Getting ready to pull the front bumper cover, clean the radiators and maybe install mesh over the intakes.While I have it off I want to check the horns as they are not working. I have checked fuses and changed the relay ( I think I changed the correct one, but not sure. Mine is an 04 boxster S and the schematic I saw was a 2000 or 2001 ) but no luck. I don't hear a relay clicking when I try the horn. Anyone know of a step by step check list to isolate the problem? thanks mountainman