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Old 12-22-2009, 05:32 PM
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I just went and looked at an '04 we have in the shop and if your rear defrost is on relay #68 then we're in business. The relay control is tied into the mirrors already and all you should need to do it obtain a relay and splice into the DB/WT wire, hook that to one side of the grid and ground the other. I have a feeling that since you didnt find any wiring for the grid already in place, that it leaves the relay and terminates at C136. You shouldn't need to worry with a fuse either if fuse 26 supplies power to the 30 terminal.
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