DICE Electronics DICE interface for iPod Honda - Manual (Page 13)

Honda R2 BUS connector
13
Reconnect all the other harnesses as they were if removed. External CD changer cannot be used together with the integration kit.
4 You can access the CD changer connector located on the back of the radio. If the factory CD changer is connected,
unplug it and plug the vehicle specific cable into the receptacle. The connector should securely lock.