Connect a CCU-TX50 to a Telex intercom | Discrete Cosine Aug 07, 2007I contacted Sony and was able to get a White Paper titled: Connecting Intercom to the SONY CCU. It has detailed information about connecting to the CCU-TX50 intercom and setting the proper dip switches on the AU-300 board. I have placed some of the relevant information below but do not have a good way to host the PDF file. sony car stereo wiring harness | eBay Sony Wiring Harness Car Stereo 16 pin Wire Connector See more like this. Sony CD Car Stereo Radio Kit Dash Installation Mounting With Wiring Harness. Brand New. SONY 9 Pin Wiring Harness SONY Car Stereo WIRING HARNESS SONY Harness. Brand New. $8. FAST 'N FREE. Buy It Now. Guaranteed by Mon, Apr. 22.