http://www.justanswer.com/peugeot/6vjgo-peugeot-307-auto-electrician-today-tell.html#re.v/416/
http://www.datsc.com/tabid/122/OBD-Error-Code/P1631/Diagnostics/peugeot/Default.aspx
http://www.bba-reman.com/content.aspx?content=peugeot_bsi_body_control_failure
Actually you could contact bba reman and see if they can advise - Try
http://www.bba-reman.com/content.aspx?content=how_to_contact_bba_reman
XXXX
December 2015