Rear Screen Demister

For all electrical questions; Alternators including fitment; Light connections/wiring; Instruments; Gauges; MFA; Heater blower (not coolant related) issues etc etc.

Moderator:Scirocco Register

Forum rules
Hints, tips and guides for repair and modification - the FAQ section on the main website is worth checking first for information relating to common faults and technical help. Useful posts and guides will be added to the FAQ http://www.sciroccoregister.co.uk/scirocco-faq
RussGLAuto
Posts:182
Joined:Sat Jul 14, 2018 11:51 pm
fill in the right answer:15
Location:Spalding
Rear Screen Demister

Post by RussGLAuto » Sat Mar 06, 2021 6:54 pm

Evening gents,

On these cold misty mornings, one thing that has eluded my otherwise gremlin free electrical system is the rear screen demister.

I have replaced the switch, the little light even comes on in the switch is on, so it's getting power. All connections seems sound (!) and I can't find any fuse related item to check on the fuse box. Odd...

Looking at all the window tracks, well, they seem to be in unbroken order, no obvious scratches through them that would cut the circuit.

Any ideas on what to check please?

Cheers

Russ


Daily Driver - 2017 Volvo XC90 T8 Twin Engine - Polestar - Arctic White
Weekend Wagon - 50k 1982 Mk2 Scirocco 1.6 GL Auto - Diamond Silver
Other Half's Wagon - 2008 Mazda 2 1.5 Sport - Cosmos Blue
Daughters Curb Scraper - 2016 Fiat 500 1.2 - White

GT_II
Posts:318
Joined:Fri Feb 24, 2017 12:18 am
fill in the right answer:15
Location:Warwickshire

Re: Rear Screen Demister

Post by GT_II » Sat Mar 06, 2021 11:34 pm

Broken wires where they pass through to the tailgate? Do you have a working rear wiper? If so, the fault is likely in the live feed to the heater. Otherwise it could be a broken earth wire.


1992 VW Scirocco GT II 1.8 90PS Brilliant Black 30k
2011 VW Caddy Van C20 Startline 1.6 TDI 102PS 60k
2015 Skoda Yeti SE Outdoor 1.2 TSI DSG 105PS 30k
2013 Fiat 500 Pop 1.2 69PS 40k
2009 VW Fox 1.2 54PS 60k
2009 Smart Fortwo Passion 1.0 mhd 71PS 25k

RussGLAuto
Posts:182
Joined:Sat Jul 14, 2018 11:51 pm
fill in the right answer:15
Location:Spalding

Re: Rear Screen Demister

Post by RussGLAuto » Sun Mar 07, 2021 10:19 am

Yes, the rear wash wipe is working fine.

I'll check if I'm getting power at the window element end, better get myself a multimeter!

If it is the element I guess I'm stuffed?


Daily Driver - 2017 Volvo XC90 T8 Twin Engine - Polestar - Arctic White
Weekend Wagon - 50k 1982 Mk2 Scirocco 1.6 GL Auto - Diamond Silver
Other Half's Wagon - 2008 Mazda 2 1.5 Sport - Cosmos Blue
Daughters Curb Scraper - 2016 Fiat 500 1.2 - White

mark1gls
Posts:3674
Joined:Thu Apr 02, 2009 9:28 pm
fill in the right answer:10
Location:Somerset

Re: Rear Screen Demister

Post by mark1gls » Sun Mar 07, 2021 9:32 pm

9 times out of 10 it’s a broken wire from where the boot lifts up and down.


Mk1 78 Scirocco GLS 1.6 FR, weekend toy.
Mk1 88 Golf GTi cabriolet 1.8 DX. Daily drive.
Membership No. 323

RussGLAuto
Posts:182
Joined:Sat Jul 14, 2018 11:51 pm
fill in the right answer:15
Location:Spalding

Re: Rear Screen Demister

Post by RussGLAuto » Mon Mar 08, 2021 8:54 am

Many thanks, I'll check that too.


Daily Driver - 2017 Volvo XC90 T8 Twin Engine - Polestar - Arctic White
Weekend Wagon - 50k 1982 Mk2 Scirocco 1.6 GL Auto - Diamond Silver
Other Half's Wagon - 2008 Mazda 2 1.5 Sport - Cosmos Blue
Daughters Curb Scraper - 2016 Fiat 500 1.2 - White