Can anyone tell me where i can find the door sensor which works on the passenger front (n/s/f)??

When the door is open, the interior light comes on then goes straight off?

Where as all the other doors when opened, the lights come on and remain on until the door/s is/are closed.

Has anyone else had this problem?

This has been like this for about 3months now but cant find the switch/sensor anywhere!!

unlike the older cars where there is a small black rod connected to switch!!