03 Z4 Sport or M Seat Retrofit? Question/Advice

Robhagen · 04-18-2011, 07:28 PM

Hi All,

I'm interested in replacing my factory non heated power leather seats in my 2003 Z4 with a set of 2007 heated power sport seats (similar to M). I am aware that I will most likely have to update the wiring harness for the heated seats and locate a new button cluster, if I want the heat to function.
Does anyone know if I will have any not so obvious problems with the retrofit, especially the wiring. Has anyone done this retrofit? I seem to recall reading through some forums a while back and remember some issues with the passenger occupancy sensor(different type for different years??).
Ideally I would just be able to plug and play for now and worry about the heat later. Just not sure if it is that simple?!!

Any input would be gratly appreciated.

Thanks, Robert

psygnosis · 04-18-2011, 08:42 PM

Only difference with M sport seats that come in a Z4 M are the ///M logos.

I don't think the wiring ever changed, but if your car lacks it, you will have to add it.

pokeybritches · 04-20-2011, 01:22 PM

The occupancy sensor is supposedly set up a little bit differently. I'll let you know in a week when I rip apart mine for some "testing" (aka trying to figure out how to get good reading with my ohmmeter and praying I don't set off the dreaded airbag light).

Edit: Check the Track subsection of the forum.

04-18-2011, 07:28 PM	#1
Robhagen Private First Class 50 Rep 147 Posts Drives: Z4, X5-35d, 2x128i Join Date: Dec 2009 Location: South Carolina/Michigan iTrader: (5)	03 Z4 Sport or M Seat Retrofit? Question/Advice Hi All, I'm interested in replacing my factory non heated power leather seats in my 2003 Z4 with a set of 2007 heated power sport seats (similar to M). I am aware that I will most likely have to update the wiring harness for the heated seats and locate a new button cluster, if I want the heat to function. Does anyone know if I will have any not so obvious problems with the retrofit, especially the wiring. Has anyone done this retrofit? I seem to recall reading through some forums a while back and remember some issues with the passenger occupancy sensor(different type for different years??). Ideally I would just be able to plug and play for now and worry about the heat later. Just not sure if it is that simple?!! Any input would be gratly appreciated. Thanks, Robert
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04-18-2011, 08:42 PM	#2
psygnosis Major 23 Rep 1,034 Posts Drives: '04 Z4 3.0i Sport Join Date: Nov 2008 Location: WA iTrader: (0)	Only difference with M sport seats that come in a Z4 M are the ///M logos. I don't think the wiring ever changed, but if your car lacks it, you will have to add it. __________________ Straightaways are for fast cars, Corners are for fast drivers.
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04-20-2011, 01:22 PM	#3
pokeybritches Colonel 479 Rep 2,782 Posts Drives: ESS/G-Power Z4M, VF Z4, 996tt Join Date: Sep 2009 Location: Los Angeles iTrader: (12) Garage List 2006 BMW Z4M [10.00] 2006 BMW Z4M [8.50] 2003 BMW Z4 3.0i [9.00]	The occupancy sensor is supposedly set up a little bit differently. I'll let you know in a week when I rip apart mine for some "testing" (aka trying to figure out how to get good reading with my ohmmeter and praying I don't set off the dreaded airbag light). Edit: Check the Track subsection of the forum. __________________ VF Engineering Z4 3.0i, ESS Z4M, G-Power Z4M, 996 Turbo
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