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Heated rear window on?
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ianp45
 


Member Since: 30 Apr 2018
Location: midlothian
Posts: 4

Scotland 2014 Discovery 4 3.0 SDV6 SE Auto Firenze RedDiscovery 4
Heated rear window on?

Hi,I noticed that the heated rear window is on as soon as I start the car,there is no warning lights on the dash ,I know both heated screens come automatically when the temp is 4degrees or less with dashboard warning lights illuminated,but there is power is definitely on from start up even when outside temp was 9 degrees. I took the car to dealer under warranty and after the second time of going there they checked another D4 and it was doing the same as mine.They now say this is normal.But why would you want the HRW to come on when not required is the question. I am not sure how long it actually stays on for though.Has anyone else noticed this on their vehicle?
Update from the dealer,the HRW comes on for 4 minutes on start up,it’s called comfort mode.
 

Last edited by ianp45 on 14th Dec 2018 7:17 pm. Edited 1 time in total 
Post #200890013th Dec 2018 9:04 pm
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ASPGuru
 


Member Since: 25 Mar 2007
Location: Sheffield
Posts: 100

England 2016 Discovery 4 3.0 SDV6 Graphite LE Auto Corris GreyDiscovery 4

Yep, I've noticed the same on mine.
On cold starts I see the switch lights come on at the console, then go off after a few minutes.
Which seems fair enough.
But like you, I've noticed a fair few times now when it's not been cold enough for them to come on in that way, but cool enough for the litre of water that lives in the car (topped up regularly by a wet labrador) to cover the windows, that I can see lines forming suggesting the rear screen heater is on.
Obviously it's the only time I notice it, so no idea if it's 'on' at any other times.
Maybe there is some kind of sensor on there that helpfully turns them on for you.
You'd think the dealer would know for sure, wouldn't you, as they have a workshop full of experienced fully trained technicians, or so they say, but...

Cheers

Mark
 19?? Lightweight 3.5V8
1977 109" FFR
1987 110 CSW DT
1991 Discovery 200TDi
2000 Defender 110 CSW Td5
2004 VW Caravelle, that we won't talk about
2015 Discovery SE Tech 3.0 SDV6 Aruba Gold
2016 Discovery Graphite 3.0 SDV6 Corris Grey 
 
Post #200890713th Dec 2018 9:33 pm
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BBDisco3
 


Member Since: 23 Nov 2008
Location: Cheshire
Posts: 3639

United Kingdom 

My heated rear screen seems to come on without any warning lights when starting up the car in cooler weather. Thumbs Up
  
Post #200890813th Dec 2018 9:35 pm
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ianp45
 


Member Since: 30 Apr 2018
Location: midlothian
Posts: 4

Scotland 2014 Discovery 4 3.0 SDV6 SE Auto Firenze RedDiscovery 4

ASPGuru wrote:
Yep, I've noticed the same on mine.
On cold starts I see the switch lights come on at the console, then go off after a few minutes.
Which seems fair enough.
But like you, I've noticed a fair few times now when it's not been cold enough for them to come on in that way, but cool enough for the litre of water that lives in the car (topped up regularly by a wet labrador) to cover the windows, that I can see lines forming suggesting the rear screen heater is on.
Obviously it's the only time I notice it, so no idea if it's 'on' at any other times.
Maybe there is some kind of sensor on there that helpfully turns them on for you.
You'd think the dealer would know for sure, wouldn't you, as they have a workshop full of experienced fully trained technicians, or so they say, but...

Cheers
You would think that they could call on their technical services for answers to problems.The dealer in question has only been at these new premises for just a couple of years so maybe not as experienced as you would think ?
Mark
  
Post #200892013th Dec 2018 10:17 pm
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Washwipe
 


Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169

England 

It’s normal, comes on automatically when the temperature gets down to 4 or 5 degrees, possibly the same sensor that tells the FBH to fire up.
  
Post #200893513th Dec 2018 10:51 pm
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ianp45
 


Member Since: 30 Apr 2018
Location: midlothian
Posts: 4

Scotland 2014 Discovery 4 3.0 SDV6 SE Auto Firenze RedDiscovery 4

Hi washwipe,The problem is the rear screen comes on above 4degrees with no warning lights on dashboard,yes both screens do come on automatically when 4degrees as you and I know. I shall get my test lamp on it tomorrow and see if I can switch it off by pressing the button on the dash as soon as I start up to see if it switches it off. I will post my result when I test it.Regards.
  
Post #200893613th Dec 2018 11:00 pm
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RBB
 


Member Since: 19 Nov 2018
Location: Fife
Posts: 167

Scotland 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

I thought it was just me !

Mine also is on, it seems perminantly, no lights on button or dash.
  
Post #200896414th Dec 2018 7:51 am
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Washwipe
 


Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169

England 

ianp45 wrote:
Hi washwipe,The problem is the rear screen comes on above 4degrees with no warning lights on dashboard,yes both screens do come on automatically when 4degrees as you and I know. I shall get my test lamp on it tomorrow and see if I can switch it off by pressing the button on the dash as soon as I start up to see if it switches it off. I will post my result when I test it.Regards.


To add to this iirc the heated mirrors will also be switched on automatically.
  
Post #200911314th Dec 2018 4:11 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8044

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

I thought that is what the humidity sensor is for behind the rear view mirror!
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #200917014th Dec 2018 6:30 pm
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ianp45
 


Member Since: 30 Apr 2018
Location: midlothian
Posts: 4

Scotland 2014 Discovery 4 3.0 SDV6 SE Auto Firenze RedDiscovery 4

Update on this HRW ,Land Rover told me this normal on theses cars ,it powers up for 4 minutes every time ,it’s called cold comfort mode.
  
Post #200918714th Dec 2018 7:10 pm
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