Rear Defrost Model Y

[Oakley1]

Hello
when I press the enable button the message tells me to hold up indicator stalk plus press brake and key. It’s the key part I need help with please.

 

[ThunderBay3Y]

Hello
when I press the enable button the message tells me to hold up indicator stalk plus press brake and key. It’s the key part I need help with please.

Put your keycard behind the cup holders

 

[Oakley1]

Thank you will have a try in the morning.

 

[AndrewGR]

I got the key message, didn’t know what it meant and ignored it. I was still able to enable the defrost option. Now waiting for suitable weather to see what difference if any it has made.

 

[Oakley1]

All worked well this morning with the key card. Thanks for the help.

 

[Blue Photon]

Morning all! I just had a window issue with my Model Y and had some tech support over the phone. Whist fixing the issue they asked me to check on something to see it if was enabled ‘Enable Rear Defrost’. On my car it was not. The service tech told me a lot of new MYs left the factory with this disabled and told me to enable it. There have been a number of threads regarding the rear defrost so this might be the answer.

To get into service mode: Click on Software, then hold down your finger on the Model Y logo. Let go and then enter ‘service’ as the password. Then click on ‘Closures - Windows’ and you will see the enable rear defrost icon. If it has a green outline it’s enabled, if not click on it to activate.

View attachment 887392

Thank you Morpheus84 for taking the time to post this helpful topic! I followed your steps on my 2021 Model Y LRDM and got the rear defroster to work. This Tesla community is the best!

 

[T3SSY]

Thank you Morpheus84 for taking the time to post this helpful topic! I followed your steps on my 2021 Model Y LRDM and got the rear defroster to work. This Tesla community is the best!

does yours only partially defrost like this?

 

[Bikeman]

does yours only partially defrost like this?

View attachment 898724

Mine looks exactly like the picture. Is that "partially," or is that what it is supposed to do?

 

[T3SSY]

Mine looks exactly like the picture. Is that "partially," or is that what it is supposed to do?

No idea - not what my previous cars have done! Somebody can hopefully clarify, good to know yours does the same too though.

 

[Adopado]

does yours only partially defrost like this?

View attachment 898724

Are there heating elements in the area that hasn't defrosted? If there are then obviously something needs to be sorted IMHO!

 

[MattM24]

does yours only partially defrost like this?

View attachment 898724

Pretty sure the top lines are antennae.
They have smaller wires attached to them (under the trim labelled blue and black).
If you look at the lines themselves, they don’t form a loop like the lower ones.

 

[Blue Photon]

Yes, the partial defrost area in T3SSY's image is normal. As MattM24 stated the top lines are antennae from what I've read.

 

[T3SSY]

OK thanks, good to get this clarified it was bugging me a bit. Didn't get round to studying the upper lines layout TBH, as I tended to forget about it once it had defrosted!

 

[AndyWarrington]

Wondering what the purpose of this was at the time?

 

[ELECTRIC4ME]

Thank you Morpheus84! I just tried this on my 2018 Model 3 and it was still disabled. No wonder I've never been satisfied with its performance! I was behind another 3 in the snow last weekend and my rear window wasn't clearing and theirs was nicely melted away. That caught my attention!

The attached pics are of the rear window before and after the defroster was turned on for just a few seconds. (the orange on the left side is a reflection of the tree above)

 

[nrushforth]

Just done this in my MYLR I took delivery of before Christmas. Hopefully this explains why it seemed poor when defrosting the back window. Need a cold frosty morning to try this out now.

 

[Blue Photon]

nrushforth, you don't need to wait for a frosty morning. Turn On rear defrost, wait a few moments, and it should be warm to the touch laying the palm of your hand on it.

 

[nrushforth]

nrushforth, you don't need to wait for a frosty morning. Turn On rear defrost, wait a few moments, and it should be warm to the touch laying the palm of your hand on it.

Great idea. Will give it a try in the morning. Thanks.

 

[CWT3LR]

I had no issue with the rear window on my March 2022 Model Y. I hadn't updated from 2022.20, which did not have "Closures" as an option in the service menu. This weekend, I updated to 2023.2. Noticed that the option in service menu for closures was now present, but rear window NOT active. Had to select it to activate it.

I wonder if recent deliveries with more up-to-date software have it defaulted to off? Bizarre if true!