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Did you check to see if the bulbs are any good? Is power reaching the bulbs? If not, why? Bad wire, bad fuse?
Until you find the problem assuming the bulbs are good, since the rear window brake light is good, you can always tap that hot line and run it to the hot of the bulb not working and now all will work.
If the third brake light is working than we know the fuse is good and the switch is good. The third brake light bypasses the turn signal switch. If the rear turn signals are working than we also know that the wiring from the switch to the rear bulbs is also good. The brake lights and the turn signals are on the same bulb so the turn signal switch is what determines if the bulb gets power from the brake light switch or from the turn signal flasher. If the switch is bad usually the first thing that stops working is the brake lights.
Typically you can wiggle, jiggle, pull, push on the switch lever with you foot on the brake and get the brake lights to work. Sometimes turning the four way on and off several times will also get the brake lights to work. If this is the case than a new turn signal switch will solve you problem.
Most problems of this type have been traced to the headlight dimmer switch. Have the exact same problem with mine. When I hold the brake and wiggle the signal light switch the brake lights work.
In a Lumina if the brake lights quit working but the upper one in the rear window still works or your tun signals flash weakly or a different speeds the turn signal switch needs replaced. I will cure the problem. Not to hard a job, but does require removing the steering wheel and air bag assembly.
the turn signals use the same bulb as the break lights. the side you are wanting to blink to indicate your turn direction will not have a break light, but the turn signal working.
Blown parking lights fuse (check owners manual for location) If you have had an aftermarket radio recently installed, I suggest someone wired it wrong ...
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