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Table 1. Input and Output Signals of Each ECU Transmitting ECU Receiving ECU Signal Communication Method Main Body ECU Steering Lock ECU Power supply status (to steering lock motor) LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Sleep available status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Lock/unlock sensor status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Steering lock status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Motor control status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Diagnostic response status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Lock/unlock sensor malfunction LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Power supply malfunction (to steering lock motor) LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Motor driver malfunction LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Lock bar stuck status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Push button start function status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Lock/unlock relay drive status LIN Steering Lock ECU Certification ECU (Smart Key ECU Assembly) Main Body ECU ID Code Box (Immobiliser Code ECU) Engine start control status LIN