I need to decode my Clarion PU9679A radio but can't seem to get to the mode that asks for the code When I switch on the unit, it displays "SECURITY" and does not give me the option to enter the code. I tried leaving the ignition on for 2 hrs but did not work.

I also tried pressing the "on" button while simultaneously holding down the Band key. This allows the radio to play for 2-3 mins (there is a steady beeping sound in the background) and then it goes back to "SECURITY" mode.

H ELP !!