01 Honda accord third brake light works! left and right does not! fuse and bulbs good!

 

Do you have a good 12volt power or a good ground? Do an ohm test on the grounds you want 0. This sounds dumb but are you using the rite bulbs their is a 1 and 2 filament.


If your tail lights work your ground is probably good. Thy use a 3 wire design one is 12 hot for the tail lights one is 12 volts hot for the brake lights and one is ground. The tail lights and the brake lights share the same ground get my drift?

 

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.

 

Check the brake light switch. It should be attached to the brake pedal under the dash.

Unplug the switch and use a pin / wire to complete the circuit. If the lights go on, it's a bad switch.

 

Did you look at your bulbs if thy are black replace them.

 

Fuse, Thank you for the input. The bulbs look a little black but tested fine. Anyway I bought a new pair. Still no luck.

e3NiNe, I unplugged the switch and now I need your further help on how to complete the circuit. It has fours wires: w/b, w/yellow, green and gray. I thought the switch was fine since the high-mount brake light is good. Still I want to try the approach you suggested. Thank you for the help.

 

e3NiNe, I connected wire w/y to w/b. Only the high-mount brake light goes on. Both voltages (w/y to green and to gray) are 12+v. The problem seems existing after the brake light switch.

 

Ya your brake switch is fine. Do you have a coupe or sedan the coupe has 4 brake lights 2 inner and 2 outer. The sedan only has 2 lights. Any way thy are 3 wire going to any brake light one will have 12 volts with the brake pedal pressed, one will have 12 volts with the headlights turned on one is the ground it will have next to 0 volts. You said yourself It seems no effect whether brake pedal is down or not and your taillights work fine this means your ground is fine. Your brake switch is working but power is not getting to the other brake lights end of story. You have an open wire between your brake switch and your brake lights or your dumb brake light failure senser has failed lol.

I think it is the brake light failure senser it runs power to the brake lights but not the high mount on the coupe or sedan. Its a little gay black box with 5 wires running to it coupe or sedan its in your trunk next to the brake lights.

 

I read the electrical schematic but found little information online or in the repair manual (Chilton) about the sensor. I even asked one Kragen guy when in store. Checked again after reading your post and couldn't find the sensor. Only a bare connector is there. I thought it's a spare connector. I guess the sensor got loose and went out. I'll check it out in local dealer tomorrow morning.

A similar case, but happened to Camry. http://www.camryforums.com/m_9254/tm.htm

 

Thank you, Fuse!
It's the sensor. I couldn't find the sensor in the trunk. Just connected two pins and tried OK. The car has been to a body shop about 7 months ago and only recently two people told me my brake lights were out.