Xantia, Totally Dead, Nothing Works :(

[AnneJoh]

Hi everyone, I am a new member and asking a question for my hubby, hope you can help. He has a T reg Xantia, used regularly / yesterday but today the central locking, electrics & ignition not working and it's just dead after being totally reliable. He thought it was the key fob, we have a spare but that's not doing anything either. If the batteries are flat in the fobs can this cause all those problems? The fob for my own car doesn't work but my car still starts. Is this an even worse problem? I have searched the internet for answers but not found anything. Thanks for any advise, Anne.

[Johndouglas]

Have you checked the voltage of the battery?   Should give a reading of at least 12.5

Then check the leads on the battery terminals.