2. Check Key Switch (Insert)

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch OFF.
Disconnect key switch and key lock solenoid connector.
Check continuity between key switch and key lock solenoid connector terminals 3 and 4.

Fig 1: Continuity Chart

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Continuity

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK >> GO TO 3.
NG >> Replace key switch and key lock solenoid.