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The 2005 BMW 645CI does not come with a built-in working AUX input. Some owners have found success by having dealers add one, but this can be pricey, ranging from $900 to $1,000 for parts and installation. Customizing the 645CI can be challenging, and there aren't many aftermarket options for adding an AUX input available. Some owners opt for an Android and iPhone music adapter to play music from their smartphones through the car's radio. Despite the lack of an AUX input, the 645CI boasts 8 speakers, an AM/FM radio, a single CD player, 2 subwoofers, and a leather steering wheel with Audio and cruise control buttons. It can seat up to 4 people, has 325 HP, and gets 15 mpg in the city and 23 mpg on the highway.
The auxiliary input for the 2005 BMW 645ci can be found within the center armrest console.