Power sliding doors won't open when ignition is on, or after the van started.

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I bought it as a flood vehicle with the fuse boxes changed. I've already put on 25,000 miles. The only persisting problems it got is 1)Power sliding doors won't open when ignition is on, or car started(it'll power close; if sliding doors are open and the car is on then there's a constant beeping sound) 2) airbag light stays on after the car is started and 3) the a/c comes on even when it's off during time of high humidity. The flood line came up to the middle of the cool box. I really want to keep the van even though I regret getting it as a flood vehicle.