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
Rear Sub Switch
- Remove the switch - power window sub.
- Check the resistance between terminals of the switch - power window sub.
Terminal No. Inspection conditions Standard Rear 4 - 5 7 - 8 OFF Less than 1 Ω 5 - 6
6 - 81 MΩ or more 5 - 6
7 - 8UP Less than 1 Ω 4 - 5
4 - 81 MΩ or more 4 - 5
6 - 8DOWN Less than 1 Ω 4 - 6
7 - 81 MΩ or more - Check the switch light illumination condition.
Terminal No. Inspection conditions Specification Rear 6 - 7, 4 Battery connection between terminals Light ON - Replace the switch - power window sub 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:
- • 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.