I've installed a new aftermarket head unit, but there is no sound when I play CD's.
This is a very common occurrence, and is quite simple to remedy.
On the back of your new head unit you will most likely have a blue wire and a blue/white stripe wire in the radio harness. You likely connected the blue wire to the blue wire in the aftermarket BMW harness. This blue wire only provides 12 volts when the radio is on, as it actually a power antenna wire. The blue/white stripe wire is an amplifier turn-on wire, and it provides 12 volts whenever the radio is turned on.
So, the simple resolve is to swap the blue wire from the back of your radio with the blue/white stripe wire as it connects to the blue wire in the aftermarket BMW harness.
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