Just in case any of you have a rav4 with an alarm that goes off in the middle of the night for 8 secs again and again or when your Mrs is driving on her own and comes back all shouty!
They can develop a fault that doesn't affect any function of the car apart from driving you out of it. The cure is to disconnect the block attached to the battery carrier, there is only one, and it disables the siren hidden underneath it.
Everything works as it did before but without the siren.