Hello Ibiza 6L1 - twin to fabi
For me, the actuator in the door stopped working overnight (right rear),
the door cannot be opened

, cut out the seat (seat, backrest), took off the upholstery, cut off the harness for the actuator 5 wires for me brown - the thickest weight
2 medium thick are the power supply of the actuator (alternating +/-) and 2 thin - signals
from the limit switches. I checked the beam was ok, the actuator on the locked door died, the child's lock was also on. I gave 24 V from two 7Ah batteries to power the actuator, the actuator moved, unlocked the lock,
I managed to open the door (I did it on purpose, bearing in mind that if the motor in the actuator is dead, then at a higher voltage the motor will achieve a higher starting torque (such a one-time impulse will not hurt it).
After disassembling and disassembling the actuator, it turned out that the motor is ok, only the actuator position limit switches are dead, when two are hit, the module cuts off the actuator control.
An intermediate recipe is to cut off the signal from the limit switches in the beam, the actuator will work, but after opening the door, the interior light will not light up, and if no other door is opened, the car will close again because the module cannot see the door opening !!!!!!!
For me, I managed to replace one limit switch with a functional one from another actuator
so the module sees the opening, but there is no feedback signal confirming the closing, I cut off the second signal from the switch because the switch was broken and it unlocked the lock only after two quick presses of the remote control.
I am sorry for the good workmanship, but after a hard day, you can think about it.
Good luck
Ps: The actuator has three positions
1 - closed with remote control - will not open the door from outside or inside
2 - closed with the buttons inside or automatically after exceeding 20 km / h - it will not open from the outside, it will open from the inside
3- open it will open from both sides unless the child lock is activated
it will only open from the outside