Rear spoiler troubleshooting

[Toyguy]

I think there may be a problem with my '98s rear spoiler. Here's what I know:

• Manual switch works fine in both directions
• Spoiler warning light comes on at startup
• Spoiler warning light goes out as car gets moving
• Reach about 80mph and there's no spoiler light

I assume the spoiler warning light should come on while the spoiler is deployed. Is that correct?

Assuming so, I have to assume it isn't deploying. I can't really see it while driving. I'll have to see if I can get someone to tail me and confirm that.

Any other troubleshooting I can do? If it is, in fact, not deploying, what do I look at next? I have a Durametric scanner on the way - will that be likely to tell me more? There are no other generic OBD-2 codes with my cheap reader.

Thanks!