2013 BMW X3 No sound, no audio fix repair Amplifier location and fusebox location 

2013 BMW X3, The first thing you should check is check all fuses behind the glove box and the passenger side at the trunk .open the panel on the driver side trunk . unplug the fiberoptic cable to see if you have red light with key on. check power at the red/blue wire at the amplifier
if the power is missing do like our fix.
if no laser led at the amplifier, youmay have defective radio
how to repair idrive is here
• BMW Idrive controller ...