Hello I noticed this winter that the radio in my Golf VI (Zenec device) only starts the second time when the car was standing outside overnight and it was cold. Unfortunately, the device has no on or off switch but only goes on or off with the ignition. Therefore, I thought about buying a button like the one for the parking sensors and making a switch from it, with which I can turn the device on or off. As far as the plan. I have this I would buy a quadlock extension. I will then pick up the 12V and switch a relay in between, so that the 12V will only arrive at the radio if the relay is activated. The second position of the relay (speak when the radio is off) is supposed to make the LED light in the button. The problem is: I only have one button available and no switch. The relay only leaves power to the radio if the switch is ON. I say I would have to hold down the button permanently. Now I am looking for a solution through which I switch the relay ON and ON alternately when the button is pressed. On the Internet I came across power shock relays, but they were then intended for a 3 wired power grid in the house. Now I wanted to know how to implement this project optimally. Thank you very much.