Just noticed this thread, sorry I can't be much help. My 05 wagons rear wiper stops at different places everytime on intermittent, but I don't use it much anyway's.
I would think that the relay with the same part number should work. Are you sure the on/off handle is ok ?
BTW, I'm up for dirty pictures....
My wagon is dirty too...
but I did wash the SpecB last night.
216,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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