Here is a write-up of how i installed heated seats in my white i-miev:
http://i-mievlog.blogspot.com/2013/01/i-miev-diy-heated-seats.html
In a nutshell:
1. buy heating elements on e-bay
2. Phase 1: install heating element for the backseat of the driver's seat. Reuse existing wiring. It really...