Originally Posted by Doc78

To help more we need the actual fuse number I.E fuse #9. Which effects the alarm.
The relay for the power seat is located under the drivers side dash.
As onehundred 80 stated there is no chirp for these cars originally you can purchase a buzzer now that will chirp. Tread and PDF on buzzer removal is great here. I have mine off right now rebuilding it and purchasing the batteries to repair the old one if I'm lucky.
I have other things that you can try to tell us more.
1) lock the car with the windows down and reach in and open the car. Note alarm is loud and will sound so be mindful of others during this.
If the lights flash and no alarm fuse 9 or buzzer could be the issue.
2) Spoiler issue needs further information. Take the panel off from under the trunk lid. Id use panel tools or be very careful not to break them or stab yourself I have used a butter knife to do it before but be careful anyway. I would look at the connectors under there should be three if my memory serves me right. One going to the motor for the spoiler, one going right beside that for the position sensor for the spoiler. the last going behind the plate to the third headlight. Check for corrosion or them even being plugged in. A short at the motor could be causing the fuse to blow.
Without pictures or the fuse numbers( thread on here has all makes and models with fuse numbers) I can't help any further.
Hope I helped