I need to turn off a VW Bora by remote control

Hello friends, good night I have a question, I put a GPS to a VW Bora gives me the option to turn off the car, connect it to the gasoline pump the positive there connect the GPS cable to make the current cut in case you send the command, now my question is more I can connect it that I do not affect the computer is that I do not have the electrical manual, for example I want to turn it off completely, I want to connect it. Gasoline supply I want to turn off the car also you could help me thank you very much greetings

You can cut from the coil current, the problem is that the contact is past, and to make it a contact sheet it would be a bit more complicated since you would have to interrupt the field, unless it is of contact sheet but of the positive feeding positive, it occurs to me.