Brake lights not working

2004 HYUNDAI XG350

100,000 MILES • 6 CYL • 2WD • AUTOMATIC

LARRY NASON

MEMBER
48 POSTS
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I have no brake lights I've checked all the fuses that I knew of the under – fuse box and under hood fuse box the fuses are good. but there is no power at the fuse under the dash for the brake lights. the hazard lights also do not work. all bulbs are good, brake switch is brand new. is there any relays that go to the brakes that I might check? do you have any other ideas where I should look?

Jun 15, 2020 at 10:27 AM

ASEMASTER6371

CERTIFIED EXPERT
52,796 POSTS

Good afternoon,

I attached the diagram of the lights. We need to do some testing to make sure the voltages are there.

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

I circled the fuse you need to test and the switch on the brake pedal.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Roy

Images (Click to enlarge)

Jun 15, 2020 at 11:01 AM

LARRY NASON

MEMBER
48 POSTS

Hello. sorry, the lateness of my response I've been real busy. It's got a new brake switch in it it's getting power to it but what I failed to mention earlier to was the controls for the driver seat don't work either. my guess is there's a short somewhere because sometimes the breaks in the seat will work and other times it won't. but when the brakes don't work the seat won't work. I tested the fuse the other day under the dash and have power to it but when I checked it right now there's no power to it what should be my next step? I think you again for all of your help.

Jul 23, 2020 at 2:34 PM

ASEMASTER6371

CERTIFIED EXPERT
52,796 POSTS

Okay, I attached the diagram for you of the fuse and it controls a lot.

It is fed by a common buss bar in the fuse block.

The fuse block itself is the issue. There is an internal failure in the fuse box and it must be replaced.

Roy

Images (Click to enlarge)

Jul 23, 2020 at 3:05 PM