Our Citroen Berlingo needed to be jump started the other day but when connecting the jump leads they were connected the wrong way round for a few seconds. After switching them around the car jump started no problem. But now the radio has no stations and the time is flashing yet it wont allow us to set time or stations so there's no noise coming from radio, also the reverse parking sensors have stopped working at the same time. Cant see any blown fuses. Any ideas what could of happened and what to do ?