Mine is 00 accord. Same symptom: high-mount brake light work fine and none of two rear brake lights works. Tail lights work fine. Measured the voltage from the connector (to tail light bulb): 12v and 12v when all lights are on, 0v and 0v when all lights are off. It seems no effect whether brake pedal is down or not. Confused. I cannot tell whether the brake lights are on too when tail lights are turned on.
So far I believe 1) fuse is good since horn works; 2) brake light switch is good because the high-mount brake light is fine. Could it be brake light sensor?

Anyone any ideas? Any help is appreciated.