Haldex pre-charge pump humming - normal?

[Endacy]

Today I was driving with the seats folded completely flat and the radio turned off. When parking up I noticed a quiet whiney hum from the boot area of the car (heard from the inside). Pulling the Haldex fuse 31 stopped it, so it must be the pre charge pump. Is a little hum normal from this, or not? Never really noticed before but I normally have the radio on.

Should I be worried?

 

[finesse]

yes

 

[Endacy]

Yes it's normal, or yes I should be worried? I'm about to do an oil and filter on the Haldex, would be a waste if I actually need a new one.

 

[finesse]

normal, haldex oil filter 40,000miles

 

[Endacy]

Lovely. I have been doing the oil every 10k to make up for the fact it was never serviced for the first 60k of its life. After 10k it gets clunky and locks up, lots of fresh oil seems to keep it smooth.

Thanks!