The KD-S13 as far as I can remember is similar to the 15, if indeed it is this is the procedure. I will see if I have a manual for the S15 and if so will send it as a PDF format file. Set clock on KD-S13. Hold SEL Button. Select item with up and down rectangular button on the right side of radio. Set or adjust with volume knob. Push SEL when finished.

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