The rear wiper on my 2004 XC90 has packed up. The fuse is fine so I suspect the relay may have gone but can't find anything in the owner's manual or on the relays themselves about which ones do what. Does any one have a relay diagram or could you point me to a link on the web somewhere? Also, does anyone know how you get the relay panel off the wing panel in the boot? Do you have to take out the boot panel?