Interior courtesy lights not working

[Gazzab]

Just popped out to the garage and thought I would check a couple of bulbs ie reversing light not working and no bulb fitted in boot. Anyways I noticed that the interior lights arent working, tbh am not sure they have worked since I had the car. I checked and replaced fuse 8 (?). However the horn works so I dont think this is the cause.
None of the 3 interior lights are working so I doubt its the bulbs. Is there a control box or a switch of some sort?
thanks
Gary

[al 350i]

not sure on cerbs but on other cars i've found that its the switch in the door post thats normally at fault (shorting out)

[knight]

I have an intermittent fault like this, courtesy light not working/windows not going up and down when opening/closing the door. Last time I had a play with the switch at the bottom of the door and everything started working again.

[Tanguero]

The courtesy lights are controlled by the door/window ECU, triggered by the magnetic switch on the doors. If you windows are going down and back up ok when you open and close the doors then the courtesy lights should come on when they are open.

[Gazzab]

Doh! All fixed! I should have remembered that TVR manuals shouldnt be trusted! Tested all the fuses and found number 20 was blown (a 10amp). Replaced and all working again (cig lighter, int lights....). Not sure why the horn worked all the time though.