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.
2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Section 61 (Front Relay Control Module (Diagnostics))
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.
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Component Location
- Control Module I/O Signal
- Inspection Mode
- Diagnostic Procedure for Subaru Select Monitor Communication
- Data Monitor
- Active Test
- Work Support
- Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC B1A00: Front Relay Control Module Non-Volatile Memory
- DTC B1A01: Front Relay Control Module Battery (Control) Power Supply
- DTC B1A02: Front Relay Control Module Battery (Buck Up) Power Supply
- DTC B1A03: Front Relay Control Module IG Power Supply
- DTC B1A04: Head Lamp Lo LH Circuit Current High
- DTC B1A06: Head Lamp Lo RH Circuit Current High
- DTC B1A08: Head Lamp Hi LH Circuit Current High
- DTC B1A0A: Head Lamp Hi RH Circuit Current High
- DTC B1A0C: Front Relay Control Module Can Register Stuck
- DTC U0074: Control Module Communication Bus "Body-Can" Off
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0140: Lost Communication With Body Control Module
- DTC U0416: Invalid Data Received From Vehicle Dynamics Control Module
- DTC U0422: Invalid Data Received From Body Control Module
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:
- • 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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