Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI2017SANTA FE SE, FWDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTILOCK BRAKE SYSTEM (ABS)/ELECTRONIC STABILITY CONTROL (ESC) DIAGNOSISDTC C2131: ESS BRAKE LAMP RELAY ERRORWIRING INSPECTIONCONTROL CIRCUIT INSPECTIONOPEN CHECK
2017 Hyundai Santa Fe SE, FWD
Open Check
2017 Hyundai Santa Fe SE, FWDSECTION Open Check
- IG "OFF".
- Disconnect ESS Brake Lamp Relay (ESS relay) and HECU connector.
- Measure resistance between control terminal of ESS brake lamp relay (ESS relay) harness connector and ESS brake lamp control terminal of HECU harness connector.
Specification: Approx. below 1Ω
- Is the measured value within specifications?
YES
- Go to "Short Check " procedure.
NO
- Repair open in control circuit between the brake lamp relay and HECU and then, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.