Parking Sensors on Ford C-Max problem?

[David W]

Hi,I have a 04 plate C-Max with front and rear parking sensors.When I start the car I hear a constant beep from the front even though there's nothing there.I have to turn them off otherwise it drives me mad!.The rears work fine,just the fronts are playing up.The switch turns off the fronts and rears,so that's no good when reversing.Does anyone know where the control module is for the fronts so I can disconnect them,so at least I can use the rear sensors.Or does anyone Else know what the problem could be,without taking it in to a ford dealer to be charged lots of money!!Any help would be great,thanks