Everlasting seat heater problems

[Mr.Jack]

I ordered new seat heating pads and was planning to install them now.
However, something came on my mind; I disconnected the plug for the pad under the seat from the rear, but this clicking sound did not stop. So I think the problem might be something else than the pad itself?
I have added a video: https://www.youtube.com/watch?v=soVJTXC7xjQ

Any ideas?

 

[Mr.Jack]

Nobody?
I want to make sure if it is the relay, switch or seat pad before I do anything.