Wiring Harness Information | Sony USA Be among the first to get the latest Sony news in your inbox. Sony Support CDX-GT40U. Article ID : 00028632 / Last Modified : . Wiring Harness Information. Applicable Products and Categories of This Article. Select the appropriate wiring harness to view a table showing the wire color and function of each pin: 9-pin wiring harness ; What is the wire color and function of each pin - sony Sony Support CDX-GT40U. Article ID : 00025258 / Last Modified : . What is the wire color and function of each pin on the 9-pin wiring harness? The wired remote control for my car stereo is not working. Information about installing a Sony car stereo or mobile audio system.