Pictorial Guide to buying BMW Business CD53 Alpine Radios that play MP3 Data CD
That won't work! The HU needs to be able to communicate with the CD changer over the K-bus. It does not sense the CD changer by a resistance between the two inputs like the Aux input does. If you had a CD changer and left the digital lines connected and tapped into the analog signal lines this would work (resistor would not be necessary).
Originally Posted by mattman928
I tried to build the aux and input cable into the CD changer input, but no success. To tie into the input for the CD changer, I spliced into the cd changer harness wire that goes to the trunk, and used the cap/res (2x 0.22uF capacitors and 1x 300k Ohms resistor) to trick the unit into believe there is an input, but when I press the MODE button (I have an alpine unit s/n ending in 072), but had no success (got the "No CD" message, which I think is from the internal player not the changer).
Last edited by scottjoh; 05-12-2013 at 05:46 PM.