Do Volkswagen cars need to add a relay when installing a reverse camera?

[DelElias]

Volkswagen cars require a relay when installing a reverse camera, while other car models may not need one. The reason for adding a relay: German cars experience voltage and current instability when starting, with significant output voltage interference. The relay is added to protect the equipment. Function of the relay: The relay uses low power to control high current. Installing a relay allows the signal from the rear camera to be switched to the display when shifting into reverse gear, while also powering the camera. Therefore, a relay with multiple contact points is needed. During installation, only one wire from the reverse gear switch is required to control the relay to achieve this switching.