XSeries-forum

I had a new towbar fitted by a tow bar dealer in Glasgow and on picking up the car the airbag light was on. I went straight back and they did the turn the key on and off 3 times but it did not so anything.
called a diagnostic mobile specialist and they have said its a short to negative on the passenger rear curtain air bag and it cannot be reset.
where is the wiring for this and why did this happen?
any help would be great.

thanks james