'94 z-28 convertible top not working...

This spring my '94 Z-28 convertible top stopped going down. (no jokes please!) Up works fine. I am currently manipulating the roof manually. When I push the button to lower the top the pump in the trunk does not come
on, it does to put the top up. I guess it is supposed to come on for down, but am not sure and have not been able to find any repair manuals that include convertible top information.
I was surprised to find that the pump has only two wires going to it - I figured there would at least be a ground and an up and a down control of some sort. Needless to say I have no idea how this works, can't find manuals (but have not checked the source - GM - for fear of big $$$s.)
I considered placing the up/down three position switch in the console, but then when I saw only two wires to the pump I figured I did not understand this thing very well and there must be some circuitry between the switch and pump. I have been unable to find a wiring diagram that includes the convertible circuitry.
HELP!. Suggestions, references, etc would all be appreciated. If I was not as cost sensitive as I am at the moment I would bring the car to my local dealership, but times are not good financially...
Thanks,
Peter
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Look for relays.
I'm working off info from my '90 Mustang ragtop, so bear with me. I know that it has two relays, one for "up" the other for "down" located near the pump/motor. Follow those wires from the pump....I'll bet you have a relay out.
Have someone operate the top as you listen. One should click, meaning it works fine. You may even try tapping the one that doesn't make a sound to see if it will kick one more time to confirm.
-Donald in Austin

come
down,
and
not
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Time for a follow-up question. Following Donald in Austin's advice I listened for relays and could hear none. Next I figured I would inspect and maybe replace the up/down toggle switch in the front part of the console. After 1.5 hours of trying not to break anything I gave up trying to get at the switch.
How do I get at the convertible switch? Is below the cigarette lighter to the left of the cassette holders.
I undid the four screws securing the console and lifted the face plate that surrounds the shift lever (this is an automatic). Problem is I can not get the face place past the knob on the shifter - how do I remove the knob or is there another way?
Thanks,
Peter

come
down,
and
not
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I have a 2000 so not sure 'bout the placement of the switch. Mine is on a plate that just pops out of the consul [caution / cheap plastic broken parts + super glue].
But anyway, that would be my guess - "bad switch".
Good luck.....
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