Any ideas as to where I can locate it please ? Thanks

Under the drivers side ,above the footwear next to the illumination light if that makes sense

Just bought a 2004 l322 vogue with the diesel engine . When I pull the key out there's a constant piezo buzzing . If I close lockk the doors it still continues. Lights aren't on and air suspension works fine . If I pull fuse 27 in the passenger...