Clarion NZ502E Owner's Manual & Installation Manual page 51

When the Anti-theft is "On", you need enter correct
Anti-theft code to turn the unit on. If you enter wrong
code three times, the unit is locked, and must be
unlocked by the professionals.
2. If your unit is secured, hold the [
then 2 seconds, then the Anti-Theft setting mode will
display. The numerical keypad is displayed, enter the
right code to unlock.
50 NZ502E
] more