Retrofitted CIC has low quality phone calls

Luper52 · 07-20-2021, 01:55 AM

Hi all,

I retrofitted CIC and combox to my 07 E90. I have coded it and have been enjoying Bluetooth Audio streaming for a few months now—definitely a necessary upgrade.

However, while music streams fine (and in high quality) my phone calls have static whenever audio is being received during the call. Akin to the same static you'd hear if a radio was barely picking up the station. I have tried both the stock Bluetooth antenna as well as an Amazon Bluetooth antenna, so I know it's not that. All functions of the combox work perfectly, including Apps. Spotify is crystal clear.

Anyone know what the problem might be? Is this common for CIC phone calls? Surely not.

GtiGyver · 07-21-2021, 04:05 PM

Microphone maybe?
Bad ground

Luper52 · 07-21-2021, 04:11 PM

Quote:

Originally Posted by GtiGyver

Microphone maybe?
Bad ground

I mean on their end when the audio comes through it crackles. Is receiving phone audio also connected to the microphone ground?

07-20-2021, 01:55 AM	#1
Luper52 Second Lieutenant 59 Rep 217 Posts Drives: 2007 BMW 335i E90 Join Date: Sep 2019 Location: Birmingham, AL iTrader: (0) Garage List 2007 BMW 335i [10.00]	Retrofitted CIC has low quality phone calls Hi all, I retrofitted CIC and combox to my 07 E90. I have coded it and have been enjoying Bluetooth Audio streaming for a few months now—definitely a necessary upgrade. However, while music streams fine (and in high quality) my phone calls have static whenever audio is being received during the call. Akin to the same static you'd hear if a radio was barely picking up the station. I have tried both the stock Bluetooth antenna as well as an Amazon Bluetooth antenna, so I know it's not that. All functions of the combox work perfectly, including Apps. Spotify is crystal clear. Anyone know what the problem might be? Is this common for CIC phone calls? Surely not. __________________ If you found my post helpful, please consider hitting the 'Appreciate' button Instagram - YouTube
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07-21-2021, 04:05 PM	#2
GtiGyver Lieutenant 69 Rep 460 Posts Drives: 2009 Space Grey E90 328i MT Join Date: Jun 2009 Location: Montreal iTrader: (3)	Microphone maybe? Bad ground
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