Join Date: Feb 2011
Location: Calgary, AB, Canada
I assume you made sure the plugs on the bottom of the seats are connected.
Other than that, you can scan for codes using a GS911 tool or have the dealer do it. If there is no continuity in the circuit, it will set a fault code. That would give you some idea on where to start searching, but I'd guess the wire from the chassis to the seat would be the most vulnerable to physical damage. Not sure on the heating elements themselves if they are subject to failures.
Calgary, AB, Canada
2008 K1200GT, 2009 F800GS