If the engine is considered the heart of a car, then the electrical system can be vividly described as the "nervous system" and the brain of the vehicle. It is responsible for ensuring the stable operation of the entire vehicle, allowing it to smoothly execute various operations. It is key to the future of vehicles in achieving information interaction and complex operations, and it is also the core competitiveness of automotive companies. We will complete 5 tasks in this course. First, let's start with Task One: Understanding the Development of Automotive Electrical Systems. Task II: Understanding the Composition of Automotive Electrical Systems. Whole-vehicle line power distribution device: Include the central junction box, fuse devices, relays, wiring harnesses and connectors, and circuit switches, etc. Any automotive electrical appliance and electronic control device that obtains power supply must go through fuse devices, connectors, switches, relays, and wires, and other basic components. Basic components of automotive electrical appliances mainly include ignition switches, combination switches, relays, fuses (safety wires), fusible links, circuit breakers, wiring harnesses, and connectors, etc. Task 3: Understanding the Characteristics of Automotive Electrical Systems. Task Four: Using Automotive Diagnostic Tools. The automotive electrical system is an important component of automotive technology, which involves multiple aspects of the vehicle. Familiarity with electrical systems is crucial for understanding the working principles of automotive electrical systems and troubleshooting.