If your Peugeot Boxer, Fiat Ducato and Citroen Relay Airbag ECU has an internal error with B0100 (a common example is the B0100-49 error) as your reported DTC then we can certainly help. We can also help if your ECU has the hardware grounding error B0102-00 Connection To ECU Grounding and also if your ECU has no communication with the vehicle or your diagnostic tool at all.
eBay