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According to this, pin 6 in the yellow connector is "Radio Code In". In the ACC ignition position, this wire is at just under 12 V, indicating I guess that the radio should ask for the code when plugged in again.
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This is more than likely the switched power lead you are looking.
I don't believe it asks for a code, rather than a 12V trigger to the radio to present code on the display.
The code is internal to the radio set by Becker matching the model and serial number to the radio code.