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.
2017 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Check Output
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.
- Check the voltage between connector terminals.
Terminal No. Inspection conditions Standard 2 - 3 Apply battery voltage between terminals 1 (+) - 3 (-).
When the end of stop light switch is pressed in to make the length (a) 3.6 mm (0.14 in) (actually a little shorter than 3.6 mm (0.14 in)), output voltage will be OFF.0.5 V or less Apply battery voltage between terminals 1 (+) - 3 (-).
When the end of stop light switch is pulled back to make the length (a) 3.6 mm (0.14 in) (actually a little longer than 3.6 mm (0.14 in)), output voltage will be ON.12 V 4 - 3 Apply battery voltage between terminals 5 (+) - 3 (-).
When the end of stop light switch is pressed in to make the length (a) 4.5 mm (0.18 in) (actually a little shorter than 4.5 mm (0.18 in)), output voltage will be ON.12 V Apply battery voltage between terminals 5 (+) - 3 (-).
When the end of stop light switch is pulled back to make the length (a) 4.5 mm (0.18 in) (actually a little longer than 4.5 mm (0.18 in)), output voltage will be OFF.0.5 V or less - Replace the stop light switch assembly if the inspection result is not within the standard value.
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.
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