I realize the ‘89 may be different, but what I’ve learned about my ‘88 is that using the electric lock button without the key in the ignition will automatically activate the alarm. If the door is closed first and then locked manually with the key,the alarm is not activated. FYI the passenger door electric lock button also sets the alarm if the key is not in the ignition. With the ‘88 the only way to deactivate the alarm is using the key to unlock the drivers door.