Check the fuses in the fuse box. Use the diagram on the back of the cover. also check to see if there is power to them by using a light bulb tester. That should determine if you have a short or a cut wire somewhere.
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The third or High Mounted Brake Light runs straight off the brake light switch on the brake pedal arm. You say you tested the "brake unit"? I assume you mean the third brake light assembly, and if you get power there when someone steps on the brake pedal, then the bulbs are bad.
The power flow for the brake lights goes like this: Fuse ->Brake switch -> Turn signal switch -> Rear lights. The only difference is, if you have a 3rd brake light in your rear window, that gets its power directly from the brake switch. It does not go thru the signal switch first. So, if you are having a brake light problem, and your fuses are good, check the 3rd light in the rear window, if it lights up (assuming the bulbs are good, no one ever changes them), then the problem is most likely in the turn signal switch, hope this helps!
Change your turn signal switch in the steering column 99% sure that is your problem you can some times check by holding the brake pedal down and wiggling the the switch around and have someone watch to see if the come on
hi, i have sorted this problem on my 99 focus ghia.,check both your tail light bulbs.someone put the wrong bulb in and i had the exact same problems you described.the bulb for brake/tail light has two steel connecters and and all other bulbs have one.i put proper bulb in and the problem disappeared.now lights working perfect and sidelights dont come on now when i brake :)change both brake/tail bulbs on each side.1 euro will fix this problem.hope this helps.
Hi my Name is Marcus . I have a 99 toyota corolla and i have problems with the brake lights . I have change the bulbs . I have check my fuses , i have also change the brake pad switch . I was told that i to change the brake switch with a part for Toyota Dealership . Plz help me