Hi, non runner no spanner light and comms with bsi only to read above dtcs but won't erase them , checked continuity on v line to bsi from data plug ok, and continuity on can wires between abs and Ecu and bsi all ok , I think I have a unit fault but unsure how to pinpoint which one of the three , can I meter the wires to get a ohms reading to diagnose this ? Thanks regards Jeff