I have a 99 SE. When I hit the keyless button to unlock the drivers door everything is fine but when I hit the button twice to unlock all the doors the doors unlock and then lock up again. This happens about 75% of the time. Same thing happens if I use the power lock button inside the car. Anybody have any idea why my doors will not stay unlocked?

 

I had a similar problem too. What I'd suggest is you change out the battery in the remote. It's not too expensive. See how the locks behave from there.