alirz: It might be that the blue wire that triggers the factory amp to power on might not be sending a strong enough signal for your BMW. Do not worry there is a simple solution for this. I have emailed you the step by step guide how to fix this and soon you will have sound working from all of your speakers. Please check your email for the instructions.
Last edited by email@example.com; 05-10-2014 at 05:13 PM.