I have the same problem with my passenger door, last week after
pulling up the button repeatedly it came open. You have activate the inside lever to do that. It worked for half a day and then locked itself again. I am still battling to get it open again, I suspect that there is a latching mechanism that malfunctions but as long as it is
locked I can't get to it. Please keep me posted if you have more
luck me. I'll give it another go later on.
Good luck, Theo
Theo Bagchus, December 2007