Airbag light flashing and the code is b1000

[Elim]

I need help with this one .  I have aygo 2006 and I got the car since 2018 and the Airbag light came on last month i did clear the code, but it came back on after 2 weeks . 
B1000 airbag ecu malfunction . 
Can anyone tell me how to fix this problem? 
thanx in advance 

[gampla]

3 main issues which can do this

 

Faulty ecu  

ecu harness is open/short

Ecu circuit poor connection (corrosion on pins, bent pins) 

 

Check connector under pass seat it can come loose after while

[flash22]

its a known issue on the early cars, more than likely an SRS ecu issue £40-70 used - check the part number of the unit in the car (lives under the centre console) and post it here as there may be an updated version

[Elim]

[flash22]

Replacement part is a 89170-0H100 not available used

like for like replacement £25

https://www.ebay.co.uk/itm/313955588530

[Elim]

Is that straight swap or has  to be programmed 

[flash22]

as long as it has no crash data, its plug and play. It has to be the same part number or the one i posted above