54 C3 1.4HDI Door unlock fault FIXED

[kaplan1222]

Hello. I have the exact same issue here. I think changing the same relay will fix my problem.

I've just ordered one from Aliexpress.

I live in Turkey and the so called technicians' only advise was to change the entire BSI or mount another aftermarket central lock mechanism which costs a fortune.

I hope i will get the item soon. So that I can fix the problem. Thank you guys so much!

[kaplan1222]

Hello all again.

I said that I had ordered a relay from Aliexpress, but I couldn't wait for it so I went to a tech store to ask for a new relay that substitutes the one used in the board.

They gave me one that's (i guess) literally the same and it's much more cheaper. But I couldn't separate the boards (i couldn't dare to) so I torn apart the old relay and soldered the pins using thick copper wire. I connected the board to car and it works just fine.

https://ibb.co/qjJdd6t
https://ibb.co/VDwtVDt

[Tesseract_T]

Hiya, so I've been following this thread (and several others I've found online) after struggling with this issue. Id been around the houses from auto electrics garage to Citroen dealership to BSI cloning services and they all basically told me the car was scrap... Disheartening to say the least.

I ended up ordering a replacement BSI from eBay and swapped the relay boards as bit of a last ditch attempt and it worked!...

For one day. I decided to take the dog out for a drive and a long walk and when I got back to my car after said walk all my doors were perm-locked again and MOT is due in a couple months.

Makes me question if it's something else maybe not just the relay?

Has anyone else had any issues with this recurring after you initially fixed it? I am wondering if the relay on the board I replaced it with was already on its way out?

Would love to hear your ideas - I'm tearing my hair out here!