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.
Basic Inspection
Before performing diagnosis, check the following items which might affect problems related to Front relay control module.
- Using the Subaru Select Monitor, check the following items in the [Data Monitor] of [Front Relay Control Module]. Check that the value is within the standard (9 - 16 V). Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>DATA MONITOR
- BATT Voltage (Control)
- BATT Voltage (BACKUP)
- IGN Voltage
- Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY>INSPECTION
- Check the relay and fuse condition. Ref. to LIGHTING SYSTEM>RELAY AND FUSE>INSPECTION
- Check the connecting condition of harness and harness connector.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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