Great, Thanks Bill.
I will take it out this weekend and then check the part number and possibly order a new one, I think they are around $150 on E bay if I remember correctly and if it is the right part.

Hi
I've been having issues with the alarm, took it to volvo as I could not turn off the alarm, they tried to reprogramme the remotes but were unable to. They then came back to me and said the alarm control unit is dead. Does anyone know where this is located? Has anyone had any similar issues?