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What is this, please.
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ronp
 


Member Since: 29 Nov 2006
Location: 🌲🌲Galloway🌲🌲
Posts: 13498

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
What is this, please.

Not got around to finding out everything in my new[to me] MY14 D4.

But just about to wire in my Blackvue I became aware of the unit in the pic.
It's sighted at the top of the windscreen, behind the mirror, drivers side.
Looking at the cut out for the cable on the headling, I don't reckon it's a oem unit.
Anybody got an idea what it is please? Thumbs Up

Click image to enlarge
 🌲🌲in the forest🌲🌲

Selling some stuff:
Short roof rails
DISCOVERY gloss black Bonnet Lettering for D4/D3
DISCOVERY gloss black Bonnet Lettering for D5
Brodit 'active' adjustable iPhone cradle [for iPhone 5, 6 on]

PM if anything of interest 
 
Post #206207718th Jun 2019 3:59 pm
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BBDisco3
 


Member Since: 23 Nov 2008
Location: Cheshire
Posts: 3235

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Indus SilverDiscovery 4

It is original - been mentioned on here before but I've forgotten what it is Thumbs Up
  
Post #206208618th Jun 2019 4:27 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
Posts: 24613

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Lux Auto Fuji WhiteDiscovery 4

It’s a humidity sensor.
  
Post #206209318th Jun 2019 4:43 pm
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ronp
 


Member Since: 29 Nov 2006
Location: 🌲🌲Galloway🌲🌲
Posts: 13498

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

Thanks Gareth [& BBDisco3 to a lesser extent Laughing ]. Thumbs Up

So is it OEM?

And what really is the purpose of it [ok, I know ... to sense humidity], but what is triggered when humidity is sensed?
 🌲🌲in the forest🌲🌲

Selling some stuff:
Short roof rails
DISCOVERY gloss black Bonnet Lettering for D4/D3
DISCOVERY gloss black Bonnet Lettering for D5
Brodit 'active' adjustable iPhone cradle [for iPhone 5, 6 on]

PM if anything of interest 
 
Post #206209618th Jun 2019 5:02 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 5180

England 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

if it decides you are too sweaty, it unlocks your seatbelt and opens the door. Whistle
  
Post #206209818th Jun 2019 5:03 pm
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ronp
 


Member Since: 29 Nov 2006
Location: 🌲🌲Galloway🌲🌲
Posts: 13498

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

All sorted now. Thumbs Up

Did a search and there are quite a number of threads asking the same question.
eg https://www.disco4.com/forum/gizmo-176382....ity+sensor

Quote:
With a humidity sensor fitted, the ATC module controls the moisture content of the air in the vehicle. This is achieved by raising the evaporator temperature to increase the humidity of the air entering the vehicle, and reducing the evaporator temperature to reduce the humidity of the air entering the vehicle.


I should've hit the search button before posting. Rolling Eyes
 🌲🌲in the forest🌲🌲

Selling some stuff:
Short roof rails
DISCOVERY gloss black Bonnet Lettering for D4/D3
DISCOVERY gloss black Bonnet Lettering for D5
Brodit 'active' adjustable iPhone cradle [for iPhone 5, 6 on]

PM if anything of interest 
 
Post #206210518th Jun 2019 5:24 pm
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promitheus
 


Member Since: 04 Jul 2009
Location: Afidnes, Greece
Posts: 570

Greece 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

As said, it's the front windscreen humidity sensor.

After spending months back on 2014-15 to figure our why my air intake flap would not completely close during winter days, allowing vehicle exhaust fumes to enter the cabin during rash hour no matter how I setup the climate controls, it turned out that it was the humidity sensor that would seldom allow the flap to completely close. LR could not figure out how it worked either, sending emails to LR trying to figure this out. Finally I used my IID Tool to observe how it worked and the logic behind. Ordered a second sensor just in case the original was broken, but the flap would almost never close (except in summer or sunny days).

To keep a long story short, vehicles fitted with the humidity sensor will not completely close the air intake flap if humidity sensor reading is above 35-40%, however it takes into account things like outside temp, internal temp etc.
  
Post #206308422nd Jun 2019 10:17 am
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