Telephone Mute wire in 03 Escalade

[BulldogSr04 10+ year member]

I am installing a Bluetooth Wireless Adapter into my dad's 2003 Escalade. It has Navigation and Onstar. I am looking for an "Entertainment Mute Wire" to tap into. If somebody could point these out to me, I would be greatly appreciative as I am not familliar with the wiring schematics of this vehicle.

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