WARNING: This page is about a different car, the 2013 Dodge Avenger and 2013 Chrysler 200. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
(X304) AMPLIFIED RIGHT REAR SPEAKER (+) CIRCUIT SHORTED TO VOLTAGE
(X394) AMPLIFIED RIGHT REAR SPEAKER (-) CIRCUIT SHORTED TO VOLTAGE