heated windscreen

Saint.V8 · Dec 14, 2012

gold rover said:
Are we sharing a veh? We have the same CD changer issue and the same windscreen

Seems like it, but then again they are Range Rovers....

Everyone moans about build quality....but if you ask me, the factory are spot on as everyone has the exact same failures, so it is not the build that is questionable, it is the parts quality and the design!!!

Datatek · Dec 14, 2012

paulvasey said:
would a continuitey test with a multimeter work on the screen? or will the element be too fine?

You can test it with an ohm meter. Electric screens are a 5 minute wonder, they all fail as soon as the manufacturers warranty expires if not before.
Mines a P38 but it's the same, I have an 1" wide strip on the passenger side and a half inch on the drivers side.
Waste of time IMO, I just start the car 5 minutes before I go out and it's ready to go and warm. I realise that this is not a viable option for those of you with gas guzzling V8's

Datatek · Dec 14, 2012

Saint.V8 said:
Seems like it, but then again they are Range Rovers....

Everyone moans about build quality....but if you ask me, the factory are spot on as everyone has the exact same failures, so it is not the build that is questionable, it is the parts quality and the design!!!

LR buy their parts to a price not to a quality standard

paulvasey · Dec 14, 2012

i have ohms on my meter what would be the procedure? sorry electronics arnt really my area

paulvasey · Dec 14, 2012

ok, just opened the box under the bonnet to find the relay expecting a nice laid out box with a diagram like the p38. noowhat a mess anyone know which relay is the windsreen heater?

Saint.V8 · Dec 14, 2012

Heated Screen Relay is behind the Dashboard side fascia....the only referenec I have says Drivers side...but the piccy looks like it is from a LHD car....so it is either behind the passanger side dash side fascia or the drivers...

As attached.....so put the top back on the Engine ECU box!!!

paulvasey · Dec 14, 2012

ahh i see, that will have to wait till tommorrow then

Datatek · Dec 14, 2012

paulvasey said:
i have ohms on my meter what would be the procedure? sorry electronics arnt really my area

Disconnect the screen, meter on 1K ohms or thereabouts and see if you get continuity.

Then put the meter on DC 20 volts and put it across the wires or wire to chassis, switch the heater on and see if you get 12 volts.

paulvasey · Dec 14, 2012

cheers datatek, at the risk of sounding like an idiot, my multimeter as an audable continuity setting, will this not also do it?

2.0_hippo · Dec 14, 2012

paulvasey said:
cheers datatek, at the risk of sounding like an idiot, my multimeter as an audable continuity setting, will this not also do it?

You need the measurement readout... IE ohms

Audible continuity won't do the job

paulvasey · Dec 14, 2012

i see, is there any particular reading im looking for? or just any sort of reading at all?

Saint.V8 · Dec 14, 2012

Something that isn't a zero or no reading!!!

paulvasey · Dec 14, 2012

ha ok, gottcha

paulvasey · Dec 15, 2012

ok , looks like its the screen after all. got 12v at the screen, but no change in reading on ohms test. stayed at 1 which i presume is an infinate reading which i should get?

Saint.V8 · Dec 15, 2012

paulvasey said:
ok , looks like its the screen after all. got 12v at the screen, but no change in reading on ohms test. stayed at 1 which i presume is an infinate reading which i should get?

Sounds like the screen to me...not sure what the Ohms should be...can be worked out from the fuse rating 30A which also runs the Heated Jet Washers....0 reading is continuity and no resistance, 1 reading is open circuit

So lets say an 80% capacity = 24A at full load

2/3rds for the HFS = 16A

Resistance = Volts / Amps

= 0.75 Ohms

(all figures are VERY approximate - need to know the true current draw of a fully working heated screen I just guessed)

paulvasey · Dec 15, 2012

i see. i think. so as my screen reading is 1 ive got an open circuit which means broken element , right?

paulvasey · Dec 15, 2012

on another point, im suprised the light stays on, if the circuit is broken should it not go out after a few secs? and shouldnt it log an open circuit fault? oh and for referance the relay is passenger side , i can hear it switching over.

Datatek · Dec 15, 2012

paulvasey said:
i see. i think. so as my screen reading is 1 ive got an open circuit which means broken element , right?

Your 1 reading would depend on what ohms range you have selected, if you have selected a 10 ohms range a reading of 1 might be correct. Open circuit on my cheapo meter is 9999 and 0.0 for a short circuit.

paulvasey · Dec 15, 2012

i selected 2k is this 20 ohm? im guessing. i get a reading of 1 when i turn it on ,if i touch th probes together i get 0.00

2.0_hippo · Dec 15, 2012

2 mega ohm / 2,000 ohms

heated windscreen

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