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If the rear window defroster isn't functioning in a Toyota Aygo, the initial step I recommend is to examine the fuse connected to the defroster unit. If the fuse is blown, the system won't receive power, preventing it from activating. Additionally, inspect the wires and patterns within the glass. If any are fractured or impaired, the glass won't heat properly. To fix this issue, typically, you'll need to replace the entire rear glass panel with a new one to ensure continuity.
I can't say for certain, but it could be worth checking to see if the fuse in your car is bad or burnt out.
How can you adjust the rear defroster switch on a Toyota Aygo?
If the rear window of your Toyota Aygo is not functioning properly, the issue typically lies with either the window motor or the regulator.