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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
Heated Windscreen Switch = No Light
Hi all

Having a nightmare troubleshooting this issue.

Car has ignition on but when I press the heated windscreen, I do not get a light on the switch.

I have also moved the relays about to try and troubleshoot under the steering wheel and the relays look to be working.

Any ideas on what to next try?

Thanks
Nick.
Post #976403 2nd Jan 2023 5:08pm
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RFT



Member Since: 13 Nov 2010
Location: Cheshire
Posts: 678
United Kingdom 2010 Defender 130 Puma 2.4 HCPU Zermatt Silver
I suspect you need the engine running, relay will take alternator voltage signal. 130 Puma HCPU with an Artica 240LR Demountable Camper
Post #976406 2nd Jan 2023 5:29pm
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 821
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
I believe it only works with the engine running. 2008 2.4 110 Utility Station Wagon XS.
Post #976408 2nd Jan 2023 5:50pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17382
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
As above, the HFW requires the engine to be running in order to work. The is.an "engine running" signal from the IPAC which is used for this purpose (which if I remember is actually dependent upon the alternator providing an output which means the engine is running).

Start your engine and repeat your test, let s know how you get on.
Post #976409 2nd Jan 2023 5:55pm
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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
Cheers chaps

Engine running and still no joy

Engine running. Switch pressed. No light on HWS button
Post #976421 2nd Jan 2023 6:44pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17382
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Is it factory-fitted or aftermarket?
Post #976442 2nd Jan 2023 8:16pm
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KISSMYAURA



Member Since: 13 Jan 2018
Location: KENT
Posts: 45
United Kingdom 2003 Defender 90 2.5 TD SW Epsom Green
factory spec?
Post #976446 2nd Jan 2023 8:35pm
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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
Yeah. Factory fitted
Post #976447 2nd Jan 2023 8:36pm
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KISSMYAURA



Member Since: 13 Jan 2018
Location: KENT
Posts: 45
United Kingdom 2003 Defender 90 2.5 TD SW Epsom Green
is it working, just no switch light? or all DOA?
Post #976461 2nd Jan 2023 9:05pm
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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
Completely dead. Not working at ll
Post #976494 3rd Jan 2023 9:28am
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KISSMYAURA



Member Since: 13 Jan 2018
Location: KENT
Posts: 45
United Kingdom 2003 Defender 90 2.5 TD SW Epsom Green
is the relay clicking?
Post #976495 3rd Jan 2023 9:33am
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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
No. Nothing when the button is pressed. Switched the relays around as well to test and nothing
Post #976496 3rd Jan 2023 9:33am
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KISSMYAURA



Member Since: 13 Jan 2018
Location: KENT
Posts: 45
United Kingdom 2003 Defender 90 2.5 TD SW Epsom Green

Click image to enlarge
Could be the realy OR the timer...
Post #976497 3rd Jan 2023 9:35am
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KISSMYAURA



Member Since: 13 Jan 2018
Location: KENT
Posts: 45
United Kingdom 2003 Defender 90 2.5 TD SW Epsom Green
The switch light (AKA tell tail) is wired to the timer, so if the timer is duff you will not get a light oin the switch, the realy may still work but the timer may not be actuating!
Post #976498 3rd Jan 2023 9:36am
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nick.bw



Member Since: 26 Oct 2020
Location: Essex
Posts: 72
United Kingdom 2014 Defender 110 Puma 2.4 XS CSW Santorini Black
Awesome, thanks. Need to see if i can find a spare one to test.

Thansk
Post #976499 3rd Jan 2023 9:38am
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