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nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

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.

2nd Jan 2023 5:08pm

RFT

Member Since: 13 Nov 2010
Location: Cheshire
Posts: 678

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

2nd Jan 2023 5:29pm

BrickBox

Member Since: 05 Oct 2021
Location: Wales
Posts: 826

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.

2nd Jan 2023 5:50pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17386

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.

2nd Jan 2023 5:55pm

nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

Cheers chaps

Engine running and still no joy

Engine running. Switch pressed. No light on HWS button

2nd Jan 2023 6:44pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17386

Is it factory-fitted or aftermarket?

2nd Jan 2023 8:16pm

KISSMYAURA

Member Since: 13 Jan 2018
Location: KENT
Posts: 45

factory spec?

2nd Jan 2023 8:35pm

nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

Yeah. Factory fitted

2nd Jan 2023 8:36pm

KISSMYAURA

Member Since: 13 Jan 2018
Location: KENT
Posts: 45

is it working, just no switch light? or all DOA?

2nd Jan 2023 9:05pm

nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

Completely dead. Not working at ll

3rd Jan 2023 9:28am

KISSMYAURA

Member Since: 13 Jan 2018
Location: KENT
Posts: 45

is the relay clicking?

3rd Jan 2023 9:33am

nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

No. Nothing when the button is pressed. Switched the relays around as well to test and nothing

3rd Jan 2023 9:33am

KISSMYAURA

Member Since: 13 Jan 2018
Location: KENT
Posts: 45

Click image to enlarge
Could be the realy OR the timer...

3rd Jan 2023 9:35am

KISSMYAURA

Member Since: 13 Jan 2018
Location: KENT
Posts: 45

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!

3rd Jan 2023 9:36am

nick.bw

Member Since: 26 Oct 2020
Location: Essex
Posts: 72

Awesome, thanks. Need to see if i can find a spare one to test.

Thansk

3rd Jan 2023 9:38am

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