I had the same problem with my 93. You should fix it soon as you can or it will run your battery down if stuck in the wrong position. Greasing them won't help much, jus replace them. They cost about $16 a piece and arn't that difficult to replace. You will need to come in from the panel that holds the seatbelt.
Here is the part#L8423150 $15.33. Make sure you get specify the front because the rear switch is different.