[ice745]

Some more information may help me help you find the problem. First of all, will the power door lock of Front Passenger door work if you use either the lock button from drivers door or Front Passenger door itself, or does neither work?

Secondly, if you use the power door lock button on the front passenger door, does it lock and unlock all of the other doors properly?

Third, is the power door lock on the front passenger door have no motion at all, or does it look like it moves just a tad but stops?

Fourth, does it feel any harder to manually lock the front passenger door than the other doors?

Fifth, do you have any knowledge of electronics? Do you have a multimeter with a continuity/resistance tester?

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If you don't have a continuity tester, you can pick up a cheap one at radio-shack. Or if you can just make one easy with some electronics knowledge, because we only need to know if the circuits we test are open or closed, not the actual resistance.