E92 Drivers Seat Lumber Support Stopped Working

Ao1 · 08-09-2014, 03:30 PM

Yesterday I tried adjusting the lumber support. I could hear the motor turning but the lumber support was not adjusting. After a while the motor stopped. The electric seat is still working and so are the seat adjusters. Passenger seat is working fine.

Any idea on how to trouble shoot? Thanks in advance.

makkan00 · 08-09-2014, 06:44 PM

It is filled with air, isn't it? Sometimes the duct which fills it can become disconnected.
I remember reading something on those lines long time ago. I'm on phone and cant search but if you search, you will find it. Good luck.

KM79 · 08-09-2014, 06:56 PM

Listen for hissing when you let go of the button.I had this and one of my inflator bags was burst.

Ao1 · 08-10-2014, 06:35 AM

I took the back off the seat to try and see what is wrong. The seat is fully functional except for the lumber support. The side bolster works. The lumber support bag is partly inflated so that appears OK. (Highlighted in the red arrow.)

Does the motor (highlighted in the red box) drive the lumber and side bolster bags? If so it would seem that the problem is between the switch on the side of the seat and the motor because the motor does nothing when the button is pressed. (highlighted in the red box in the second photo).

KM79 · 08-10-2014, 06:46 AM

Sounds like the pump is not running when requested.Have a look for broken or chaffed wiring or pull off the side trim of the seat and check the switch hadn't come unplugged.

Ao1 · 08-10-2014, 07:10 AM

Thanks

The wire connector was lose behind the switch. Problem solved.

KM79 · 08-10-2014, 08:12 AM

Good stuff

acerboo · 08-10-2014, 03:21 PM

good to hear about a simple fix for a change!

08-09-2014, 03:30 PM	#1
Ao1 Captain 123 Rep 604 Posts Drives: E92 M3 Join Date: Dec 2013 Location: England iTrader: (3)	E92 Drivers Seat Lumber Support Stopped Working Yesterday I tried adjusting the lumber support. I could hear the motor turning but the lumber support was not adjusting. After a while the motor stopped. The electric seat is still working and so are the seat adjusters. Passenger seat is working fine. Any idea on how to trouble shoot? Thanks in advance. Last edited by Ao1; 08-09-2014 at 03:41 PM..
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08-09-2014, 06:44 PM	#2
makkan00 Major General 889 Rep 9,097 Posts Drives: F83 and F36 Join Date: Dec 2011 Location: Essex iTrader: (56)	It is filled with air, isn't it? Sometimes the duct which fills it can become disconnected. I remember reading something on those lines long time ago. I'm on phone and cant search but if you search, you will find it. Good luck. __________________ F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play
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08-09-2014, 06:56 PM	#3
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)	Listen for hissing when you let go of the button.I had this and one of my inflator bags was burst.
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08-10-2014, 06:35 AM	#4
Ao1 Captain 123 Rep 604 Posts Drives: E92 M3 Join Date: Dec 2013 Location: England iTrader: (3)	I took the back off the seat to try and see what is wrong. The seat is fully functional except for the lumber support. The side bolster works. The lumber support bag is partly inflated so that appears OK. (Highlighted in the red arrow.) Does the motor (highlighted in the red box) drive the lumber and side bolster bags? If so it would seem that the problem is between the switch on the side of the seat and the motor because the motor does nothing when the button is pressed. (highlighted in the red box in the second photo). Attached Images
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08-10-2014, 06:46 AM	#5
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)	Sounds like the pump is not running when requested.Have a look for broken or chaffed wiring or pull off the side trim of the seat and check the switch hadn't come unplugged.
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08-10-2014, 07:10 AM	#6
Ao1 Captain 123 Rep 604 Posts Drives: E92 M3 Join Date: Dec 2013 Location: England iTrader: (3)	Thanks The wire connector was lose behind the switch. Problem solved.
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08-10-2014, 08:12 AM	#7
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)	Good stuff
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08-10-2014, 03:21 PM	#8
acerboo Brigadier General 181 Rep 3,923 Posts Drives: e92 335d lci Join Date: Jul 2008 Location: kent iTrader: (2)	good to hear about a simple fix for a change!
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