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.
2020 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Electrical Specification
NOTE:
The terminal numbers of the power steering control module connectors are as indicated in the figure.
| Content | Connect or No. | Terminal No. | Input/output signal |
|---|---|---|---|
| Measured value and measuring conditions | |||
| Power supply (IG SW) | B450 | 3 | Battery voltage is detected with the ignition switch ON when measuring between (B450) No. 3 - (B452) No. 1. |
| CAN communication | B450 | 4 | Digital signal; can not be measured |
| CAN communication | B450 | 8 | Digital signal; can not be measured |
| Power supply | B452 | 2 | Battery voltage is constantly detected when measuring between (B452) No. 1 - (B452) No. 2. |
| Ground | B452 | 1 |
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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