Where is the aux input on a 2004 Chevrolet Impala LS?

The 2004 Chevrolet Impala LS doesn't have a standard auxiliary input jack. The factory audio system relied on either the cassette player (if equipped) or a CD player for external audio input. To connect an external device like an MP3 player, you'd need to use an aftermarket solution, such as:

* Cassette adapter: A cassette adapter plugs into the cassette player and has an input jack for your device.

* FM Modulator: This transmits the audio from your device over an unused FM frequency to your car's radio.

* Aftermarket car stereo: Replacing the factory head unit with a modern stereo that has an auxiliary input is the best option for quality sound and features.

There's no hidden aux input you can find; these are the only ways to connect an external audio source to the factory stereo system.