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.
2015 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Body Integrated Unit
BODY INTEGRATED UNIT CHART DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Item | Description | Relation between ECM and DTC |
|---|---|---|---|
| B1401 | M Collation NG | <Ref. to DTC B1401 M COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1402 | Immobilizer Key Collation NG | <Ref. to DTC B1402 IMMOBILIZER KEY COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
|
| B1405 | SCU Collation NG | <Ref. to DTC B1405 SCU COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1406 | SCU_EEPROM_NG | <Ref. to DTC B1406 SCU_EEPROM_NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1407 | M Communication Abnormal | <Ref. to DTC B1407 M COMMUNICATION ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1408 | Meter EEPROM Abnormal | <Ref. to DTC B1408 METER EEPROM ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1409 | SCU Communication Abnormal | <Ref. to DTC B1409 SCU COMMUNICATION ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1578 |
| B1410 | Transponder Communication Abnormal | <Ref. to DTC B1410 TRANSPONDER COMMUNICATION ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1574 |
| B1411 | Immobilizer Antenna Abnormal | <Ref. to DTC B1411 IMMOBILIZER ANTENNA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> | B1570 |
NOTE:
Perform diagnosis of engine DTC when a DTC other than an immobilizer DTC is detected. <Ref. to WRX LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
.> <Ref. to WRX STI LIST OF DIAGNOSTIC TROUBLE CODE (DTC)
.>
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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