This manual provides detailed information on the connection methods and electrical system information for electrical systems installed in automobiles. This manual covers all models and includes bus systems, body systems, powertrain systems, steering systems, braking systems, lighting systems, air conditioning systems, audio systems, body control modules, safety airbag systems, on-board information systems, electrical systems, anti-theft systems, terminals and connectors. This manual also includes methods for diagnosing and repairing electrical systems.