What is the function of the Volkswagen Lavida 126 relay?

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When the starter motor operates, it requires a large current. The key is used to control the starter motor. If the key is connected and a large current flows from the key to the starter, the key must be made large and bulky to withstand frequent high current without burning out. Additionally, thick wires would be needed to connect the battery, key, and starter motor, which is not cost-effective, unreliable, and inconvenient for maintenance. Here is additional information: Automotive relay: When the key is turned off, the pull-in coil inside the starter relay loses power, the magnetic force disappears, and the starter circuit contacts open under the action of a spring, cutting off the current to the starter motor, which then stops working. The starter relay is built to be robust, allowing frequent high current passage, thereby improving circuit reliability. Consistent with the general function of relays, relays in the electrical automation industry act as "switches," serving as the intermediate link that controls the opening and closing of one circuit to control the next. Automotive relays typically use electromagnetic or solid-state designs.