I've got what seems to be the same problem as a lot of people - the alarm on my S3 goes off randomly and the only way to stop it happening some days is to leave the car unlocked. Have read a few threads and seems that this is prob a problem with lock sensors or batteries in the boot.
My Q's are:
1. Will a diagnostics check tell me anything categorically or will I still be guessing after paying for it to be plugged in?
2. Am I right that there is no way to lock the car without alarming it?