Code Entry as Follows:

Switch ON the Ignition (No need to start car)
Switch Radio On - Display Shows
" CODE " Flashing
Press And Hold " DISP/Auto-M " And Preset " 6 "
The Display Will Show " - - - - "
Press preset " 1 " repeatedly for 1st Digit
Press preset " 2 " repeatedly for 2nd Digit
Press preset " 3 " repeatedly for 3rd Digit
Press preset " 4 " repeatedly for 4th Digit
If the correct code number is now shown
Press And Hold " DISP/Auto-M " And Preset " 6 "
The Display Will Slowly Flash "CODE"
And the Radio will then Turn On