Connections to the heated windshield are behind the left and right A pillar covers. Gently remove the plastic cover marked "airbag" and use a T30 driver to remove the screw. Once the screw is out, the cover pulls away easily. When putting it back, take care to nicely tuck things in, and make sure the plastic guide pin near the screw is going into the hole (it likes to go sideways).
Note that left and right halves of the windshield are on separate circuits.
On the "was my windshield heated" question, there are three things to check:
- VIN on TOPIX (I'm happy to check that if you PM me the vin, and an earlier poster also offered)
- Fuses in the fusebox (check fuse diagram for locations)
- Separate front and rear defrost buttons (as earlier posted noted)