Hello,
my EMU Pro 16 is buzzing when the ECU is turned off.(Not when ignition is on)
I checked if the Ecu is Really Off: after turning the key its doing the configured start-up beep and the pump priming.
Here is a video of the sound.
Pulling Plug B stops the sound and plugging back plug b will not start the buzzing sound again. It will buzz after switching on ignition and then Off.
It only buzzes when the ignition is Off!
best regards
Bastian