hi,having trouble with door open warning on 2000 doblo. drilled the spring loaded plunger mounted in each door and inserted a screw to extend the plunger in order to depress the other plunger further.no result so wondering how to check the other doors are registered as closed,any help? thanks

Ajar switches are built into the locks so you need to remove door panels and get your multimeter out unless you have access to Fiats examiner software or similar.