This solution is not feasible on all Citroen Grand C4 Picasso, in fact, for you to be able to realize this approach you must either, be able to access the trunk of your Citroen Grand C4 Picasso and have a cigarette lighter plug in it or be able to put on candles your Citroen Grand C4 Picasso and access the electrical cables through the motor shoe of it. . 3xac.