Avant Cabin/Courtesy light problem

Hi all, i have a problem where the rear cabin/courtesy lights don't come on when the rear doors are opened. The front lights come on ok but the rear passenger one doesnt neither does the tailgate one light up. I have checked the bulbs. Also when you open the rear doors, the bottom of the door light up as does the rear footwell light behind the front seats. This leads me to assume the door switches are ok. The reading lights work ok (rear). The rocker switch doesn't light them up either!!
Any suggestions?

Thanks.