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Radio Illumination Signal

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I just replaced my stock head unit with a Sony CDX-F5710 unit. The unit works well but I want to enable the auto dimming feature on the display. The Sony wiring harness has a wire for "car's illumination signal" but the Metra wiring harness does not have a wire an equivalent. I assume this is bacause the stock was an always on LCD but really don't know for sure.

Does anyone have advice for where I could pick up this signal?


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