Yes you defininetly need the the relay.. Its a light green one has 5 pins. Called k93 unloader relay terminal 15. Today I finshed installing the rear footwell. Now I have to trace the seat heater elements out with and ohm metter to match what the bmw is looking for.. stay tuned for more as it comes ( dangit...My stupid butt learned the difference today between disconnecting the battery and disconnecting the ground terminal comming off the battery. Started x5 after taking seats apart again x5 wouldnt start I almost did a #2 in my pants.. Then she started beeping.. like the doors were locking and I could here the relays in the back clicking away..I checked the votlage out of battery was at 8v.. jumped and everything good except... now I got the dreaded Airbag light and ses light... doh...moral of story disconnect battery at post... disconnecting the ground near the power distribution will screw you up sooner or later.

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up