I just tried this, but there was so much resistance i could only lift it up a couple o inches all the way across the blind, and i asked my friend to press the button, but still nowt happened. There was a small click coming from there rear near the blind, but no movement. As soon as i let go of the blind it went stright back down again. I tried to spray some PTFE lubricant spray to what looks like the runners but didnt work.
i had the opposite with one that i bought for my CDX, would go down but only one side would work properly.
Pulled the shelf out of the car, as TB said, 3x10mm headed nuts, pulled the shelf out and then stripped the blind unit off the shelf.
Once it was free from the shelf i then detached the blind from the motor, this allowed me to push the blind up and down, clean the runners with a cotton wool ear bud and then relube it with some silicone lube, works a treat now
whole lot took about 2 hours and created all manner of shouting from the wife when she saw car parts in the living room....