Bluetooth intermittent

Denny347 · 09-13-2020, 06:06 PM

I've owned my car for about a year and had never had a bluetooth issue. Recently, I connect a call and after 2 minutes, disconnects the car and reconnects back to the car. It will keep switching from car to phone until I turn off the phone bluetooth. It's my same Goggle Pixel (original XL) with no updates since Nov of last year. I have Idrive and Ipod integration. I've disconnected my battery for an hour or so and problem still persists. I have a MULF2 module as well as my TCU. Which one would I need to replace for intermittent bluetooth connection? From what I have gathered thus far, typically, the TCU handles the bluetooth function but since I have a MULF2 module, it handles that and the TCU is pretty much only for BMW assist. Is that actually correct?

Denny347 · 09-19-2020, 07:21 AM

Welp, I replaced the TCU with a used unit from Ebay and same problem. On to buying a used MULF2 unit. I will say that having the Protool is AWESOME!!!. Updating the VIN on the new TCU took 2 minutes. Half temped to just update the CCC with a CIC/Combox code it myself.

alfazrus · 09-20-2020, 11:00 PM

Can you tell us in more detail how did you update vin on the new tcu with protool. I had a problem with mine, now I'm using the optical bypass adaptor but, would like to get a module and code it.

09-13-2020, 06:06 PM	#1
Denny347 Major 360 Rep 1,080 Posts Drives: 2008 M3 E90 Join Date: Aug 2010 Location: Indianapolis, IN iTrader: (0)	Bluetooth intermittent I've owned my car for about a year and had never had a bluetooth issue. Recently, I connect a call and after 2 minutes, disconnects the car and reconnects back to the car. It will keep switching from car to phone until I turn off the phone bluetooth. It's my same Goggle Pixel (original XL) with no updates since Nov of last year. I have Idrive and Ipod integration. I've disconnected my battery for an hour or so and problem still persists. I have a MULF2 module as well as my TCU. Which one would I need to replace for intermittent bluetooth connection? From what I have gathered thus far, typically, the TCU handles the bluetooth function but since I have a MULF2 module, it handles that and the TCU is pretty much only for BMW assist. Is that actually correct?
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09-19-2020, 07:21 AM	#2
Denny347 Major 360 Rep 1,080 Posts Drives: 2008 M3 E90 Join Date: Aug 2010 Location: Indianapolis, IN iTrader: (0)	Welp, I replaced the TCU with a used unit from Ebay and same problem. On to buying a used MULF2 unit. I will say that having the Protool is AWESOME!!!. Updating the VIN on the new TCU took 2 minutes. Half temped to just update the CCC with a CIC/Combox code it myself.
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09-20-2020, 11:00 PM	#3
alfazrus First Lieutenant 101 Rep 309 Posts Drives: 2006 e90 330i Join Date: Oct 2012 Location: DC iTrader: (2)	Can you tell us in more detail how did you update vin on the new tcu with protool. I had a problem with mine, now I'm using the optical bypass adaptor but, would like to get a module and code it. Last edited by alfazrus; 09-21-2020 at 09:25 AM..
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