It's in your fuse box. The fuse box on that car is either right beside your hood release or down on the left kick panel.
4
www.partsusa.com
yes
It indicates a problem with the airbag. When it's lit the airbag will not deploy.
Should be a reservoir on the firewall driver's side
It means one of your rear brake lights are out. Not the tailights but the brake light(s).
in the fuse box
If by 'controller' you mean the switch that makes the brake lights come on, it is not in the trunk. It is located underneath the dashboard, next to the brake pedal.
brakes and running lights have separate fuses. check the fuse then check the brake light switch under the dash
The fuse box cover labels them
try unscrewing the back light covers and replacing the lights
Check the brake switch located on your brake pedal shaft. May have to be replaced.