If you suspect that your self leveling doesn't work correctly, then you would be well advised to remove it completely* and fit non SL springs and shocks.
* Pulling the fuse/relay is not the same thing.
Also rear springs and shocks are different between saloon and estate, so shop carefully.
All know is the pipes are not connected to the rear shocks, but the pump still whirs away now and again telling me it's still trying to do something, whether it's doing anything is another story. I suppose it can't be as it's not connected up.