2. Check Key Switch Circuit

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.

Remove the key from the ignition key cylinder.
Disconnect the key switch and key lock solenoid (key switch) connector.
Check continuity between BCM harness connector M4 terminal 69 (PU/W) and key switch and key lock solenoid (key switch) harness connector M64 terminal 4 (PU/W).
Continuity should exist.

Fig 1: Checking Key Switch Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 3 .
NG: Repair harness or connector.