BIU????
 

Hi again
sorry if iam doing peoples heads in with this topic.
but its buging me.
basically scoobyclinic rebuilt my engine,fitted syvecs and toucan,since this was done,the door open light is on,the interior(door mode)boot light is constantly on and ive noticed the ignition ring light is on as well.
scoobyclinic wouldnt look into this unless i payed them.thats after spending £15,000.bull**** i know.
this is why my head is done in.
so after digging threw google this came up BIU and could be my problem???
please can anyone tell me about this part.
thanks for reading and ur replys.