Heated Rear Window stopped functioning

[MisterT]

Hi all

I‘ve been visiting the forum as a guest for a few months now having taken delivery of a 4S in November.

just within the last week or so my heated rear window has stopped functioning. Press the icon and it turns orange for a few seconds and then turns back to white.

I suspect it may be something simple (fingers crossed) like a fuse, but does anybody know which fuse it would be? I’ve looked on the good to know app, but the HRW doesn’t get a mention.

Many thanks.

Andy

(thought I’d add a photo too!)

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[REIL]

Hi all

I‘ve been visiting the forum as a guest for a few months now having taken delivery of a 4S in November.

just within the last week or so my heated rear window has stopped functioning. Press the icon and it turns orange for a few seconds and then turns back to white.

I suspect it may be something simple (fingers crossed) like a fuse, but does anybody know which fuse it would be? I’ve looked on the good to know app, but the HRW doesn’t get a mention.

Many thanks.

Andy

(thought I’d add a photo too!)

Page 51 US manual Switching the heated rear window, discusses that depending on the OAT the rear window and exterior (side) mirrors, heating switches off automatically after 5 to 20 minutes.
It also discusses Using Precool /heat timer.
Have you been preheating your vehicle?
If yes, I imagine that the preheat counts towards the 5 to 20 minute limit based on OAT.
Are you trying to use the rear defrost under these conditions and getting the orange to white icon in seconds?
Just a thought.
I searched for fuses page 117–120 US manual and could not find one dedicated to the rear window defrost.
Keep us updated.
Thank you.

 

[NC_Taycan]

Porsche Good to Know app (a must have) will tell you which fuse.

 

[MisterT]

Thanks for your replies.

The heated rear window doesn’t function even when using the pre-heat function so it is definitely not working in any mode. It used to function perfectly until around a week ago.

I’ve checked the good to know app and the heated rear window isn’t mentioned - probably because it’s part of some other circuit.

I was trying to save me having to book it into a dealer, but will likely end up having to do that.

Andy

 

[TaycanTurboUK]

Hi MisterT,

Did you get this resolved as the same thing is happening on my Taycan Turbo, I put rear window heater on, turns orange but then turns white again after about 5 seconds?

No pre-heating or anything going on, just pressing the 'button' on the console, be interested in your fix as just had car back after a recall, was gone for 3 days and is an hour and half dive for me to nearest dealer.

Darren

 

[Gadzoo]

Is there any update on this issue? My rear window defroster button is doing the same thing. (Turns orange and then immediately turns white.) Outside temps are around 20 F.

 

[MisterT]

Apologies for the delayed response …

I don’t have the detail of what the issue was or how it was fixed, other than “we’ve reset and recalibrated the software’, which was also the same response I got when I took it in with a problem with a rear window refusing to close and again when a door handle refused to pop out. Seems like a stock response!

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