Yeah the washer fluid bottle is in that corner as well, could be. If so, the connection to the washer fluid bottle is on the bottom of the bottle IIRC, so the correct harness should reach all the way down there.
I'm not sure if there's more than one crash sensor, or what the one that's cut off is.
Service Manual PDFs: (fwd.pdf is the index, the rest are per-section)
Index of /FSM/370Z/Coupe/2009
2011 download link (never tried it, and probably not much changed anyways):
2011_z.zip - 4shared.com - online file sharing and storage - download