automatic door

I have a 2007 Sedona with automatic sliding doors. the drivers side slider will not open on it's own. Actually it just will not unlatch itself. If you hold the handle until it starts to move it will close or open on it's own. What is keeping it latched? Is there a motor or a switch in the door. Don't know where to look for the fix. Any help would be appreciated.

I found the fix on utube. and the part on ebay. This is a stupid design. I had the dealer do it under warranty and now I am doing it.