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Heated windscreen issue
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4
Heated windscreen issue

It’s that time of year and when I need it most the heated windscreen is playing up. The passenger side works ok but the driver side will not clear at all. Last year I had one of maybe two small strips on the driver side which were slow to clear but not all of it. I have changed the fuses FL2 and FL6 and it has no effect. I do not have any serious chips in the windscreen so doubt a broken filament is the issue. Can anyone suggest what else I should look at.
Thanks
  
Post #23547502nd Dec 2023 2:20 pm
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jenseneverest
 


Member Since: 12 Jun 2017
Location: somewhere
Posts: 769

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Manual Zambezi SilverDiscovery 3

Take the internal A pillar trim off, (be careful there is an airbag in there)
there is connections both N/S and O/S, check they are both making good contact.
Sounds like the filament is failing to me though Crying or Very sad
  
Post #23547582nd Dec 2023 4:10 pm
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4

Thanks for the steer and I will have a look at it tomorrow. I assume taking the A pillar off is straightforward by removing the airbag plastic cover and taking the screw out. I fear you are probably right and the filament is failing
  
Post #23547602nd Dec 2023 4:28 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10734

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

you should only need to take the A pillar off the drivers side.

Torx driver required.

There should be 2 flat connectors.
One + one -

Turn on the engine and windscreen and ensure 12v across them.
  
Post #23547612nd Dec 2023 4:35 pm
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4

Looking at it again this morning I notice there is a relay in the fuse box which indicates it is for the heated screen. Am I right in assuming that if this had failed neither side of the screen would work. Is it possible to get these from any car shop or is it a stealer job 😩
  
Post #23550465th Dec 2023 1:14 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8243

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

Follow Pete’s instructions, use a 12v bulb to test for power if you do not have a proper tester Thumbs Up
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #23550565th Dec 2023 2:44 pm
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4

I will look tomorrow when it is dry. Are the connections to the screen easily identifiable or can anyone tell me where they are
Thanks for all the help
  
Post #23550905th Dec 2023 7:41 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4537

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Quite obvious, about half way up the pillar, both sides. Black wires (I think) with spade type connectors on. The flat terminals come off a flat flexi bonded to the screen.
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #23550915th Dec 2023 7:56 pm
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4

Thanks
  
Post #23550945th Dec 2023 8:13 pm
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Steve B
 


Member Since: 04 Dec 2010
Location: Yorkshire
Posts: 263

England 2012 Discovery 4 3.0 TDV6 XS Auto Fuji WhiteDiscovery 4

Well a sunny day at last so I managed to get out to the car.

I have taken the A pillar off and found the two bonded bits to the windscreen (see photo ). I have put a multimeter on each and get no reading.

The screen is on closer examination clearing very slowly compared to the other side so some current must be getting through. The wiring and spades are very difficult to get to with all the wiring and I am concerned I may set the airbag off by moving it all around.
I did take the other side A pilllar off and have noticed that the bonding pieces are fixed to the screen better than the driver side.

A couple of questions :

Could the issue of slow clearing be as a result of the bonding not being as good as the passenger side ?

Should I get a reading of the bonding pieces or do I need to disconnect the spades

Thanks again for your help
  
Post #23551446th Dec 2023 1:55 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8243

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

You won’t set the air bag off, if you can’t get a reading from the bonding take them off and test the spades, it is always better to use a load like a 12v bulb, a tester with a built in bulb can be obtained for £3-£4 Thumbs Up
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #23551656th Dec 2023 6:44 pm
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