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
Data Monitor: List
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Contents | Display value | Note |
|---|---|---|---|
| BATT Voltage (Control) | Constant power supply from the battery. Input value to the front relay control module. | 0 - 21.5 V | - |
| BATT Voltage (BACKUP) | Constant power supply from the battery. Input value to the front relay control module. | 0 - 21.5 V | - |
| IGN Voltage | IG system circuit voltage. Input value to the front relay control module. | 0 - 21.5 V | - |
| F Wiper (RTN) Input | ON/OFF status of the front wiper return switch. Set to ON when the front wiper is outside of the stop position. | ON/OFF | - |
| R Wiper (RTN) Input | ON/OFF status of the rear wiper return switch. Set to ON when the rear wiper is outside of the stop position. | ON/OFF | - |
| Washer Level Sensor Input | ON/OFF status of the washer fluid level sensor. Set to ON when the amount of washer fluid is insufficient. | ON/OFF | - |
| Lighting Low LH Output | Headlight left side Low beam output status. Set to ON when illuminated. | ON/OFF | - |
| Lighting Low RH Output | Headlight right side Low beam output status. Set to ON when illuminated. | ON/OFF | - |
| Lighting High LH Output | Headlight left side High beam output status. Always ON when the ignition switch is ON. | ON/OFF | - |
| Lighting High RH Output | Headlight right side High beam output status. Always ON when the ignition switch is ON. | ON/OFF | - |
| F Fog Light Output | F fog light output status. Set to ON when illuminated. | ON/OFF | - |
| F Wiper Low Output | F wiper Low output status. Set to ON when Low is output. | ON/OFF | - |
| F Wiper High Output | F wiper High output status. Set to ON when High is output. | ON/OFF | - |
| F Washer Output | F washer output status. Set to ON when sprayed. | ON/OFF | - |
| R Wiper Output | R wiper output status. Set to ON when output. | ON/OFF | - |
| R Washer Output | R washer output status. Set to ON when sprayed. | ON/OFF | - |
| Wiper Deicer Output | Wiper deicer output status. Set to ON when output. | ON/OFF | - |
| R Defogger Output | R defogger output status. Set to ON when output. | ON/OFF | - |
| Outside Buzzer Output | External buzzer volume level. | Stop, 1 - 7 | - |
| Lighting Low Request | Headlight Low illumination request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| Lighting High Request | Headlight High illumination request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| F Fog Light Request | F fog light illumination request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| F Wiper Request | F wiper drive request. CAN data receiving value from the body integrated unit. | Stop/Low/High | - |
| Washer Request | F washer and R washer output request. CAN data receiving value from the body integrated unit. | Stop/F Washer/R Washer | - |
| R Wiper Request | R wiper drive request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| Wiper Deicer Request | Wiper deicer output request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| R Defogger Request | R defogger output request. CAN data receiving value from the body integrated unit. | ON/OFF | - |
| Outside Buzzer Output Request | External buzzer beeping pattern request. CAN data receiving value from the body integrated unit. | No Request (State Continuation)/Smart alert pattern 1 (n times)/Smart alert pattern 2 (n times)/Smart alert pattern 3 (n times)/Smart alert pattern 4 (n times)/Warning Pattern Stop/Answerback Pattern 1/Answerback Pattern 2/Answerback Pattern 3/Answerback Pattern 4/Answerback Pattern 5/Before No Operation Locking Automatically Pattern 1/Before No Operation Locking Automatically Pattern 2 | - |
| Outside Buzzer Volume Request | External buzzer volume level request. CAN receiving data value from the body integrated unit. | 1 - 7 | - |
| Vehicle Speed | Vehicle speed. CAN receiving data value from VDC. | 0 - 229.5 km/h | - |
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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