Hello and thank you for using JustAnswer.com
The window motor needs to be reprogrammed. This is not a 1 2 3 job on the Murano's I am afraid.
Some cases it's the actual window motor that is bad and that is why it looses it's programming. But you do get ones that can just loose it's programming.
To program the window motor you will need to remove the drivers door panel and unbolt the window and remove the glass. Then remove the window regulator panel and unbolt the motor and turn it over to press the program button on it.
To program it, you want to lift the window all the way up. Then press and hold the button on the window motor and put the window down not using the auto down. Once the window is all the way down, hold the button for 3 seconds, then release.
Then lift the window with out using the auto feature all the way up.
Then wait 3 seconds and recheck operation before putting everything back together.
If you have any more questions on this, please feel free to ask. Thanks Jay!
Do you have a scematic of all the door panel screws / bolts / clips that have to come off to remove the door panel?