There are many bits of electronics that become active as son as the door is opened. Many of those items calibrate themselves.
One thing could be the CD player if it is a loud noise. It may be searching for a disc but usually they are not active until the key is is the ignition.
There are also motorised heater flaps in the dash that also calibrate. It could also be the sat nav checking for a disc? The noise could be coming in from the bulkhead where there are many sensors that buzz and whine.
Good luck with the search.
Ampy.
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