If it came with the base system there may be no wiring for Hi Fi.
When you say Alpine do you mean the retro fit kit Alpine Kit for the base system . 2010 cars came with the ampless base system called the stereo system . All US Cars came with Hi Fi before 2010 and after the 9/2010 build of the 2011 models . During these years there was no pre wiring built into the cars as there was between 2006 and 2009.
entry 22 in the above thread is that what your talking about?