Mirai rear window heating issue

Hi, I have a 2022 Toyota Mirai (electric engine) with 164201 km on the clock. The rear window heating isn't working. The error memory has stored an error, and the windshield heating also seems less effective than usual. Could a heavily discharged or defective battery really be the culprit?

4 comment(s)

I also own a Mirai. I had a similar issue last winter. Does the light on the rear window heating button illuminate when you press it? If it does, does it stay on, or does it blink or turn off after a short period?

Yes, the light comes on when I press the button, and it stays on. I don't see any blinking or turning off.

Okay, in my case, the light also stayed on, but there was still no heat. Considering you also have an error code stored, and the windshield heating is also affected, it strongly points towards a battery issue affecting the heating system's performance. I'd recommend getting it checked out at a workshop.

Thanks for confirming. I took it to the workshop, and you were right; it was related to the battery. The repair cost was 290€. Now the rear window heater works perfectly again!

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