Bluetooth mic not working after MULF2 HIGH install (SOLVED)

F31B48 · 05-16-2021, 12:41 AM

Hi Guys,

I have an issue with my Bluetooth mic not working after installing MULF2 HIGH SVS

Car came with option 640. Changed this to 644 and did fa write to cas and frm, then coded them and cappl (i have ccc) after installing mulf2 high unit. Everything works but nobody can hear me when making calls.

Car is 0307. Things i have tried.

Swapped the mic with another unit
Swapped the MULF2 high unit into another car and the mic worked fine
Tried changing coding for mic from analog to MOST
Triple checked wiring
Triple checked coding and vo

Anybody have this issue before, or have any suggestions on how to resolve this?

F31B48 · 05-16-2021, 02:25 AM

I think i may have found the issue. Scanned the car with ISTA and it thinks there's a MOST ring break and also thinks it has a ULF and MULF2. (Screenshot below)
I think i need to add +ULF2 to the vo as well. Will update when I've tried that.

F31B48 · 05-28-2021, 11:25 PM

Just finished solving this issue. There were two problems actually.

The fix for the car thinking it had 2 phone modules was adding +ULF2 and 6FL to the vehicle order.

The second issue with the mic not working turned out to be an incorrectly pinned wiring connector on the RH A pillar, which the factory microphone wiring runs through. It is a white 10 pin connector. One side of the connector was correct. But the otherside had the mic wires in pin slots 5, 6 and 7 instead of 1, 2 and 3 as per the wiring diagram. Swapped the wires into the correct slots and everything is now working. The pic below is where the connector is located. Hope this can help someone in future.

05-16-2021, 12:41 AM	#1
F31B48 Captain 278 Rep 657 Posts Drives: BMW G21 E61 LCI Join Date: Feb 2019 Location: Australia iTrader: (0)	Bluetooth mic not working after MULF2 HIGH install (SOLVED) Hi Guys, I have an issue with my Bluetooth mic not working after installing MULF2 HIGH SVS Car came with option 640. Changed this to 644 and did fa write to cas and frm, then coded them and cappl (i have ccc) after installing mulf2 high unit. Everything works but nobody can hear me when making calls. Car is 0307. Things i have tried. Swapped the mic with another unit Swapped the MULF2 high unit into another car and the mic worked fine Tried changing coding for mic from analog to MOST Triple checked wiring Triple checked coding and vo Anybody have this issue before, or have any suggestions on how to resolve this? Last edited by F31B48; 05-28-2021 at 11:12 PM..
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05-16-2021, 02:25 AM	#2
F31B48 Captain 278 Rep 657 Posts Drives: BMW G21 E61 LCI Join Date: Feb 2019 Location: Australia iTrader: (0)	I think i may have found the issue. Scanned the car with ISTA and it thinks there's a MOST ring break and also thinks it has a ULF and MULF2. (Screenshot below) I think i need to add +ULF2 to the vo as well. Will update when I've tried that. Attached Images
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05-28-2021, 11:25 PM	#3
F31B48 Captain 278 Rep 657 Posts Drives: BMW G21 E61 LCI Join Date: Feb 2019 Location: Australia iTrader: (0)	Just finished solving this issue. There were two problems actually. The fix for the car thinking it had 2 phone modules was adding +ULF2 and 6FL to the vehicle order. The second issue with the mic not working turned out to be an incorrectly pinned wiring connector on the RH A pillar, which the factory microphone wiring runs through. It is a white 10 pin connector. One side of the connector was correct. But the otherside had the mic wires in pin slots 5, 6 and 7 instead of 1, 2 and 3 as per the wiring diagram. Swapped the wires into the correct slots and everything is now working. The pic below is where the connector is located. Hope this can help someone in future. Attached Images
	Appreciate 0 Quote