Here's a vastly boiled-down procedure. If someone has the service manual CD-ROM, it's Pinpoint Test G. I'm afraid I can't cut and paste from my source. [EDIT: Duh... You have the CD-ROM!]
--Remove the wiper relay from the fuse junction panel.
-If wipers stop, check the relay, then check circuit 32 for short to battery +, then check wiper park position input.
-If wipers keep going, check circuit 32 for open circuit, check circuit 14 for voltage, then check for shorted circuit 32.
Best of luck!!!
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Garrick
2006 Mazda6 Grand Sport wagon, silver, MTX
I'll never forget you: Silver E0, #3895 of 6535, built 10/2/97