BSI ERROR??

I have checked the fuses, and they are all OK.

I have look for ways to borrow some 12v from the lock button in the Dashboard. Is this possible without any problems regarding the central locking system?

Other places to borrow some 12v from?

Cigarette lighter or power socket (on some models) is an ideal place to take power from, its switched by the ignition.

Do you need a permanent 12v or a switched by the accessories 12v

I need a permanent 12v as a memory wire for my new radio. I have noticed that the cigarette lighter is only on when the ignition is on, so that is not an option.

Do i need to pull it from the battery then or are there other options?

If you are borrowing 12 volts for the radio it needs to be a substantial supply. On most radios, the permanent 12 volt supply is the main supply. The switched 12 volts is only a low current signal to turn the radio on and off with the ignition.
Rather than upsetting other systems, it might be safer to take a supply from the battery. The supply will need a fuse close to the battery.

Fitting an aftermarket stereo on the C3 usually only needs the pins 4 and 7 on the ISO power plug transposed to get the memory and stereo power working correctly. It would be worth checking these, they are controlled by the computer (BSI) so don't always work as you may expect.

If your new radio needs more power than the standard CD/Radio clarion unit, then as others have suggested, a fused supply from he battery live is going to give you all the amps you could ever need without worrying about burning wires or popping fuses.

Thank you for the answers!

I will contact my mechanic and ask if he is up for the job.

Both 12v dies when the bsi box cuts the power, maybe there is a wire that is not correctly placed?