Electrical noise when opening doors

[Nathz]

Hello,
Not sure where to post this, as I am a beginner, I post it here, thanks to move it if not at the right place.
When I open a door and the lights switch on, the engine makes a "bzzuit" noise pretty loud, same when lights go off.
It seems that the noise was not that loud at the beginning, is it normal? Should I worry and ask the garage to check it?
Thanks for your advice.

 

[Loz]

Some things start when you open the drivers door like the fuel lift pump in the fuel tank runs for a few seconds. But not normally so loud that you can hear it.

 

[Lambeth Cali]

Anything else plugged into sockets etc will also suddenly fire up.

 

[Nathz]

Hello,
Nothing is plugged in. Not even the fridge is on. The very audible noise does it at opening and closing of doors.

 

[Loz]

Can you record it and upload it?

 

[Nathz]

Hope you can here it.
Had to zip it to upload.

 

[Loz]

No, that is not healthy, sounds like a relay buzzing or a stalled motor.
(could be a relay in the BCU below the steering wheel)
(Could be a relay under the left hand seat (drivers assuming yours is LHD))
If you turn off the aircon does it do it? (thinking of a flap motor)
Is it only inside the cab or can you also hear it under the vehicle where the fuel tank is (thinking of lift pump or adblue pump)