Bought a Crossland x 2019 1.2 engine very low mileage with electric fault, sadly didn’t know it had French wiring ( how could Vauxhall agree to that ) , noticed it’s has a new fuse box inside,radio always works, no power to dash or much else , oddly if you slam a door mostly passenger front dash lights up and radio comes on like my mokka x , can’t find any fuses blown that I, all 3 fuse boxes have 12v , electric windows are down, they show 7.5v but how French there all black wires

I another strange one is after banging passenger door and light on dash come on , oil check etc , radio on , air con lights on , central locking light on , push the hazard button and they all go out straight away. Car more than likely has about 5k miles .

That sounds more like either a loose connection or a Can-Bus fault.
I would start by doing a 'wiggle test' which is basically wiggling wires until you invoke the fault and the lights comes on
Start with the door wiring where it goes into the door from the pillar

On 3/26/2023 at 1:38 PM, stewart229 said:

2020 crossland 1.2 Griffin 17k miles. I have this annoying fault where there is no 12v electrical power at all, put key into ignition and nothing- no ignition or warning lights at all, if doors locked they wont open with key if doors are not locked if I slam the door or open bonnet and bang the battery the power comes back on and the clock reverts back to zero and ignition then works and car will start.

Any ideas?

 

I did a reset on the bsi unit , radio is set to uk now , have middle interior light on , when you start to undo the door connector it’s dash board lights up , air con lights up even though ignition is off , even turning on makes no difference, found earth post on inner sill at front both sides , have connected to earth as well just in case , now got another ignition and fuse box cheap , have noticed battery earth has various earths , I put power to electric mirrors and both work but doesn’t like it when I try to put windows up , all black wires in door but connection is coloured lol .

Got a second hand bsi unit for £17 delivered, put it in wired it all up after cleaning earths checking loads of electrics , almost everything works now , guess previous owner got new bsi unit then blew it up …. Now need another one and programmed by Vauxhall and hopefully it will be ok .