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2001 focus rear demister fault

Hi. My 2001 focus rear demister has developed a strange fault. The switch and fuse work fine, but the rear screen only clears (demists) in the middle.... And in circles of about 1cm in diameter?! Could anyone please tell me what the problem could be? Many thanks :-)

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You know those little brown lines on the inside of your rear window, they are wires and can get damaged when cleaning your window. get an OHMS meter and you can actually test the lines on your glass and find the damaged sectors, you can get repair kits to do repairs

Posted on Nov 28, 2013

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SOURCE: Ford Focus 2000 - Electrical

Does anything wierd happen like lights lighting dimly when you open the door?

Posted on Jul 18, 2008

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SOURCE: BMW 316i E36 1994, Rear window demister isn't

Check rear demister control relay operation,
Check for presence of 12V power (and ground connection) at rear window heater connection.

Check continuity of the rear window heating element.

Posted on Aug 17, 2009

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SOURCE: Renault Clio Sport 182 Air Con and fan blower fault

I also have a 53 clio with climate control and the fan stopped working. After being quoted £104 by dealership I decided to have a go myself. Bonnet up, remove driverside scuttle cover. Unplug fan resistor 7701051272 (large plug with black wire to fan)remove securing screws and resistor. Dismantled casing and peeled away gel from soldered side of circuit board around mosfet transistor-desolder and remove. Mine was a N342AD 75344G but the nearest I could get was HUF75337P3 from Maplin £1.68. This was the wrong 'package size' but I managed.Close the clamp slightly (before)to hold transistor firmly and then insert transistor and solder. Reassemble. After I got an email from a scrappy QUOTING £20 if you don't fancy the messing about.

image_icon_name.gifIan

Posted on Aug 31, 2009

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I have no power to the fuse that brings power to radio dome light,and rear defogger.How can I get power.


The rear demister requires a large current that is not often available at the switch; in this case an ignition supply tends to be used via the switch to energise a relay which in turn switches a battery supply therefore the circuit often has two fuses.
Sometimes, GM cars especially, the demister switch was fed from the alternator ignition (battery or charging) light to prevent it operating until the engine is running.
For the last decade or sometimes longer it is a computer in the CAN-bus system that switches on such equipment and the switch merely sends a request to the computer to do so.

Regarding faults with late model computerised cars it is unwise to do anything other than check fuses without access to a wiring diagram and even then a person is severely limited without specialised diagnostic equipment. Earlier cars of course can be diagnosed with patience and a test lamp.

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