Disable the Seatbelt Alarm on a Toyota Corolla

Silence that awful din, but wear your seatbelt at all times regardless!

Steps

Look underneath each front seat for two in-line plugs under each front seat - one yellow, one white/cream.
Although slightly awkward (persevere, you'll get it) unplug the white one.
Check the functionality of other essential electronic items like lights to make sure you haven't disabled something else.