Thanks for the information. It looks, judging by the wiring, as if there are 2 pairs of emitters (C & E) and receivers (A & B). So I guess if I cover up C & E, hopefully that should sort it, and I can do away with keep pressing button D before I lock the car.

Does anyone know which are the ultrasonic alarm sensors on the attached photo?
Reason I’m asking is I want to cover them up, as alarm keeps going off in the middle of the night.
Alarm doesn’t go off when I turn them off (button D on photo), but have to keep remembering to do so.
Thanks in advance.