WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
(X209) LEFT INSTRUMENT PANEL (I/P) SPEAKER (+) CIRCUIT OPEN
(X299) LEFT INSTRUMENT PANEL (I/P) SPEAKER (-) CIRCUIT OPEN