Nissan Maxima Owners Manual: Answer back horn feature
If desired, the answer back horn feature can be deactivated using the Intelligent Key. When it is deactivated and the LOCK button is pushed, the hazard indicator lights flash twice.
When the UNLOCK button is pushed, neither the hazard indicator lights nor the horn operates.
If you change the answer back horn and light flash feature with the Intelligent Key, the vehicle information display screen will show the current mode after the ignition switch has been cycled from the OFF to the ON position. The vehicle information display screen can also be used to change the answer back horn mode.
To deactivate: Press and hold the and buttons for at least 2 seconds.
The hazard indicator lights will flash three times to confirm that the answer back horn feature has been deactivated.
To activate: Press and hold the and buttons for at least 2 seconds once more.
The hazard indicator lights will flash once and the horn will sound once to confirm that the horn beep feature has been reactivated.
Deactivating the horn beep feature does not silence the horn if the alarm is triggered.