If you have already checked fuses and bulbs, you can do the following:
If you have a multimeter, set it to DC voltage 20 and remove the light bulb. Have someone else press the brake pedal and touch your leads from the multimeter to the contacts (one lead on one, the other on the opposite terminal) and see if you're getting 12-14 volts DC. If you are getting the proper voltage, then the bulb should be replaced with a known working bulb.
If you are getting no power when the brake pedal is depressed, you have a break in the wire somewhere and will need to track it down.
Sometimes, there is a separate fuse for the 3rd brake light - have you checked for that fuse?
It's possible the wire leading to the 3rd brake light has been cut or otherwise damaged - possibly from overloading the trunk and items physically damaging the wire.
Another possibility is a faulty ground for that light assembly. Try to locate a service manual for the car and track down where the ground wire should be and make sure you have a solid connection.
If all else fails, take your car to a qualified technician for a closer look.
SOURCE: Both 2005 Honda Odyssey brake lights don't work.
make sure u have put the right bulbs in. rear brake lamps are dual filament....
SOURCE: 1991 Honda Accord brake light probelm.
Check the prones inside the connector that you plug into the brake light module. You may have to squeeze, wiggle, tilt each one to see which one is not connecting all that good. I know it may sound confusing. I tried to explain the best of I could.
SOURCE: No juice to the third brake light in a 93 honda accord
The right brake light sensor is located in the trunk area by the right rear taillight assembly.
SOURCE: 91 honda accord brake lights stay on replaced
are you sure you the adjustment to it is correct the button in the end of the switch has to be fully depressed to deactivate the circuit
SOURCE: brake lamp light on a 2002 Honda Accord SE
I assume you mean the one on the dash. This is an indicator that there is a problem in your braking system. Make sure it's not low on Brake fluid and have the brake system checked or check it yourself. If your going to check it yourself I recommend the Haynes repair manual on your vehicle as a reference.
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