Antiniebla lights in an Xsara Picasso

Good morning. I have an Xsara Picasso in the workshop with an electrical problem, the rear fog lights are burning constantly, even with the contact removed, they remain tenuously, with a voltage of approximately 7 volts in each light, if I give to the anti -harb lights they are normally ignited, in addition the population lights do not work, nor in front or behind. I suspect the BSI, but I am not sure, and a BSI is expensive in addition to unrecoverable once installed in the vehicle.
Does anyone know anything about this? I wouldn't want to roll it if I change the BSI and it is not.

Before doing anything, the lands and try to make new lands for the lights of Aras on occasion only that is needed.

It is not the problem of the masses, that was the first thing I looked, anyway thanks for bothering you.

You set the relay, you may be stuck.

I advise you to check the connectors in the rear headlights themselves, which many times make a bad contact and produce what is called seeking current and when passing through the bulb lights it with little intensity. Look pin to Pin Each connector clean them well and with a small screwdriver they bend inward so that they make better contact.