Gotta be either the connector or something wrong in the changer electronics. These changers are the same as used in BMW cars of that era. The head unit will only show the changer in the menu selection if attached. Not attached, no show in the selection menu.I have my 6-CD changer that is not fond by the radio. (2003 LT) Any ideas on troubleshooting check the connections on the unit? It's a replacement unit about two yrs ago.
This radio system works similar to your average computer. It has three phases in its startup and if there is a glitch, crazy fails can happen. To reduce your chances of a fail, get in the habit of shutting your radio down before turning off your bike when you park it, then start radio after full engine startup at your next ride.On my 03 K12LT I disconnected the positive battery cable at the battery and left it disconnected overnight, then reconnected it. This trick worked several times. Never figured out why it quit.