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
Electrical Specification
- Models without EyeSightNOTE:
- Terminal numbers in VDCCM&H/U connector (on the control module side) are shown in the figure.
- When the connector is removed from the VDCCM&H/U, the brake warning light (EBD warning light), ABS warning light, VDC warning light & VDC indicator light, VDC OFF indicator light, and the hill start assist warning light illuminate.
Content Terminal No.
(+) - (-)Input/Output signal Measured value and measuring conditions Power supply 6 - 13 10 - 15 V when the ignition switch is ON. ABS wheel speed sensor Front LH wheel Power supply 36 - 13 0 - 18 V when the ignition switch is ON. Signal 37 7 - 14 mA: Rectangle waveform Front RH wheel Power supply 27 - 13 0 - 18 V when the ignition switch is ON. Signal 26 7 - 14 mA: Rectangle waveform Rear LH wheel Power supply 29 - 13 0 - 18 V when the ignition switch is ON. Signal 30 7 - 14 mA: Rectangle waveform Rear RH wheel Power supply 34 - 13 0 - 18 V when the ignition switch is ON. Signal 33 7 - 14 mA: Rectangle waveform Valve relay power supply 25 - 13 10 - 15 V Motor relay power supply 1 - 13 10 - 15 V Stop light switch 2 - 13 1.5 V or less when the stop light is OFF; 10 - 15 V when the stop light is ON. Vehicle speed output signal 5 0 β 12 V pulse VDC OFF switch 20 - 13 1 Ξ© or less when the OFF switch is "ON"; 1 MΞ© or more when the switch is "OFF". CAN communication line (H) 11 Pulse signal CAN communication line (L) 10 Pulse signal Ground 13 - - Models with EyeSightNOTE:
- Terminal numbers in VDCCM&H/U connector (on the control module side) are shown in the figure.
- When the connector is removed from the VDCCM&H/U, the brake warning light (EBD warning light), ABS warning light, VDC warning light & VDC operation indicator light and VDC OFF indicator light illuminate.
Content Terminal No.
(+) - (-)Input/Output signal Measured value and measuring conditions Power supply 35 - 14 10 - 15 V when the ignition switch is ON. ABS wheel speed sensor Front LH wheel Power supply 9 - 14 0 - 18 V when the ignition switch is ON. Signal 8 7 - 14 mA: Rectangle waveform Front RH wheel Power supply 5 - 14 0 - 18 V when the ignition switch is ON. Signal 4 7 - 14 mA: Rectangle waveform Rear LH wheel Power supply 7 - 14 0 - 18 V when the ignition switch is ON. Signal 6 7 - 14 mA: Rectangle waveform Rear RH wheel Power supply 11 - 14 0 - 18 V when the ignition switch is ON. Signal 10 7 - 14 mA: Rectangle waveform Valve relay power supply 30 - 14 10 - 15 V Motor relay power supply 1 - 14 10 - 15 V Stop light switch 15 - 14 1.5 V or less when the stop light is OFF; 10 - 15 V when the stop light is ON. Stop light relay power supply 25 - 14 10 - 15 V when the ignition switch is ON. Vehicle speed output signal 22 0 β 12 V pulse VDC OFF switch 31 - 14 1 Ξ© or less when the OFF switch is "ON"; 1 MΞ© or more when the switch is "OFF". Parking brake switch 17 Pulse signal Parking brake switch 18 Pulse signal Parking brake switch 19 Pulse signal Parking brake switch 24 Pulse signal Rear brake caliper RH 2 - 3 Pulse signal Rear brake caliper LH 12 - 13 Pulse signal AVH switch 36 - 14 10 - 15 V when the AVH switch is ON Electronic parking brake operation indicator light 33 - 14 0 V when the light is on; 10 - 15 V when the light is off. CAN communication line (H) 42 Pulse signal CAN communication line (L) 43 Pulse signal Ground 14 -
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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