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DIY: Non-Heated to Heated Seat Retrofit!! Lots of Pics!!!

513K views 6 replies 107 participants last post by  Pigeon  
When I swapped in my M3 seats I pulled the entire seat with rails out, just unbolt the one bolt that holds the seat belt end to the outboard rail - that way you don't have to disassemble the rail in the car as I noticed you did.

The seat belt tensioners (the buckle end of the belt) don't have to be changed. Just disassemble the yellow underseat connector attached to the seat by pulling off the black cover (slides off one way) and then the individual plugs for the seat belt tensioner circuit, power adjustments and heating can be removed from the "master" plug and swapped out as needed. I had to do this with my M3 seats as well since the new tensioners had different wiring so I had to reinstall the old ones to keep the airbag computer happy. BTW, that tensioner is an explosive, so be careful with it.
 
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