Why is my 2014 chevy impala rear defroster not working?

There are a few reasons why the rear defroster isn't working in your 2014Chevy Impala, but the most common problem is a blown fuse. The rear defroster draws a lot of power, so needing to replace the fuse is not at all uncommon.Have you tried scraping ice off the window and perhaps damaged the grid wires? Those wires are very sensitive. One broken connection can eliminate power through the entire grid.Also, the wiring may be faulty or disconnected, preventing the heat from reaching the grid. Another possible cause is the rear defroster relay. If it's defective or loose, the flow of electricity is blocked. You can find out where the relay is located in your owner's manual.Other less common causes for the defroster to stop working in your 2014 Impala include an issue with the rear defroster switch, tabs, and wires that attach to the tabs.