Thanks for the clarification Hoonk,I am not unfamiliar with wiring diagrams but this one sure had me beat. Yes,I did mean the upper set and I replaced the defective bulb,or tried to.It now turns out that there is some melting damage to the cluster itself making it impossible for the bulbholder to stay in place properly.I am going to pick up a replacement later and will report back on result.I also found some of the wires going into the harness with damaged insulation which I will deal with before switching on On another note this will be my last Volvo,too deep a money pit.I drove my Subaru for years and had to do nothing but routine timing belt replacement and though I love the car itself there is way too much unnecessary technology in it for my taste(or pocket) and I'm sick of the constant niggles. I will let you know how I get on .