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You can't arm the system before exiting, the arm / disarm switches are built into the exterior door handles. I'd have to re-read the repair manual, I believe if you arm the system with a door / trunk / hood open you have 30 sec to shut the door or the alarm will not arm.
Your 91 has a different alarm then the older cars, which has one semi useless feature: there is a wire / connector wrapped up in tape by the monovalve on the firewall. When the alarm is armed that wire is grounded.
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket 
Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.
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