FYI, if you are getting no defrost happening at all, and the fuses seem OK, then it might just be a grounding issue. It would be unlikely that the entire grid stopped working due to damage, so perhaps the terminal/connector, at the end of the wire that connects to the grid, has come loose.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV