'99 Brake Lights
 

My left & right brake lights are not working. The bulbs are good, and the CENTER light works fine. I've checked the fusebox, but can't figure out which fuse is for brakes. The fuse for Backup/Turn signal lights is good. However, if the center light works, is it not on the same circuit as the L&R? Any idea why they aren't working?

Forgot to mention that it is the base model Accent.

Couldn't find a diagram of the fuse box, maybe someone else can do that.

Sounds like a fuse, but could be a broken wire. Just take out all the 10 amp fuses and look at them.

There can only be one of two possibilities. 1) a common lead feeding voltage from the brake light switch to the corner lamps is broken or disconnected (see below) or 2) a common ground wire to the corner lights is corroded or broken. All three brake lights are fed by fuse #4 in the dash fuse box. Since the center light is working, the fuse isn't involved. Unplug the sockets and remove the bulbs to the corner units. Use a multimeter to check for voltage to the sockets while someone presses on the brake pedal. Switch the meter to measure ohms and then check the ground side of the socket for continuity. I am curious if you have checked the tail lights lately.

STOP LAMPS SCHEMATIC
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Also, check connector MR05 near the left rear unit. Voltage for both corner rear stop lights passes through this connector.

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Wow. Thanks for all the info. Unfortunately I didn't check this until I had to go to work (on a holiday). I did try to get to the center brake light, but couldn't figure it out. I got the housing off, but couldn't get it unplugged to remove it all the way. After re-assembling it, the light no longer works. I couldn't get to the wiring harness behind the panel in the back. Maybe it's loose. I guess I'll have to take it to the dealer. Thank you for the great information.

UPDATE. I took the car to the Hyundai shop. The mechanic checked the electical system and it took him 2 hours to find out that both bulbs were bad. Remember that the bulbs looked good with intact filaments. Very strange.

I think you should check the wiring completely.