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      08-24-2012, 01:16 PM   #117
JimVR4
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Drives: 09 328i M-Sport 6MT
Join Date: Nov 2011
Location: San Jose, CA

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I understood your question. The motors and seat heating use different wires for powering so i doubt the electric seats will receive power if you do not do the wiring first.

You can easily check by unscrewing your seats, unplugging the seat connector and examining the harness to the seat connector to see if the power wires are present. If memory serves they are pins 4,8,9, and 13. All should be present for both electric and seat heating.
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2009 E90 328i ///M-Sport / Blue Water Metallic / Oyster/Black Dakota / PP / 6MT / 194M / Comfort / iPod+USB w/ProClip charging dash mount / $494 /
1995 3000GT Spyder VR4