Hi andy the point of having this is when both alarms are armed and mercedes key is used to open boot the clifford alarm will go off its really annoying and once this is done i will also have better range
When the boot release on the fob or the switch is operated the boot lid opens fully, the central locking when operated requires the boot lock catch button to be depressed to open the boot lid.
Without the correct wiring diagram for your particular car all those pictures are of little use, the best thing to do is have an alarm installer have a look, hopefully not a big job if its only one wire involved.