You may have to push the button twice. I know on my friends '04 Tacoma he has to push the remote button and d/s doorlock button twice to unlock the passenger side. It's a saftey feature I beleive. Parked in a dark parking garage you dont want to unlock the passenger side door where someone unwelcome could get in the car. Not sure if this is 100% correct but thats the reason I was told at a dealership a couple years ago.