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.
2020 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE
Inspection Mode 4
| DTC | Description & trouble part | Note |
|---|---|---|
| B1A04 | Head Lamp Lo LH Circuit Current High | - |
| B1A06 | Head Lamp Lo RH Circuit Current High | - |
| B1A08 | Head Lamp Hi LH Circuit Current High | - |
| B1A0A | Head Lamp Hi RH Circuit Current High | - |
Diagnostic procedure:
- Using the Subaru Select Monitor, perform the clear memory of [Front Relay Control Module]. Refer to COMMON (DIAG)>CLEAR MEMORY .
- Using the Subaru Select Monitor, read the DTC of [Front Relay Control Module] to check that there is no DTC displayed. Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs. After solving the DTC, repeat from step 1).
- Set the ignition switch to ON, lighting Lo SW to ON, and lighting Hi SW to ON.
- Using the Subaru Select Monitor, read the DTC of [Front Relay Control Module] to check that there is no DTC displayed. Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs.
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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