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ianp45
Member Since: 30 Apr 2018
Location: midlothian
Posts: 4
  
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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
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 13th Dec 2018 9:04 pm |
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ASPGuru
Member Since: 25 Mar 2007
Location: Sheffield
Posts: 100
 
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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
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| 13th Dec 2018 9:33 pm |
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BBDisco3
Member Since: 23 Nov 2008
Location: Cheshire
Posts: 3646
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My heated rear screen seems to come on without any warning lights when starting up the car in cooler weather. 
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| 13th Dec 2018 9:35 pm |
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ianp45
Member Since: 30 Apr 2018
Location: midlothian
Posts: 4
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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
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| 13th Dec 2018 10:17 pm |
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Washwipe
Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169
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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.
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| 13th Dec 2018 10:51 pm |
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ianp45
Member Since: 30 Apr 2018
Location: midlothian
Posts: 4
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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.
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| 13th Dec 2018 11:00 pm |
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RBB
Member Since: 19 Nov 2018
Location: Fife
Posts: 167
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I thought it was just me !
Mine also is on, it seems perminantly, no lights on button or dash.
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| 14th Dec 2018 7:51 am |
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Washwipe
Member Since: 19 Apr 2013
Location: Bucks Oxon Herts Border
Posts: 3169
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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.
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| 14th Dec 2018 4:11 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8228
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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.
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| 14th Dec 2018 6:30 pm |
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ianp45
Member Since: 30 Apr 2018
Location: midlothian
Posts: 4
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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.
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| 14th Dec 2018 7:10 pm |
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