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Old 01-31-2024, 04:26 PM #1
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Diagnosing Rear Defog and Heated Mirrors

After getting my 2021 Limited back from the Body Shop and it getting cold, I noticed my Rear Window Defog and Heated Mirrors aren't working.

Wiper works fine and the LED on the Rear Defog Switch is lit.

First, I can't find a Fuse Diagram that looks like what I have. I'm looking at imgVEHICLE.com but that doesn't look right.

I haven't tested the circuit across the window yet.

Seems to be some relationship between mirrors and window but can't find anything.

Obviously there has to be something like a limit switch controlling the wiper and heater. Could there be something with the switch that allows wipers but no defrost? Possible??

Thanks in advance for your thoughts.

Sorry for the large photo. This is my actual fusebox cover.
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Old 01-31-2024, 08:27 PM #2
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What kind of work was performed at the body shop? Does the rear window roll down?
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Old 01-31-2024, 10:00 PM #3
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Check MIR HTR fuse
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Old 02-01-2024, 08:06 AM #4
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Everything works except no defrost.

The MIR HTR is a relay. I'll check it but wouldn't think that would go out in 3 years.
But stranger things have happened.

Edit
OOPS
Just noticed the 10Amp MTR HTR fuse

Last edited by 3kushn; 02-01-2024 at 08:08 AM.
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