Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b28a1 eyesight communication(ecm)

Subaru Legacy BN/BS (2015-2019) Service Manual / Eyesight (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b28a1 eyesight communication(ecm)

Detected when the engine control module (ECM) detects the malfunction of stereo camera, or when the stereo camera or ECM is assembled incorrectly.

DTC DETECTING CONDITION:

• Defective CAN system

• Defective engine control module (ECM)

• Defective stereo camera

• Incorrect assembly of stereo camera (when the stereo camera designed for EyeSight (Ver. 2) type vehicle is installed to the EyeSight (Ver. 3) type vehicle, etc.)

• Incorrect assembly of ECM (when the ECM designed for another model is installed, etc.)

TROUBLE SYMPTOM:

• All functions of EyeSight system do not operate.

• EyeSight warning light illuminates.

STEP	CHECK	YES	NO
1.CHECK ECM. Check the part number of the ECM.	Is the ECM genuine-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A1 EyeSight COMMUNICATION(ECM)	Replace the ECM. Engine Control Module (ECM) > REMOVAL Engine Control Module (ECM) > REMOVAL
2.CHECK STEREO CAMERA. 1) Remove the camera cover. 2) Check the part number of the stereo camera.	Is the stereo camera genuine-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A1 EyeSight COMMUNICATION(ECM)	Replace the stereo camera. Stereo Camera > REMOVAL
3.CHECK LAN SYSTEM. Perform the diagnosis for LAN system. Basic Diagnostic Procedure > PROCEDURE	Is DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A1 EyeSight COMMUNICATION(ECM)
4.CHECK ECM. Perform the diagnosis for the engine. Basic Diagnostic Procedure > PROCEDURE Basic Diagnostic Procedure > PROCEDURE	Is DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A1 EyeSight COMMUNICATION(ECM)
5.CHECK CONNECTOR. Check the ECM connector and the stereo camera connector.	Is the connector OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A1 EyeSight COMMUNICATION(ECM)	Repair or replace the connector.
6.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 B28A1 EyeSight COMMUNICATION(ECM)
7.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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