I found a PDF file of the operations manual for the 2006 Harman/Kardon Advanced Audio System on Iron Cross Audio, an online Harman/Kardon repair house. Hope helps.
Here is the link:
ironcrossaudio.com/Harley_manual.pdf See Figure 1 for a picture of the stereo receiver front panel.
Set Time-of-DaySet the time-of-day with the Ignition/headlamp Key Switch turned to IGNITION or ACCESS but with the stereo receiver OFF.
Press the Set soft key (6) (Set) on the front panel to display the time setup menu.
See A in Figure 4. To increase the hours in the display press the Hrs+ soft key. To decrease hours press the Hrs- soft key.
When the hour is correct, release the soft key.
To increase the minutes in the display press the Min+ soft key.
To decrease minutes press the Min- soft key. When the minute is correct, release the soft key.
Turn Receiver ON/OFFTo turn the receiver ON, turn the Ignition/headlamp Key Switch to IGNITION or ACCESS and press the ON button on the front panel. To turn the receiver OFF, press the ON button.
If the receiver is ON when the ignition is turned OFF, the receiver will power up when the Ignition/headlamp Key Switch is turned to IGNITION.
Good luck.