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Do you have the key fob for the locks?
First thing you should do is take the battery out of the key fob. It might be sending signal to the door locks and causing them to cycle. It's a very common problem when they start to fail. If this doesn't help, then the next most common issue is with the door lock cylinders. They tend to corrode over time and this causes signal to be sent that will cause them to keep cycling.
In order to determine if that is the cause you have to remove the door panels and look at the door locks and the latch assemblies for any signs of green corrosion.
finally, these do sometimes have issues with the fuse box under the dash. This is called a SMJ, when this happens you can usually see some corrosion on the wires that plug into the box. If that is the case it will have to be replaced.
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