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E46 Convertible
The E46 vert forum. Talk about dropping your E46 top here.

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Old 01-02-2016, 11:07 AM   #1
Slupe
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Vert Rear Defogger / Defroster help

I cannot get the rear defogger/defrost to work on my 2004 330ci vert. Fuses are good, so I successfully located the two relays located by the passenger side rear seat. I removed and tested both relays by applying 12v and they operated correctly. I don't have a wiring diagram to know which wires run to the rear window, but with the car running and defrost switch on, I was also able to use my multi-meter and got power on all the wires from the relay. I can hear them clicking when turning on the defroster, turning on the car, and click off when I open the top. So, it seems I have power into and out of these relays. Does all of this sound correct?

Is there anything else between the relays and the rear window grid? I assume I should be able to test power to the grid with my multi-meter applying red to either tab on the window and black to ground. Any other suggestions?

Relay pic attached...
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Old 01-02-2016, 12:13 PM   #2
taylor192
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Broken wire? I'm assuming the defroster wires are part of the harness that bends with the top, and we know wires break at the bends.
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Old 01-03-2016, 09:17 PM   #3
CarbonZHP
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For my rear defroster, a single one of the heating coil stripes does not work. Right in the middle of the window. Kills me
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Old 01-05-2016, 01:56 AM   #4
cityjohn
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Originally Posted by CarbonZHP View Post
For my rear defroster, a single one of the heating coil stripes does not work. Right in the middle of the window. Kills me
I used this and it turned out perfect. Just leaves a small wide repaired area but now the heater functions. Use a multimeter to locate the break.

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