Why is my rear defrost not working?

If your rear defrost is not working, it could be due to a blown fuse, a malfunctioning relay, or a problem with the defroster switch. Additionally, there may be issues with the defroster grid on the rear window, such as broken wires or a damaged heating element. Checking the fuses and inspecting the grid for any visible damage can help diagnose the issue. If those components are functioning properly, it may be best to consult a mechanic for further troubleshooting.