I have a 2011 suburban with factory nav and bose sound system. I had a sub box added and a amp to drive the two subs. My problem now is that when i put they car in accesory mode only the center dash speaker plays, can anyone let me know what is going on. thanks

 

Welcome to the forum

Did you do the work or was it done for you? I'd say take it back if you had it done...
Otherwise I would check to see if the amp is powering up with key in ACC position... the pre-amp connections could be connected up wrong and the output to the other speakers is only enable when the amp is on...

my 2 cents....