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.
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HOMESERVICE MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSSECURITY AND LOCKS - KEYLESS ACCESS (W/PUSH BUTTON START) (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC B278D ID CODE BOX RECOGNITION JUDGMENT ABNORMALDIAGNOSTIC PROCEDURE
2014 Subaru Outback 2.5i, Standard Trans
Diagnostic Procedure
2014 Subaru Outback 2.5i, Standard TransSECTION Diagnostic Procedure
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
1 CHECK DTC.
|
Is B278D displayed? | Go to step 2 . | System is normal. It is possible that temporary poor contact occurs. |
2 CHECK HARNESS.
|
With ID code box: Is the resistance 1 Ω or less? Without ID code box: Is the resistance 10 kΩ or more? Or is the terminal (i242) No. 15 disconnected? |
Replace the keyless access CM. < Refer to KEYLESS ACCESS CM . > | Repair or replace the short circuit of the harness. |
RENDER: 1.0x
NO RELATED
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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.