Re my Citroen Relay. When the vehicle is switched off with the doors locked after a short period of time it has started putting the off side rear stop tail light on. It either stays on or it flashes. If I open any door it stops immediately. There are no fault codes displayed and no dash board warning lights. I have checked the earth wire and all the wiring seems fine. I have changed the bulb. As soon as the vehicle is started and driven off, they work as they should. The lights are in very good condition (ie not old and tatty) Any ideas??