Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b28a4 eyesight communication(eps)

Subaru Legacy BN/BS (2015-2019) Service Manual / Eyesight (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b28a4 eyesight communication(eps)

Detected when the power steering control module (EPS CM) detects the malfunction of stereo camera.

DTC DETECTING CONDITION:

• Defective CAN system

• Defective EPS CM

• Defective stereo camera

TROUBLE SYMPTOM:

• All functions of EyeSight system do not operate.

• EyeSight warning light illuminates.

STEP	CHECK	YES	NO
1.CHECK LAN SYSTEM. Perform the diagnosis for LAN system. Basic Diagnostic Procedure > PROCEDURE	Is the DTC displayed in the LAN system-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A4 EyeSight COMMUNICATION(EPS)
2.CHECK EPS CM. Perform the diagnosis for the power steering system. Basic Diagnostic Procedure > PROCEDURE	Is DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A4 EyeSight COMMUNICATION(EPS)
3.CHECK CONNECTOR. Check the EPS CM connector and the stereo camera connector.	Is the connector OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A4 EyeSight COMMUNICATION(EPS)	Repair or replace the connector.
4.CHECK STEREO CAMERA. Read the DTC. Diagnostic Code(s) Display	Is another DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A4 EyeSight COMMUNICATION(EPS)
5.CHECK STEREO CAMERA. 1) Clear the memory. Clear Memory Mode 2) Read the DTC. Diagnostic Code(s) Display	Is the same DTC displayed-	Replace the stereo camera. Stereo Camera > REMOVAL	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, or temporary open or short circuit of harness may be the cause.

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NOTE:Refer to “LAN SYSTEM (DIAGNOSTICS)” for diagnostic procedure. Basic Diagnostic Procedure1. OUTLINE OF DIAGNOSIS• Detect malfunction of CAN communication.• Judge as NG when data received from the stereo camera is not normal.2. EXECUTION CONDITIONSecondary ParametersExecu ...