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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Other materials:

Inspection
1. BASIC INSPECTIONRefer to “Basic Diagnostic Procedure” in “INFOTAINMENT SYSTEM (DIAGNOSTICS)”. Basic Diagnostic Procedure2. SYSTEM BLOCK DIAGRAMRefer to “System Block Diagram” in “INFOTAINMENT SYSTEM (DIAGNOSTICS)”. Control Module I/O Signal > SYST ...