Self-diagnosis Mode

Press the "BACK" switch and the "UP" switch of the 4-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: Pressing Back And Up Switch
Courtesy of NISSAN MOTOR CO., U.S.A.