If all that is working it might be a short in you wiring. I would recomend checking by the light socket.
was wondering where the inertia switch is on a 1996 Mazda protege
u may have a defective multifunction switch
Switch is defective or out of adjustment.
type it in on google
The 2001 Mazda Protoge OBD 2 port is on rear left edge of dash; next to hood rise; faces down
timing belt
Via the drip stick tube
3000 miles or 3 months
Blown fuse Bad bulbs Defective or mal-adjusted stop light switch
I have a 1993 Mazda Protege LX and I was told that there is no relay for the horn, there is a horn switch inside your steering wheel. that might help
Switch? both headlights?
Take all keys to dealership service dept.