Buick RIVIERA 1993 Manual page 70

if the alarm has been set off, but this does not shut off
the alarm.
Here's how to avoid setting off the alarm by accident:
If you don't want to arm the theft deterrent system,
the vehicle should be locked after the doors, are
closed.
Always
unlocks
door with a key, or use the Remote
Keyless Entry System. Unlocking a door any other
way will set off the alarm.
If you set off the alarm by accident, unlock any door
with your key.
You can also turn off the alarm by using the Keyless
Entry System, if you have it. The alarm won't stop if
you try to unlock a door any other way.
How to Test The Alarm
The alarm can be tested by first having the driver's
window down. Arm the system by locking the doors
with the power door lock switch or the Remote Keyless
Entry System. Get out of the car and close the door, then
reach in through the window and unlock the door with
the manual door lock. This should set the alarm off.
If the alarm does not sound when it should, check to see
if the horn works. The horn fuse may be blown. To
replace the fuse, see "Fuses and Circuit Breakers" in the
Index.
To reduce the possibility of theft, always arm the theft
deterrent system when leaving your vehicle.
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