93 G20 cruise problem

My cruise stopped working. I checked the switch, its ok. I checked the fuse under the hood, it's ok. What else is left besides the vacuum pump. Also, where can I get one? Every parts store claims that they cant get it. If it is dealer only, how much is it? Thanks for the help.

I had same problem, but it turned out that it was a bad "Cancel" switch - how do you know that it's not one of the switches? A trip to the dealer (or Nissan/Infiniti mechanic - someone with a Nissan diagnostic computer) is probably required.

-Frank