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08-26-2019, 08:52 PM | #1 |
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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. |
08-26-2019, 09:12 PM | #2 |
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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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08-26-2019, 09:40 PM | #3 | |
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Quote:
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. |
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08-27-2019, 09:09 AM | #4 |
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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 |
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Drives: 2011 M3 Coupe
Join Date: Jan 2012
Location: LA,Ca
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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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