Faulty door lock - 2008 T5 2.5 128kw

[Sunny43.5]

Had the exact same problem with our T5 I found it was a micro switch that's part of the locking mechanism where the door hits the striker . I managed to squirt some oil into the mechanism and it was fixed , seems there is apart that gets sticky preventing the switch from being activated . Best way maybe is to remove the door trim and remove the lock assembly clean relube and refit or cheat like me oil the bugger . To test the theory is leave the door open and close the locking latch manually then lock the van unlock again and see if the light comes on or not , that's how I found out what part was causing the problem .