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Discussion Starter · #1 ·
Last week i purchase used 2009 Sonata, with Infinity audio system. Unfortunately no documentation for the system provided. When I try to set the AM and FM channels, they revert back to former channels the next time I start the car. For example, if I try set FM 99.9 for preset channel #4, the next day or next time I drive, #4 will revert back to whatever it was before.

So how do you set these channels?
 
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