This was done on 2002 megane.
Renault megane back door wont lock.
Replacing the door lock actuator on the passenger side of a renault megane from 1999.
This video just shows a quick way to open a megane rear door if the child locks are on and the door handle breaks a common fault.
Renault megane door mechanism repair.
As you changed the lock yourself you will know how to access the lock by lifting the fabric.
This process will work with any kind of megane from around the same time.
When you lock the car which you can do with the buttons on the keycard the buttons on the handles if they still work they were a bit intermittent on my 2003 mégane or the black button in the centre of the renault diamond on the boot lid you have about 3 seconds to check that the doors are locked by pulling on the handles.
On most cars if the door will not open the door card cannot be opened without inflicting damage.