Self-diagnosis Mode

Press the "BACK" switch and the "UP" switch of the 8-direction switches within 10 seconds after turning the ignition switch from OFF to ACC and hold them for 3 seconds or more. Then the buzzer sounds, all indicators of the preset switch illuminate, and the self-diagnosis mode starts.
The continuity of each switch at the ON position can be checked by pressing the switch. The buzzer sounds if the switch is normal.

NOTE: The hazard switch and disk eject switch cannot be checked.

Fig 1: Locating AV Control Unit "BACK" And "UP" Switch (Self Diagnosis Mode)

Courtesy of NISSAN NORTH AMERICA, INC.