I've had two seats fail, one under the 3 year warranty, the second on the two-year parts warranty. I now have the second verson of the seat, where there's a seam between the rider and pillion section. So far, it's been go.
The tests are simple, using a VOM. Set it to OHMS and measure the resistance between the brown wire and the blue wire. Now, I'll probably get this wrong, as it's a 50/50 chance and I'm too lazy to use the search feature to find out what I wrote before. But, in reality, it doesn't matter...you should see 14 ohms on the meter. It'll be 7 ohms between the brown and black. 21 ohms between blue and black. Thing is, you should see three different values, depending on which two you measure. Common point would be where the heating elements are tied together in the seat with the ground wire (brown). No readings at all means that common point has opened. A seat upolstery place might be able to get the cover off and you can then make (or have made) the necessary repairs...then recover the seat.
If the seat is good resistance wise, then change the VOM to volts and at the frame connector for the seat, look for 12v between the blue and brown wire as well as the black and brown wire AFTER the heated switch is in the full up position (and the key is on). If there's volts there, and there's resistance in the seat, then be sure the connector is in good condtion and that it's FULLY plugged into the frame socket.
No 12V, then hope it's a fuse. Otherwise, you have a switch or harness connection that's not doing its role anymore...and more quality time with your ride needs to be spent.
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