To complete the correct working of the Webasto remote installation (see thispost), i had to connect a wire between the PEU and the Webasto receiver. I was lucky to find an unused wire which runs from the PEU to the dash. A lot of work for one wire. (video)

Battery boxes and AC-150 PEU

I used the waeco MSH-60

waeco MSH-60

Remove the seat, in my case a probax lether one.

Probax seat

Carefully remove the center pads

Place the heating elements on the seat

Drill the holes for the cables