S-Max 2011 Titaninum Reversing Lights Fault

[benny74]

Hi, I've just acquired a Smax and found the reversing lights do not work. the lamps are good and the reversing camera and parking sensors work. I linked out the switch wire at the gearbox and the camera came on and sensors worked. I thought maybe a fuse, but the reversing lights are on with the raising headlights and that's work also. I'm a bit stumped as to what to check next. Any ideas please????