WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Check continuity between terminals of the key switch and key lock solenoid.
CONNECTOR TERMINAL CONTINUITY SPECIFICATION
Condition
Terminal No.
Continuity
Key inserted
3 - 4
Yes
Key withdrawn
No
Fig 1: Identifying Continuity Between Terminals Of Key Switch And Key Lock Solenoid