I recently put this on my brother's laptop:-
http://www.ebay.co.uk/itm/261474487029
and he has had luck with the abs giving which sensor was faulty, I'll ask him tonight if it read any srs codes. On here :-
http://www.volvoclub.org.uk/faq/ElectricalSRS.html
it mainly mentions pre 1992 under bonnet stuff not the connector in the arm rest .