hey, this literaly just started happening to my car yesterday! I have a 99 2.8q, our locks work off a vacuum. If the pump or little canister goes bad, then you have no operation of your locks. Take off your left back wheel, then take out your plastic wheel well (pain in the ass sometimes) and you'll see a small pump with some hoses and such tucked up inside, check the hoses for cracks, or leaks, check the connections, and theres a canister of some sort somewhere in that same are that i guess holds the vacuum, so check that also for leaks, don't forget about the pump as well. anyways, hope this helps, i have to do the same thing this weekend.
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