Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
Hello, lets see if we can figure this out. Firstly, check the ESC 10A fuse in the under hood fuse box.
Ok assuming you checked the stop lamp fuse in the car, but how about the back up lamp fuse under the hood?
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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Check resistance between Pin 23 of the PCM connector and Pin 2 of the brake switch connector.