Brake light issue

2013 HYUNDAI SONATA
170,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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ERIK FUDGE
  • MEMBER
  • 1 POST
The brake lights are all messed up. The top light works just fine when the lights are off, but the 2 side ones don't function at all, then when I turn the lights on, the lights all come on, but when the brake is pressed nothing happens. They all just stay on, it's not the depressor or the switch, unplugged the switch and they all stayed on, pressed the switch with my finger and they still stayed on with no change, except the top bar gets slightly brighter, looked at all the fuses and they look fine, don't have my multi-meter out here.
Nov 29, 2019 at 7:39 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

I looked through schematics regarding what you described. I have to be honest, it isn't a simple design. There are relays, the body control module is involved, power goes through the head lamp switch and so on. I attached the one thing I feel you could check and that is a relay. However, I doubt that is it. What needs done is the computer needs scanned. It can't be done by a basic power-train scanner, but rather one that can read all codes.

Take a look at the picture I attached. If you want the entire schematic, let me know. It will be multiple pictures, but it's not a problem if needed.

Joe
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Mar 22, 2021 at 10:45 AM
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