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.
2021 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Hazard Switch: Inspection
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
- Measure the resistance between connector terminals.
Terminal No. Inspection conditions Standard 3 - 2 Switch OFF 1 MΞ© or more Switch ON Less than 1 Ξ© - Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.CAUTION:
When applying battery voltage, do not mix up the positive (+) side and the negative (-) side.Β
Incorrect polarity connection may cause LED damage inside the switch.Β
Terminal No. Inspection conditions Specification 4 (+) - 1 (-) Apply battery voltage. Light ON - Replace the switch hazard if it is found defective.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.