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.
2019 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Steering Lock Control Module
| Terminal No. | Contents | Measuring condition | Standard |
|---|---|---|---|
| (B424) No. 1 ββ Chassis ground | Ground | Always *1 | Less than 1 Ξ© |
| (B424) No. 2 | - | - | - |
| (B424) No. 3 ββ Chassis ground | Steering lock motor drive power supply | Motor not operating β Motor operating | 9.5 V or more β 1 V or less |
| (B424) No. 4 ββ Chassis ground | Unlock position output | Lock β Unlock | 9.5 V or more β 1 V or less |
| (B424) No. 5 | LIN communication | ACC ON, IGN ON or power OFF, and open/close the door | Pulse generation |
| (B424) No. 6 ββ Chassis ground | Ignition power supply | Ignition switch ON *1 | 9.5 V or more |
| (B424) No. 7 ββ Chassis ground | Battery power supply | Always *1 | 9.5 V or more |
NOTE:
*1: Perform while the steering lock control module connector is disconnected.
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.
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