What is making this noise, best guess or answers on a post card

As a new owner I am getting to know our Jimny and how it all works. Its a 2009 push button hard top and as far as I can tell it all works perfectly (so far). It has plenty of rattles and squeaks but they all do that sir, but one noise has me stumped as to the source.

First journey of the day as you drive off, within a few seconds of engaging the clutch, a noise similar to an electrical motion solenoid appears (buzz) for a second, but never again until the next day or if the car is stopped for a long period. From within the car the sound source appears to be under the car, towards middle / rear.

I have googled but can only find references to clunks and bangs as you drive away for the first time, this is in no way a clunk etc. It sounds eldctrical.

Any suggestions??????

No prize given and its not something I would fix, its not an issue, but I was interested in what it could be.

Could be the ABS self testing.

On my Renault Nee-San, there is a tremendous CLUNK from the back, followed by a knocky-knocky-knocky-knocky noise about 25 yards after I first start off in the morning. I never hear it again until the next day.

That 2-3 seconds buzz, when first time driving FW or RW, after you reach 8-10kmh, comes from the ABS pump.

It is absolutely normal.