Rear Passenger Overhead Lights

[Lancia 2000]

Hello all
My rear overhead lights seem to be getting confused. They previously worked fine but one bulb was out. I replaced the bulb but now the cluster won't come on when doors are opened - like the front cluster - but will light when the front cluster is switched to 'on'. Have I got rogue wiring?
Thanks
Gary

[HPsauce]

I and I think others have posted about this "elsewhere". A common cause is dry solder joints inside the rear central unit.
Take it part and resolder any obvious issues on the small circuit board inside.

[Lancia 2000]

I'm clearly not to good at searches! Thank you. Am I correct in saying the unit is prised out with a screw driver?

[HPsauce]

I don't honestly remember, might only need fingers and not a lot of force, but I think one long edge is easier than the other.
Just prise it gently and it should be fairly obvious.
Edit: Just looked at mine and the rear edge pulled down using just the tips of my fingers, no tools needed!

[Lancia 2000]

Phew thanks - destruction averted!

[Lancia 2000]

No joy unfortunately. I got the cluster out and took out all the connector bars. I cleaned up the terminals as well as the circuit board. No change. Oddly, when I pushed the cluster back into the roof opening, the lights came on correctly once! Unfortunately I couldn't get this to reoccur permanently.
Might it be worth digging around in the front cluster panel? I did have a problem with water getting behind the roof lining where I used to park up hill. I would drive off and when I braked water would pour out onto the centre console - water even sat in the front vanity lights!

[HPsauce]

But did you resolder the contacts on the circuit board?
That behaviour (sometimes it works, sometimes doesn't) is typical of dry solder joints - tiny movements make a difference.