E92 Master window switch block not working. tried everything

ali2109 · 04-02-2023, 11:01 PM

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Hi i have an e92 325d. the master window switch is not working since i bought the car, i have replaced all of the fuses, checked them to no avail. I bought a new switch for the master switch which did not work, I bought a new FRM module which also did not work. I also replaced the wiring in the drivers door and inspected the plug at the A pillar which all seemed fine. what confuses me the most is that the fob will roll the window down but not from the master switch, the mirror adjustments do not work although i have randomly seen the mirrors move on their own from time to time. I have tried disconnecting both mirrors with no luck, i have all of the BMW coding tools and the errors that appear for me are 9CBA: Communication with LIN operator unit disturbed and 9CC3: communication with mirror, drivers side disturbed. when messing around with it, sometimes another error code appears which is communication with mirror, passenger side disturbed. I have been trying to diagnose this for months and have seen many other posts about this issue but none of the fixes have worked, ANY help would be much much appreciated. I was told George on the general board is good at diagnosing these kind of problems.

Redd · 04-04-2023, 06:11 PM

Man that sounds like a tough one. Do you have power seats? Could it be related to the seat memory module?

ali2109 · 04-09-2023, 06:04 AM

I do have power seats but I very much doubt it as ive had no issues with the seats at all

seisarsm · 04-07-2024, 01:51 AM

Hi Ali2109,

I've got exactly the same fault codes with same issues, have you got any sollution so far?

ali2109 · 09-05-2024, 09:13 PM

Quote:

Originally Posted by seisarsm

Hi Ali2109,

I've got exactly the same fault codes with same issues, have you got any sollution so far?

nothing yet. please do let me know if you manage to sort it out

Bmwkuski · 01-30-2025, 03:43 AM

Quote:

Originally Posted by ali2109

nothing yet. please do let me know if you manage to sort it out

I have exactly same problem. Have you solved it yet?

seisarsm · 03-03-2025, 06:19 AM

Similar issue, and a solution, you may want to have a look, haven't tried yet

https://forums.m3cutters.co.uk/threa...11-car.254922/

Let us know if it works for you

04-02-2023, 11:01 PM	#1
ali2109 New Member 6 Rep 7 Posts Drives: BMW E92 325D (M57) Join Date: Apr 2023 Location: Manchester, UK iTrader: (0)	E92 Master window switch block not working. tried everything Featured on BIMMERPOST.com Hi i have an e92 325d. the master window switch is not working since i bought the car, i have replaced all of the fuses, checked them to no avail. I bought a new switch for the master switch which did not work, I bought a new FRM module which also did not work. I also replaced the wiring in the drivers door and inspected the plug at the A pillar which all seemed fine. what confuses me the most is that the fob will roll the window down but not from the master switch, the mirror adjustments do not work although i have randomly seen the mirrors move on their own from time to time. I have tried disconnecting both mirrors with no luck, i have all of the BMW coding tools and the errors that appear for me are 9CBA: Communication with LIN operator unit disturbed and 9CC3: communication with mirror, drivers side disturbed. when messing around with it, sometimes another error code appears which is communication with mirror, passenger side disturbed. I have been trying to diagnose this for months and have seen many other posts about this issue but none of the fixes have worked, ANY help would be much much appreciated. I was told George on the general board is good at diagnosing these kind of problems.
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04-04-2023, 06:11 PM	#2
Redd Brigadier General 4939 Rep 4,811 Posts Drives: 2010 BMW E92 M3 Dakar Edition Join Date: Jul 2015 Location: Malaysia iTrader: (0)	Man that sounds like a tough one. Do you have power seats? Could it be related to the seat memory module?
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04-09-2023, 06:04 AM	#3
ali2109 New Member 6 Rep 7 Posts Drives: BMW E92 325D (M57) Join Date: Apr 2023 Location: Manchester, UK iTrader: (0)	I do have power seats but I very much doubt it as ive had no issues with the seats at all
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04-07-2024, 01:51 AM	#4
seisarsm Registered 0 Rep 2 Posts Drives: BMW z4 2.3 sDrive 2011 Join Date: Apr 2024 Location: Cyprus iTrader: (0)	Hi Ali2109, I've got exactly the same fault codes with same issues, have you got any sollution so far?
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03-03-2025, 06:19 AM	#7
seisarsm Registered 0 Rep 2 Posts Drives: BMW z4 2.3 sDrive 2011 Join Date: Apr 2024 Location: Cyprus iTrader: (0)	Similar issue, and a solution, you may want to have a look, haven't tried yet https://forums.m3cutters.co.uk/threa...11-car.254922/ Let us know if it works for you
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