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mara_schulze5
Etios rear window heating issue
4 comment(s)
mara_schulze5 (Author)
That's a fair point. I haven't actually put a meter on the battery. When you say 'heavily discharged,' what kind of voltage drop are we talking about? And would that also affect the auto defrost on the windshield heating?
max_schwarz69
A significant voltage drop, typically below 12V when the engine is off, can indicate a problem. Given the error code and both the rear and windshield heating issues, a weak battery seems increasingly likely. I advise professional diagnostics at a workshop.
mara_schulze5 (Author)
You were spot on about the battery! Turns out it was on its last legs. Replaced it, and the rear window heating is working perfectly again! The windshield heating is back to normal as well. Cost me 290€ for a new battery and fitting. Thanks for the help!
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max_schwarz69
The rear window heating, also known as the window demister, relies heavily on a healthy electrical system. Have you checked the battery's voltage? A heavily discharged or defective battery can cause issues with high-current devices like the rear defroster.