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In a 2004 GMC Envoy, you can find the AUX input situated on the dashboard near the bottom of the center console beneath the climate controls. This allows you to play audio from various devices like laptops, MP3 players, and smartphones. If you encounter issues with the Aux not functioning properly, common causes could include a wiring harness short or fault, a blown fuse, or a malfunctioning Aux switch/relay. Moreover, ensure that the Aux input is securely plugged into the device; otherwise, you may experience muted sound through the speakers.
In a 2004 GMC Envoy, you can find the auxiliary input on the dashboard. Just search for the 3.5mm audio jack.