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 Combination Light Assembly: 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.
- Apply battery voltage between the connector terminals to check the lighting condition of the light.CAUTION:
When applying battery voltage, do not mix up the positive (+) side and the negative (-) side.
Incorrect polarity connection may cause internal LED damage.
Terminal No. Inspection conditions Specification 6 (+) - 2 (-) Apply battery voltage. Stop light on 4 (+) - 2 (-) Tail lights and rear side marker lights on 3 (+) - 2 (-) Turn signal light on 1 (+) - 2 (-) Back-up light on - Carry out the following procedure if you find any defects.
- Turn signal light: Check the harness and bulb.
- Since LED is used for the following lights, replace the combination light assembly if the light does not illuminate.
- Stop light
- Tail light
- Rear side marker light
- Back-up light
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.