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.
2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Keyless Entry Control Module
- Model without tire pressure monitoring system
Terminal No. Item Measuring condition Standard 3 (U-ART com.) - Cannot be measured - 4 (+B) ββ Chassis ground Voltage Always 10 - 14 V 7 (GND) ββ Chassis ground Resistance Always Less than 1 Ξ© - Model with tire pressure monitoring system
Terminal No. Item Measuring condition Standard 4 (IG) ββ Chassis ground Voltage IG OFF β ON 0 V β 10 - 14 V 5 (GND) ββ Chassis ground Resistance Always Less than 1 Ξ© 6 (+B) ββ Chassis ground Voltage Always 10 - 14 V 11 (U-ART com.) - Cannot be measured -
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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