Buzzing noise

[prandall]

After my 350 sl has been standing for a while when i open a door there is a buzzing from under the bonnet for about 5 seconds

 

[Trickythemerc]

Sounds like the electronics waking up after shutdown,maybe a relay being a bit lazy or some other module coming to life.

 

[reflexboy]

Its the SBC pump. It's quite normal.

 

[prandall]

Thanks