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Electronics In Car Entertainment (ICE), Sat-Nav, lighting, wiring etc.

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post #1 of 4 (permalink) Old 9th November 2006 Thread Starter
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Heated rear window problem ?? I can switch it one and the switch illuminates as if its ok but the rear window element is not working, Iv'e checked the fusebox and fuses seem ok the conectors on back window seem ok, I'm stuck anyone got any ideas
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post #2 of 4 (permalink) Old 10th November 2006
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post #3 of 4 (permalink) Old 10th November 2006
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Firstly,what car have you got?

Secondly,you need to see if you have 12 volts going to one side of the window and an earth the other side.If not,then it could be broken wires where loom goes through from the headlining to the tailgate(by the hinges).

It is also for the window elements to become damaged,so have a close look at them to see any gaps or tears in them.

I'd rather push my Alfa than drive a BMW....
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post #4 of 4 (permalink) Old 10th November 2006
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Using a multimeter, check the voltage at both terminals on the rear window with respect to a known good ground on the car body (the tailgate striker plate is probably a good bet.) One contact should read somewhere between 12 and 14 volts, while the other should read less than 1 volt.

There's a few possible outcomes here:
1) You don't find any voltage on either contact: The circuit is broken somewhere. If the light is working on the switch then it's unlikely to be the switch or the fuse, but it could be a break in the wiring elsewhere.
2) You can find less than 1 volt on one contact, but a low voltage (less than, say, 9 volts) on the other. You have high resistance somewhere in the circuit, but definitely no actually broken wires. Unfortunately this could be just about anywhere, but at least you've narrowed things down a bit.
3) You can find 12-14 volts on one connector, but the other is showing greater than 1 volt - you have a bad earth on the tailgate wiring. You can either fix this properly, or bodge it with a wire link running from the tailgate to the car body.
4) You can find 12-14 volts on one connector and less than 1 volt on the other - either the heated rear window element is faulty, or one of the connectors is not making a good contact with the element.

Grab a multimeter and give that a shot. If you're still stuck after finding the results, then let us know
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