It took me a while to get my cruise working. Seems like it was a similar situation to yours -- hoses all good, electronics all working.
I got it working by pulling the vacuum pump off and disassembling the valve end. It's pretty straightforward.
Spray everything in there with WD-40 or silicone lubricant. Make sure the motor turns. Follow the wire colours per the RAVE; connect a 12v battery to the appropriate terminals. Mine took a bit of lubrication before the motor would turn when power was applied.
Once the motor is working again, reassemble the valve end. There are some o-rings in there so you have to be careful to seat them properly.
Hopefully, after all that, your system will be functional.

And remember that after you activate the system with the dash switch, you pull the button on the steering wheel towards you to set the cruise speed.

 

Good info, thanks! So just to be clear, you are talking about the actuator motor (the thing with the 3 way hose connection) and not the plenum, correct?

Got any insight as to why I could blow "through" it? Otherwise I'm going to give a go to what you mentioned and maybe get off lucky.

 

Yes, I was meaning the motor unit and not the plenum. You can test the plenum chamber by sucking on the hose and watching it retract.
You can blow through it because the valves are one-way. Once you get the end chamber open you'll see there are a couple of them; make sure you check them for correct action. One of mine was stuck, along with the motor not turning easily.

 

Again, thank you. I might have a few minutes to pull it off today and have a look see.

However, as I'm studying diagrams, I'm trying to figure out what the diaphragm (plenum) does. Does the air that comes in actually pull that bracket on the other side (the one with the throttle cable attached to it) and that's how it works?

As I disassemble, I'll take some pics...

 

One side of the plenum is rubber. A throttle cable is attached to it. The pump draws a vacuum inside the plenum chamber, which pulls on the throttle cable.
Suck on the hose and you'll see it all happen for yourself. If the throttle cable doesn't pull back then you've got a leak somewhere.

The disassembly I described above isn't for the plenum chamber; rather it's for the pump.

 

Yep got the pump out, but prior did the "suck test" and it passed. On to the pump.

I can't find what pins to apply power to. I've found the plug, and the tests, but can't decipher which pins to. I can turn the pump by finger, so I'm thinking it's ok as are the rest of the connections, but I can't find the pin out.

EDIT:

I cracked it opened can see which wires to attach (I think it's the first 2 on the plug). I just used a AA battery to connect to both terminals on just the pump and no dice. I can turn the pump easily by hand, but nothing when I run the jump wires straight to the pump. I've used a DC battery like that before with success, so I don't think I'm doing anything wrong, but it's looking like the pump is bad. But I don't know why and I don't want to start throwing parts at it.

 

You're going to need more than a AA battery to get the motor to turn. It's looking for 12v and a little battery like that is only 1.5v.
The other thing to do while you have it apart is to blow and suck through each of the hose connections and ports on the housing. There are little check valves on each one. Mine were stuck. I suggest spraying everything with penetrating oil and trying to actuate them -- I forget if I was able to do it with my finger or if I needed to use a small screwdriver.

 

OK, you were correct- it needed more juice. Obviously, it came on hard. Now to checking the rest of the valves. I'm starting to think this might be the main control module.

Bummer, so now it looks like I'm going to need to do some of the more detailed electrical tests.

 

Here's a photo of where the cable attaches to that plastic piece. To answer your question.....no I haven't gotten the problem fixed.

 

the cable just just slides through that plastic piece. It actually attaches to a ball in the picture below that I have circled in blue