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Probably the Remote keyless Entry module.
jeffrop,
Sorry to say, but sounds like your RAP module may be the problem. Specifically, the output driver that simulates a door button press.
I say this because you say the lights flash. This indicates the RKE module has received the signal from the key fob. This should also mean the fuse is good to the RKE. (The RKE also controls the light flashing.) My truck will auto lock the doors after moving forward and releasing the brake. Did yours use to and now doesn't? If so, another indicator the RKE is bad. Replacing this modulae may mean you have to re-program the key fobs.
I purchased a CDROM off eBay that had the technical information I needed. I'll let you do the searching so I don't get in trouble for promoting a product. A trip to a service garage may be in order. (I generally do not have dealerships repair out-of warranty vehicles because they charge factory-approved warranty rates which are much higher, IMO.)
Good luck!
Roger
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