Quote:
Originally Posted by AuSeeker
I'm pretty sure I read the reason the glass was breaking was the electrical connection area itself was overheating and thus heating that corner of the glass causing uneven expansion which breaks the tempered glass.
Also here's a link to the Toyota "Extended Warranty" Technical Service Bulletin explaining the coverage, condition/inspection, etc. and it states that the condition can be identified by broken glass and discoloration surrounding the defroster electrical connector, there are photos as well.
https://static.nhtsa.gov/odi/tsbs/20...31801-9999.pdf
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The takeaway here is, DO NOT use the defroster. Don't be lazy and scrape the rear window before your drive.