I have noticed today - after catching some youfs trying their best to get into my car whilst parked outside my workshop, that the drivers side rear door is not locking.
I always give the remote 2 presses when I lock, and for some reason tried the door handles today after said incident, and the rear door opened, but the alarm did sound immediately.
If you push in the little latch by the door release lever inside it locks as it should.
Any ideas what would cause this - answers on a postcard please.

I would guess the internal switch drives the lock directly.

Perhaps it's a faulty central control motor - perhaps jut a coincedence that theytried getting in! 2002 Honda VFR800
2002 Toyota Celica 140 Silver (mid life crisis - again!)
2007 FL2 GS Manual Army Reconnaissance Green + freel2.com sticker
2004 Toyota Celica 140 Black - Gone
2000 Toyota Celica 140 Silver - Gone
1998 Toyota Celica ST Pearl Green - Gone
1996 Nissan Primera 1.6 - Gone
1994 Rover Montego 1.6 Auto - Gone

Bad latch. I had this issue before.
Easy part to replace. Cuatro Por Cuatro