Table 1. Communication Table Sender Receiver Signal Line Main body ECU (Multiplex network body ECU) Power back door ECU (Power back door motor unit) Power back door control switch signal Back door unlock detection switch signal Back door opener switch signal Vehicle speed signal Transmitter switch signal Shift position switch signal CAN Power back door ECU (Power back door motor unit) Main body ECU (Multiplex network body ECU) Hazard warning light signal Back door courtesy switch signal CAN Certification ECU (Smart key ECU assembly) Main body ECU (Multiplex network body ECU) Transmitter switch signal Back door opener switch signal CAN