If they are just locking or unlocking (not both) it could be the one of the control/signal wires are shorting to ground. Either rubbed insulation or something the like. But since it;s BOTH. Is it only when the vehicle is off or is it when it;s in motion or both. After long trips. bumpy roads. Any kind of pattern?
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2003 Ford Taurus SES.
3.0L Vulcan Engine.
1998 Ford Explorer Sport - Sold - Bad Tranny
4.0L Cologne Engine.
1991 Geo Prizm - Rolled it 
1.6L Something or another
All of the information that I provide are from either personal experience, or documents I have read. Please perform them at your own risk.
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