Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
Heated mirror logic
Can someone please explain the logic for the heater mirrors?
Rain drops on the mirrors don't get heated off using either front or rear window heat.
Does the car need to think its actually raining ie auto sensor detecting or wipers on?Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
26th Jan 2014 4:04 pm
Broadsword
Member Since: 12 Mar 2013
Location: Hastings
Posts: 65
On any car I have had, heated mirrors only remove mist and frost for which they are designed. In most cars I have known, they come on with other window demisters, therefore at low temperatures. I do not think the heat is sufficient to evaporate rain which is generally at higher environmental temperatures.The same priciple applies to both front and rear heated windows for which the rmedy for rain, is obviously the wipers.Brian - East Sussex
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2009 (09) 10MY Discovery 4 HSE
Nara Bronze
Ebony Upholstery
Side steps
Tow bar
Surround Cameras
TV
Full floor mats
Heated steering wheel (!)
26th Jan 2014 4:09 pm
Sloss
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
My Audi A8 would remove raindrops pretty well, you could see the vapour coming off no problem.
The D4 seem very reluctant to remove misting, no real frost so far.... Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
26th Jan 2014 4:18 pm
mse
Member Since: 27 Jun 2005
Location: Shropshire
Posts: 2702
Ive found the mirrors on all the land rovers ive had with them to be great at clearing what they are meant to - frost mist, not rain.Mike
Last edited by mse on 26th Jan 2014 6:12 pm. Edited 1 time in total
26th Jan 2014 6:05 pm
Sloss
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
Thanks gents, however we are getting away from my question:
How is the electric heating triggered?Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
26th Jan 2014 6:10 pm
mse
Member Since: 27 Jun 2005
Location: Shropshire
Posts: 2702
that's easy - its linked to the rear window demister, has for ever... and the washerjet heaters.Mike
26th Jan 2014 6:12 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
Sloss wrote:
How is the electric heating triggered?
This is how they work
Quote:
Exterior Mirrors
Heating
The CJB receives the ambient air temperature value from the ECM (engine control module) on the high speed CAN (controller area network) bus. The CJB converts the ambient air temperature value to an on-time percentage and transmits it on the medium speed CAN bus to the two door modules, which then energize the exterior mirror heating elements accordingly. The on-time percentage is increased while the windshield wipers are on.
Click image to enlarge
On vehicles with the parked heating function, exterior mirror heating may also operate when the parked heating function is active, depending on the ambient air temperature.
Member Since: 27 Jun 2005
Location: Shropshire
Posts: 2702
Im almost certain they come on if you press the heated rear window button in addition to that.
im sure it says that somewhere too.Mike
26th Jan 2014 6:47 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
No they are not connected 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
26th Jan 2014 7:10 pm
mse
Member Since: 27 Jun 2005
Location: Shropshire
Posts: 2702
Im sure there were on the sport - I remember pressing the button to defrost the mirrors in the snow on the sport, same as the sport before and the D1 and D2?
It cant have been a coincidenceMike
26th Jan 2014 7:17 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
They operate independently on the D4
Quote:
Heated windshield switch: Energizes the windshield heater for a set time period, until the switch is pressed again or until the engine stops, whichever occurs first. An amber LED in the switch is illuminated while the heater is on.
Heated rear window switch: Enabled only with the engine running. Pressing the switch energizes the rear window heater for a set time period, until the switch is pressed again or until the engine stops, whichever occurs first. An amber LED in the switch is illuminated while the heater is on.
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
Excellent stuff DG - exactly what I was looking for
I thought it was far too simple to be just directly on with the rear window element.
Clever stuff but more to go wrong...... Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
27th Jan 2014 8:06 am
plug
Member Since: 12 May 2015
Location: Kent
Posts: 3
Ate they on their yfuse then as mine certainly do not work. -2 this morning and windscreen heated nicely but mir dry or still frozen.
24th Feb 2016 10:57 pm
Popelka
Member Since: 31 May 2008
Location: Praha (Prague)
Posts: 2430
on my car (although not a LR product) it's on the mirror controls, ie the same as turn the nob for left or right and then juggle the nob to move mirrors into desired position, also on that nob is position to park the mirror and next point is turn heat on Experience is a difficult teacher, because she gives the test first and then the lesson afterwards!!!!
25th Feb 2016 1:19 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8108
On my D3 I can feel the heat when they are on with my hand, I don't know what switches them on, I just know they work . As for raindrops never noticed any It can when others can't,
It will when others won't,
It goes where others don't.
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