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Old 11-08-2009, 03:24 PM   #1 (permalink)
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My rear defroster is not working. It may or may not be related to a terrible experience I had when I had a Body Shop replace the driver's side door after an accident. That experience cause me to lose the ability to control my side mirrors and apparently the trunk light. I'm never going back there again, even if that means I won't have a rear defroster.

I have a Metra aftermarket kit, that worked at one time. It doesn't seem to be working now. I don't hear the familiar click under the dash when I hit the button. I don't know how to test the switch.

How can I troubleshoot this thing? The wiring from the rear glass contacts to Fuse #12 seems to work just fine. I popped that fuse when I put a load on it, by mistake, when testing it. The other fuses, #7 and #9 look good too, however I don't know how to check that big Fuse #9.

Can I just run new wires from the fuse box to my switch? Are there other parts that the wires run through? Could it be that the timer is failed?

Thank you for any help. I have access to a multimeter, and as you can see, I'm not quite good with it yet, as I blew my 10a fuse playing around with it.

Any help would be appreciated!

Thanks.
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Old 11-08-2009, 03:44 PM   #2 (permalink)
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start here:

http://www.popularmechanics.com/how_to_cen...ve/1272291.html
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Old 11-08-2009, 04:20 PM   #3 (permalink)
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Thanks.

I did search the forum already and came across that article.

I'm interested in additional information someone might have on the timer or relay. Where are they?

Any help, especially regarding how my multimeter can help, is appreciated.
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Old 11-08-2009, 07:28 PM   #4 (permalink)
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QUOTE (Vee @ Nov 8 2009, 02:20 PM)
Quote:
Thanks.

I did search the forum already and came across that article.

I'm interested in additional information someone might have on the timer or relay. Where are they?

Any help, especially regarding how my multimeter can help, is appreciated.[/b]
#9 is a relay, not a fuse. If it isn't stuck you can both hear it & feel it click when you push the defroster switch in.

http://www.ehow.com/how_4596906_test-car-relay.html

& here's the diagram for that circuit in a 00 taurus:

[attachment=31296:00_rear_..._diagram.gif]
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File Type: gif 00_rear_defroster_diagram.gif (18.8 KB, 649 views)
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Old 11-09-2009, 01:05 PM   #5 (permalink)
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Excellent. This is a great start for me. All I have to do is recall my EE101 classes, but I think it's making sense.

The underlined C numbers are reference numbers that don't mean anything to me, right?

I don't know what the middle number to the left of the line indicates. C270b starts off of Pin Location 11 and ends at Pin location 7 using a Dark Green/Violet Line wire. What is the 59 telling me?

Does anyone know how to test the rear window defrost relay?

Thanks again for the diagram!

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Old 11-09-2009, 11:35 PM   #6 (permalink)
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QUOTE (Vee @ Nov 9 2009, 11:05 AM)
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Does anyone know how to test the rear window defrost relay?[/b]
Its pretty simple: if it clicks its good. If it doesn't then either its not getting supplied 12v or its bad. And I'll repost this link:

http://www.ehow.com/how_4596906_test-car-relay.html

Reading schmatics is a pretty basic skill set for auto repair...it's hardly EE.
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