It is the Nissan window regulator that makes it possible for the window glass to glide up and down with little to no friction inside of your door panel.
The life expectancy of the window regulator inside the door shell of your Nissan should last for as long as the vehicle is operating. If the seal where the window glass comes out of the door is damaged for any reason and moisture is permitted to enter the inner door panel, the metal components of this device will then surely rust. If this occurs, replacement of the window regulator might be required for the glass to move without friction or jamming; which will be a major inconvenience for you and the passengers in your Nissan.
Access to the Nissan window regulator can only be obtained through the removal of the inner door panel. With the inner door panel removed, the window glass has to be placed in the upper most position. Before the window regulator can be removed, its connection to the glass must be disconnected. This will require the glass to be held in place by the use of a wooden block or an assistant.
The entire assembly might not be affected by the rusting of this component, but removing the entire assembly is still required. Once removed, the technician will notice it cannot be disassembled any further and why this window regulator is sold as a complete unit.
Once this new component is in place, it should be reattached to the window glass and the up and down movement should be tested. This will make it the easiest to make any minor adjustments to the slides so the glass will not become pinched when it is rolled up or down. Then your Nissan window will operate as the passengers of your vehicle expect it to.