Trouble shooting guide is an attachment in the second post from the top in the above link.
Sounds like you are well on the way to getting the issue resolved, but the following I have found helpful for checking the operation of the relay valve itself. It is from an earlier post of mine.
"To ensure that the relay valve (mounted on the top side of the vacuum reservoir, driver side front, inner fender) where all the vacuum hoses connect is funcitoning. On top of the relay valve, there is a manual slide switch. With the car running, sliide the switch to the open position - - the doors should open. Then slide the switch to close - - the doors should close. If not, the relay valve may be the problem.
You can also check to see that the pilot valve inside the relay valve is free to move. If you carefully feel under the relay valve, you should feel the stem of the pilot valve protruding. Carefully try to move the pilot valve stem up and down to be sure it isn't stuck. Don't push hard - the pilot valve is spring loaded against the diaphragm in the top of the relay valve. If the pilot valve is free, it should move readily. The pilot valve moves up and down sending the vacuum to the correct hoses to either open or close the doors based on the wheter the reference signal (orange striped line to the top of the relay valve) has vacuum on it (doors closed) or vacuum cut off when the light switch is pulled open (doors open).
The other probelm with the relay valve is that there is a diaphragm in the top of the valve. A busted diaphragm will make the relay valve inoperatble as well. You can check the light switch itself by removing the orange striped line to the top of the relay valve and see if you go from vacuum (switch closed) to no vacuum (switch open) with the engine running. If the vacuum switches on / off with the operation of the light switch, the switch is working.
Good news is that they have now started to supply the relay valve in the aftermarket. I have not had to use an aftermarket relay valve - still have the original one on mine, so I don't know about the quality."