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Probably the blinker switch ..The brake light circuit runs through the blinker switch..Let somebody look and while you have the brakes applied move the switch around and see if the lights come on
If the high level brake light works, then the brake light circuit is fully functional.
Brake light bulbs may LOOK fine, but can still have failed. Often folks don't notice that one bulb has failed until the second one has blown; it's then easy to incorrectly assume that the fault is more complex.
Try replacing the brake light bulbs: if that doesn't work then please report back for additional options.
brake lights and blinkers are the same light. (same fillament in the bulb)
You really need a 12 volt test light or a meter to chase the problem.
See what is missing at the bulb socket, as in see if you have a ground and voltage for the parking lamps (Which you should) and then voltage for the brake or directions. If you dont, re-check the fuses to see if they actually have power going in and out of each. (Key on, directionals on)
yes,they do run through the blinkers,and no you cant bypass it,the blinker switch keeps 1 brake light on continuously while the other is blinking and vice versa,
This is a common GM specific problem. Your turn signal switch contains an elaborate networking device that has to cancel brakelights while running a turn light. Often times the ground within the turn signal switch is lost causing your situation. After investigating such other possibilities as fuses and loose grounds it may become necessary to replace the turn signal switch. Thank you, Dana
Check to make sure you have the correct bulb in them. Even though the parts store may have had a part number, sometimes they don't get them right. If those are correct check the relays and or the socket itself.
I had to replace the multi function switch which is the blinker switch on the stearing column. This switch controls the rear brake lights. Had to replace this switch 2 times.
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