1997 doesn't have door modules, that started in 2003 (for F/S trucks). The related fuses for yours should be in the dash fuse panel, but there may be a large fuse under the hood feeding multiple items; but if that one blew you should have more symptoms.
If your keyless entry is OEM, try to re-sync the remote by holding the lock and unlock buttons simultaneously for about 7 seconds.
If you don't find any bad fuses, start looking at wiring, especially where the body harness enters the driver's door.
Have you checked all the fuses in the dash panel? It probably won't be labeled as door locks.
I imagine your truck is right-hand drive, maybe there's another panel somewhere on the left side of the truck?
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