Grid Filament Repair
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Clean broken wire tips thoroughly with a grease, wax and silicone remover. Place masking tape along both sides of broken wire. See Fig 1. Apply Repair Paste (DuPont 4817) to broken section of grid. Remove masking tape after paste has dried. Wait 24 hours before using defogger.