Thank you! Glad to be here. No by always on I mean even with the ignition off and doors locked. There are no leaks and the reservoir is full of brake fluid. it's the strangest thing. My friend has a diagnostic tool and he brought it in just now. There was an error code which makes no sense to me. The code was: 48071C-Permanent-DSC unit: internal, pump, supply voltage But as you can see it is running no idea what it means by supply voltage :(