DTC B28A4: EYESIGHT COMMUNICATION (Electric Power Steering)

WARNING: This page is about a different variant/trim than selected.

Detected when the power steering control module (Electric Power Steering Control Module) detects the malfunction of stereo camera.

DTC detecting condition:

Defective CAN system
Defective Electric Power Steering Control Module
Defective stereo camera

Trouble symptom:

All functions of EyeSight system do not operate.
EyeSight warning light illuminates.

CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to EYESIGHT (DIAGNOSTICS) (HEV)>GENERAL DESCRIPTION>CAUTION .

CHECK LAN SYSTEM .
Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS) (HEV)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

Is the check result OK?

Yes : Go to 2.

No : Perform the diagnosis for LAN system.
CHECK Electric Power Steering CONTROL MODULE .
Perform the diagnosis for the power steering system. Ref. to POWER STEERING (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Is the check result OK?

Yes : Go to 3.

No : Perform the diagnosis for the power steering system.
CHECK CONNECTOR .
Check the Electric Power Steering Control Module connector and the stereo camera connector.

Is the check result OK?

Yes : Go to 4.

No : Repair or replace the connector.
CHECK STEREO CAMERA .
1. Turn the ignition switch to ON.
2. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC other than DTC B28A4 displayed?

Yes : Perform the diagnosis for DTC other than DTC B28A4.

No : Go to 5.
CHECK STEREO CAMERA .
1. Using the Subaru Select Monitor, perform the clear memory of [EyeSight]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS) (HEV)>DIAGNOSTIC TROUBLE CODE (DTC) .
Is DTC B28A4 displayed?

Yes : Replace the stereo camera. Ref. to EYESIGHT>STEREO CAMERA>REMOVAL .

No : 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, temporary open or short circuit of harness may be the cause.