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.
Check Horn
- CHECK HORN OPERATION
.
Check the horn sounds when the horn switch is pushed.
Does the horn sound?
Yes: Go to 2.
No: Check the horn circuit.
- CHECK BODY INTEGRATED UNIT
.
Select and perform the [Horn Output] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>ACTIVE TEST .
Does the horn sound?
Yes: Horn circuit is OK.
No: Go to 3.
- CHECK HORN RELAY CIRCUIT
.
- Turn the ignition switch to OFF.
- Disconnect the connector of body integrated unit.
- Remove the horn relay.
- Check the harness between body integrated unit and horn relay.
Connector & terminal
(B281) No. 9 - Horn relay No. 4:
Is harness normal?
Yes: Check body integrated unit. Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
No: Repair or replace the harness.
NO RELATED
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.