2. Press and hold the "Tuner" button for at least 5 seconds.
3. The display will read "Unlock RDS."
4. Enter the unlock code using the radio preset buttons.
* Each button press increases the current digit's value *(0 through 9)* or changes letters *(a and b only)*. Press the button repeatedly to reach the desired digit
5. Press ENTER
If the code was invalid the display says 'Wrong!' for two seconds. Re-enter code from the beginning. If the right RDS unlock pin was entered the display blinks RDS 4 seconds and displays 'RDS On" for several seconds.