1. Increased Current Handling: Power windows require a relatively high amount of current to operate. A relay acts as a switch that controls a separate circuit, allowing a small current signal from the window switch to control a larger current in the power window circuit, reducing the load on the switch.
2. Improved Circuit Protection: A relay introduces an additional layer of circuit protection by isolating the control circuit (switch) from the power circuit (window motor). If a fault occurs in the power circuit, the relay can disconnect it, preventing damage to the switch and other components.
3. Versatility in Switch Locations: Relays allow the window switches to be placed in convenient locations, such as on the door panels, without requiring heavy-duty wiring throughout the vehicle.
4. Remote Operation: Relays enable the power windows to be controlled remotely using a key fob or other wireless device.
5. Automatic Window Functions: Relays can be integrated into automatic window opening and closing functions, such as one-touch up/down windows and anti-pinch features, which require precise control over the window motor.
6. Safety Precautions: Relays can incorporate safety features, such as disabling the windows when a door is open or when a child lock is engaged, providing additional protection against accidental operation.
7. Circuit Diagnosis: Relays can simplify the diagnosis of electrical issues related to the power windows by providing a clearly defined point of separation between the control circuit and the power circuit.
Overall, while not essential, relays offer several advantages in power window systems, including improved current handling, circuit protection, versatility in switch placement, remote operation, automatic window functions, safety features, and easier diagnosis.
