check the fuse. check to see if the wires are damaged under the fender.
Check your fuses
May have to be turned off manually Auto sensor bad
Check the brake light switch.
Change out the switch. Bad switch!!
Check the fuse, bulbs and actual regulator switch in that order
check that you have double filament bulbs in tail lights
A person a can open the rear door from the inside. Get into the car from another door that will open and open it from the there.
The switch could be bad. There could be a loose connection on the fuse box, or on the rear of the instrument cluster.
A broken wire or short in the wiring.
wont fire, timing off, backfiring
There is a circuit board inside each light that usually shorts out. They cost around $30 each. The bulb attaches to the board
there is no relay for this. you just need to replace the switch. I had this happen to me, took me three days to figure it out.