This could be your micro switch in the door lock itself by a vw golf type four and other modelss you have an automatic locking function if you unlock your door but don t open it and most of the time it s the passengers door as it is used the least firstly check the wiring to the lock and between the door and the body then checck the micro switch on the lock if its correctly seated and if its make a click when you press on the metal arm.
Vw t5 sliding door won t open.
Look under the seat and you will see two sets of wires feeding the comfort module wrapped in a cloth tape individualy then together.
I discuss various aspects of living in a van and building a comfortable interior to live in.
My intentions and tips.
The linkage is probably broken or snapped out of place from inside the door panel.
You ll feel that the handle is much easier to move than the other doors.
Common door locking module in this video i show how to deal with the problem buy a vw g.
If you are confident and able take the door apart removing the screws and snap pieces and look for the missing linkage.
Credit for the intro music to youtuber caesar blues guitar.
A quick video of how to remove the sliding door handle on a vw t5.