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The yellow wire must be directly connected to an always ON B+12 such as the + terminal of the battery. This wire is responsible for providing power to the memory.
Hope that this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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If you are looking for harness details, click Sony Support to download installation manual for CDX-GT310 that has info of each connecting wires and if thats not what you are asking then let me know in details to provide you info. Thanks.
The radio was installed incorrectly or the memory wire has somehow been disconnected. The memory wire is the one which is connected to a permanent 12v feed even when the ignition is turned off.
The permanent feed is usually red, the memory feed is usually yellow (and a poor/lazy fitter may have piggy-backed it onto the red wire). Just connect the yellow to a fused permanent 12v source:either direct to the battery/starter motor terminal, or you can find others attached to the hazard flashers and often to the brake light switch on the pedal assembly.
Do yourself a big favour when doing the job and avoid clip on Scotchlok wiring connectors: they're a constant source of faults and no substitute for proper crimp-on bullet/spade connectors.
* Connect Yellow wire to continues power ( it is back-up power to memory circuit) * Connect Red wire to switched power You can download User Manual and Installation Guide for CDX-S2000 from Sony Support for more information.
Called a shop in VA and their opinion was that the tuner section of the unit failed. Cost of the part, $80. Then, labor and shipping. I can buy the new model (GT320) for about $95. I opted for buying a new unit.
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