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Old 05-12-2013, 05:43 PM   #23
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My Ride: '99 323i & '02 540i
Pictorial Guide to buying BMW Business CD53 Alpine Radios that play MP3 Data CD

Originally Posted by mattman928 View Post
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).
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).

Last edited by scottjoh; 05-12-2013 at 05:46 PM.
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