That fuse A1, right fuse box, 10 Amp feeds three things, namely Driver’s lumbar pump, passenger’s lumbar pump and the air conditioning clutch. I suppose we can forget the two lumbar pumps and concentrate on the clutch. See fig.
Power for the clutch comes from point 51 (fuse box) then through the clutch relay to the clutch, a diode and then the supplementary air valve. I would imagine that the relay is OK, but the other three things need to be tested individually for earth faults.