Hi,
I thought I would post up here to see if anyone has had similar issues with the power doors on their Kia Grand Carnival or might know a solution to help my dealer solve this once and for all. I have the 2007 Premium version.
The doors have faulted many times over the past 18 months even while sitting in my garage on totally flat concrete. They sometimes refuse to open, and just beep, othertimes they won't close and just beep at me. Also I've had a problem where they just stop in cycle! It's totally intermittent, I've had it back to the dealer 5 times and they can't find a fault. I've driven it home and it faults again!

Murphy's law I suppose!
The dealer has replaced the latch motor and actuator motor over the past few months out of good faith but the problem still exists. Also yesterday I put the kids in the car (door has to be manually opened and closed), drove to day care, and the door refused to close both manually or automatically. I phoned the RACQ, they said the latch at the bottom of the door wasn't releasing as normal and the motor was just pushing against it. We got it shut but that door is not useless because it will jamb again if I use it.
So the local dealer is getting it back again. The pain is that I take it up there for them to fix it and they have to order a part (always from Sydney) while takes 2 days, so it has to go back again!
I'm seriously thinking of taking the thing apart myself to check it over. Does anyone have a manual or schematic for the sliding doors?
While I'm here....
Other problems I've come across is a faulting indicator. It stopped working, so I bought a new bulb and drove out the dealership and all the way home with the indicator working again. turned off the ignition and it stopped working again. I replaced the bulb (who the hell came up with the idea that you have to dismantle half the car to replace a bulb needs their head read), but it's now working again. Strange!
Also. When I bought the car I took it back because an alarm dings for ages if I take my seatbelt off while the car running but is stationary, in park with the handbrake on! The dealer said they couldn't do anything about it because it was a safety feature????