
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08-27-2019, 09:09 AM	#4
Djetaine Private 31 Rep 62 Posts Drives: 01 330ci, 08 e93m3 Join Date: Jul 2018 Location: Texas iTrader: (0)	Well, I got it apart this morning and there is indeed light passing through the 293 cable so it's somewhere after the junction. I don't know the exact path it goes after that though. looks like I have some dismantling to do.
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08-27-2019, 02:58 PM	#5
Scrippy Lord Scrip 1812 Rep 3,013 Posts Drives: 2011 M3 Coupe Join Date: Jan 2012 Location: LA,Ca iTrader: (0) Garage List [0.00] 2007 BMW 335i [0.00]	Each connector has a TX & RX. The junction you found is where this happens. The TX of one module goes to RX of the next thus creating a comm loop. That being said you could remove one at a time and place a flashlight at one end and through testing each one you can find the issue by seeing the light and ruling out a wire at a time. Also there is a plug under the steering column. It's for hooking an icom to talk to car. The plug looks like a flat square and when you pull it down you will see a termination loop. Maybe that term loop is not plugged in correctly creating an open. __________________
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