Brake lights not working

2014 KIA OPTIMA

81,000 MILES • 4 CYL • 2WD • AUTOMATIC

KENNETH BROWN JR

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The third brake light (middle) comes on, but the two side brake lights do not.
All the rear bulbs are working as I tested all of them (turning nighttime lights
on, turning on hazards, etc.). But the side rear lights do not illuminate more
when I press the brakes.
i checked the fuses, they're all fine. I also replaced the brake switch and still get the same results the harness connection where the bulbs go in are not corroded either i don't know where else to look i checked with a meter and I'm still getting power.
Any tips would be helpful. Thank you for the time.

Jan 6, 2022 at 1:41 PM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

I attached the wiring schematic for the exterior lighting circuits. I highlighted wiring for the brake lights. I need to better understand something.

You indicated you are still getting power. Do you mean the brake light socket has a power signal when the brake lights should turn on? If that is the case, confirm there is continuity to ground at the socket (black wire). I wasn't thinking that could be possible because the left and right lights have two different ground points. Also, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know.

Joe

See pics below.

Images (Click to enlarge)

Jan 6, 2022 at 6:05 PM