Boot won't unlock with doors

[Robbos fiesta tdci]

Hi ppl , I got a problem with my boot not unlocking when we unlock the  car door's , its always unlocked with them but then stopped , but opens off its own button on fob , any ideas on how to relearn it to open when operating door unlock button please 

[iantt]

hello and welcome to the forum.

your problem seems to be related to the tailgate switch and not the locking system 

so the remote fob tailgate button opens tailgate ok, but when trying to open tailgate with switch fitted on tailgate nothing happens? 

very common for that switch to fail. you will need a new one.