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Andrew Martin
Andrew Martin,
Category: Hyundai
Satisfied Customers: 299
Experience:  Technician at Wile Hyundai
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2007 Hyundai Santa Fe 2.7 2wd, Manual 5speed. ESC OFF and

Customer Question

2007 Hyundai Santa Fe 2.7 2wd, Manual 5speed.
ESC OFF and cruise control on, but brake lamps work. I replaced the brake switch already with a OE, but p0504 and p0571 faults come up for brake correlation/stop light switch
Submitted: 1 year ago.
Category: Hyundai
Expert:  Andrew Martin replied 1 year ago.

Hello, lets see if we can figure this out. Firstly, check the ESC 10A fuse in the under hood fuse box.

Customer: replied 1 year ago.
Fuse is ok. Already checked and just rechecked.
Expert:  Andrew Martin replied 1 year ago.

Ok assuming you checked the stop lamp fuse in the car, but how about the back up lamp fuse under the hood?

Expert:  Andrew Martin replied 1 year ago.

If the fuses are ok, double check the connector is tight and the pins are ok at the brake switch, and that the switch is adjusted properly (plunger about 1/8" out at rest) If everything looks good and you are able, check for voltage at pins 1 & 3 of the brake switch connector with the ignition on. You should have battery voltage at those two pins. If you do not, you either have a short in the power circuit of the brake switch, or you are dealing with a bad PCM.

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Customer: replied 1 year ago.
Back up fuse good. Tail bulbs good on both circuit and reverse bulb is good.
Customer: replied 1 year ago.
I have voltage at pin 1 and 2. But not 21 and 23.
Customer: replied 1 year ago.
I meant 1 & 3
Expert:  Andrew Martin replied 1 year ago.

Check resistance between Pin 23 of the PCM connector and Pin 2 of the brake switch connector.