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 NATS IMMU and key switch and key lock solenoid (key switch) connector.
Check continuity between NATS IMMU connector M32 terminal 2 (PU/W) and key switch and key lock solenoid (key switch) connector M64 terminal 4 (PU/W).
1. 2 (PU/W) - 4 (PU/W) : Continuity should exist .

OK or NG

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

Fig 1: Checking Key Switch Circuit

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