2004 Buick Rainier Auxiliary Input?

A friend of mine recently purchased a 2004 Buick Rainier. We want to connect and play music from our iPhones on it but we can't find an auxiliary input. There are two headphone jacks on the back that we tried but they don't seem to play our music through the main speakers. We also checked the car's instruction manual but could not find anything regarding where the aux. Input is. There's a button that says 'CD/AUX' but that is all we can find. Is there an auxiliary input for this car, and if there's where is it?

Many cars carry over buttons and parts over from other cars, thus the CD/AUX button, but I'm pretty sure the 2004 Rainier does not have AUX. If you do want AUX, your best option would be to swap out the stereo system. You could get a decent Sony stereo with bluetooth for around 200 to 300 dollars at any Best Buy or any electronics shop.

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