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
| Terminal No. | Content | Measuring condition | Standard |
|---|---|---|---|
| 1 ββ Chassis ground | Front camera GND | Always | Less than 1 Ξ© |
| 2 ββ Chassis ground | Front camera connection detection | When not connected | Less than 0 V |
| 3 ββ Chassis ground | Front camera image input | Cannot be measured | - |
| 4 ββ Chassis ground | Power supply for front camera | IG OFF β ON | |
| 5 | - | - | - |
| 6 ββ Chassis ground | Side camera GND | Always | Less than 1 Ξ© |
| 7 ββ Chassis ground | Side camera connection detection | When not connected | Less than 0 V |
| 8 ββ Chassis ground | Side camera image input | Cannot be measured | - |
| 9 ββ Chassis ground | Power supply for side camera | IG OFF β ON | |
| 10 ββ Chassis ground | Accessory output request | Cannot be measured | - |
| 11 | - | - | - |
| 12 ββ Chassis ground | UART (meter) | Cannot be measured | - |
| 13 | - | - | - |
| 14 | - | - | - |
| 15 ββ Chassis ground | MFD SW+ | Always | - |
| 16 | - | - | - |
| 17 ββ Chassis ground | Passenger's airbag ON | Passenger's airbag ON indicator (when illuminating) | - |
| 18 ββ Chassis ground | Passenger's airbag OFF | Passenger's airbag OFF indicator (when illuminating) | - |
| 19 ββ Chassis ground | CAN communication line (+) | Cannot be measured | - |
| 20 ββ Chassis ground | CAN communication line (-) | Cannot be measured | - |
| 21 ββ Chassis ground | GND | Always | Less than 1 Ξ© |
| 22 | - | - | - |
| 23 ββ Chassis ground | Ignition power supply | IG OFF β ON | 0 V β 10 - 14 V |
| 24 ββ Chassis ground | Battery power supply | Always | 10 - 14 V |
Factory Service Tools
Use the Manual With the Right Hardware
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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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