Так диагностика сама подсказывает куда копать:
DTC B28B8 EyeSight STEERING SWITCH
Detected when EyeSight steering switch is not installed or has malfunction, or when the harness is faulty or open-circuited or in stuck ON condition.
DTC detecting condition:
• Wiring of the EyeSight steering switch is not connected.
• EyeSight steering switch circuit is open.
• EyeSight steering switch circuit stays ON.
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